Cover - USD ($) $ in Billions	12 Months Ended
Cover - USD ($) $ in Billions	Dec. 31, 2019	Feb. 06, 2020	Jun. 30, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-36373
Entity Registrant Name	TRINET GROUP, INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-3359658
Entity Address, Address Line One	One Park Place,
Entity Address, Address Line Two	Suite 600
Entity Address, City or Town	Dublin,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94568
City Area Code	510
Local Phone Number	352-5000
Title of 12(b) Security	Common stock par value $0.000025 per share
Trading Symbol	TNET
Security Exchange Name	NYSE
Entity Well Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 3.0
Entity Common Stock, Shares Outstanding (in shares)		68,750,437
Documents Incorporated by Reference	Portions of the Registrant’s Definitive Proxy Statement to be issued in connection with its Annual Meeting of Stockholders, scheduled to be held on June 4, 2020, are incorporated by reference into Part III of this Form 10-K.
Document Year Focus	2019
Document Period Focus	FY
Amendment Flag	false
Current Year End Date	--12-31
Entity Central Index Key	0000937098

CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues	$ 3,856	$ 3,503	$ 3,275
Insurance costs	2,927	2,610	2,466
Cost of providing services	245	229	213
Sales and marketing	190	182	187
General and administrative	137	142	114
Systems development and programming	43	49	45
Depreciation and amortization of intangible assets	46	40	33
Total costs and operating expenses	3,588	3,252	3,058
Operating income	268	251	217
Other income (expense):
Interest expense, bank fees and other	(21)	(22)	(20)
Interest income	23	12	3
Income before provision for income taxes	270	241	200
Income taxes	58	49	22
Net income	212	192	178
Comprehensive income	$ 212	$ 192	$ 178
Net income per share:
Basic (in dollars per share)	$ 3.04	$ 2.72	$ 2.57
Diluted (in dollars per share)	$ 2.99	$ 2.65	$ 2.49
Weighted average shares:
Basic (in shares)	70	70	69
Diluted (in shares)	71	72	71
Professional service revenues
Revenues	$ 530	$ 487	$ 458
Insurance service revenues
Revenues	$ 3,326	$ 3,016	$ 2,817

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 213	$ 228
Investments	68	54
Restricted cash, cash equivalents and investments	1,180	942
Accounts receivable, net	9	11
Unbilled revenue, net	285	304
Prepaid expenses, net	52	48
Other current assets	64	59
Total current assets	1,871	1,646
Noncurrent assets:
Restricted cash, cash equivalents and investments, noncurrent	212	187
Investments, noncurrent	125	135
Property, equipment and software, net	85	79
Operating lease right-of-use asset	55
Goodwill	289	289
Other intangible assets, net	15	21
Other assets	96	78
Total assets	2,748	2,435
Current liabilities:
Accounts payable and other current liabilities	31	45
Long-term debt	22	22
Client deposits	44	56
Accrued wages	391	352
Accrued health insurance costs, net	167	135
Accrued workers' compensation costs, net	61	67
Payroll tax liabilities and other payroll withholdings	901	729
Operating lease liabilities	17
Insurance premiums and other payables	9	19
Total current liabilities	1,643	1,425
Noncurrent liabilities:
Long-term debt, noncurrent	369	391
Accrued workers' compensation costs, noncurrent, net	144	158
Deferred taxes	61	68
Operating lease liabilities, noncurrent	48
Other non-current liabilities	8	18
Total liabilities	2,273	2,060
Total stockholders' equity
Preferred stock ($0.000025 par value per share; 20,000,000 shares authorized; no shares issued or outstanding at December 31, 2018 and 2017)	0	0
Common stock and additional paid - in capital ($0.000025 par value per share; 750,000,000 shares authorized; 70,596,559 and 69,818,392 shares issued and outstanding at December 31, 2018 and 2017, respectively)	694	641
Accumulated deficit	(219)	(266)
Total stockholders’ equity	475	375
Total liabilities & stockholders' equity	$ 2,748	$ 2,435

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Preferred stock
Preferred stock, par value (in dollars per share)	$ 0.000025	$ 0.000025
Shares authorized (in shares)	20,000,000	20,000,000
Shares Issued (in shares)	0	0
Shares outstanding (in shares)	0	0
Common stock and additional paid-in capital
Common stock, par value (in dollars per share)	$ 0.000025	$ 0.000025
Shares authorized (in shares)	750,000,000	750,000,000
Shares issued (in shares)	69,065,491	70,596,559
Shares outstanding (in shares)	69,065,491	70,596,559

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock and Additional Paid-In Capital	Accumulated Deficit
Beginning balance at Dec. 31, 2016	$ 35	$ 535	$ (500)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from exercise of stock options		11
Issuance of common stock for employee stock purchase plan		5
Stock-based compensation expense		32
Net income	178		178
Repurchase of common stock			(44)
Awards effectively repurchased for required employee withholding taxes			(11)
Ending balance at Dec. 31, 2017	206	583	(377)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from exercise of stock options		7
Issuance of common stock for employee stock purchase plan		7
Stock-based compensation expense		44
Net income	192		192
Repurchase of common stock			(61)
Awards effectively repurchased for required employee withholding taxes			(22)
Ending balance at Dec. 31, 2018	375	641	(266)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from exercise of stock options		2
Issuance of common stock for employee stock purchase plan		9
Stock-based compensation expense		42
Net income	212		212
Repurchase of common stock			(140)
Awards effectively repurchased for required employee withholding taxes			(25)
Ending balance at Dec. 31, 2019	$ 475	$ 694	$ (219)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities
Net income	$ 212	$ 192	$ 178
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	57	46	35
Noncash lease expense	16	0	0
Stock-based compensation	41	44	32
Deferred income taxes	(7)	1	(25)
Amortization of (premium) discount of investments	(1)	0	0
Changes in operating assets and liabilities:
Accounts receivable, net	5	10	(14)
Unbilled revenue, net	19	(14)	(4)
Prepaid expenses, net	(5)	(9)	28
Accounts payable and other current liabilities	(15)	(8)	23
Client deposits	(12)	4	(4)
Accrued wages	40	23	26
Accrued health insurance costs, net	32	(16)	22
Accrued workers' compensation costs, net	(20)	(7)	9
Payroll taxes payable and other payroll withholdings	172	(305)	294
Operating lease liabilities	(17)	0	0
Other assets	(34)	(64)	(11)
Other liabilities	(12)	(1)	17
Net cash (used in) provided by operating activities	471	(104)	606
Investing activities
Purchases of marketable securities	(302)	(258)	0
Proceeds from sale and maturity of marketable securities	159	101	14
Acquisitions of property and equipment	(45)	(43)	(38)
Net cash used in investing activities	(188)	(200)	(24)
Financing activities
Repurchase of common stock	(140)	(61)	(44)
Proceeds from issuance of common stock	11	14	16
Awards effectively repurchased for required employee withholding taxes	(25)	(22)	(11)
Proceeds from issuance of notes payable, net	0	210	0
Payments for extinguishment of debt	0	(204)	0
Repayment of debt	(22)	(22)	(38)
Net cash used in financing activities	(176)	(85)	(77)
Net (decrease) increase in cash and cash equivalents, unrestricted and restricted	107	(389)	505
Beginning of period	1,349	1,738	1,233
End of period	1,456	1,349	1,738
Supplemental disclosures of cash flow information
Interest paid	19	17	16
Income taxes paid, net	62	49	2
Supplemental schedule of noncash investing and financing activities
Payable for purchase of property and equipment	$ 2	$ 3	$ 2

Description of Business and Significant Accounting Policies

12 Months Ended

Dec. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES

Description of Business

TriNet Group, Inc. (TriNet, or the Company, we, our and us), a professional employer organization, provides comprehensive human resources solutions for small to midsize businesses under a co-employment model. These HR solutions include multi-state payroll processing and tax administration, employee benefits programs, including health insurance and retirement plans, workers' compensation insurance and claims management, employment and benefit law compliance, and other HR-related services. Through the co-employment relationship, we are the employer of record for certain employment-related administrative and regulatory purposes for the worksite employees (WSEs), including:


•	compensation through wages and salaries,


•	employer payroll-related tax payments,


•	employee payroll-related tax withholdings and payments,


•	employee benefit programs, including health and life insurance, and others, and


•	workers' compensation coverage.

Our clients are responsible for the day-to-day job responsibilities of the WSEs.

We operate in one reportable segment. All of our service revenues are generated from external clients. Less than 1% of our revenue is generated outside of the United States.

Basis of Presentation

Our consolidated financial statements are prepared in conformity with generally accepted accounting principles in the United States of America (GAAP). All intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect certain reported amounts and related disclosures.

These estimates are based on historical experience and on various other assumptions that we believe to be reasonable from the facts available to us. Some of the assumptions are highly uncertain at the time of estimation. To the extent actual experience differs from the assumptions used, our consolidated financial statements could be materially affected.

Revenue Recognition

On January 1, 2018, we adopted Accounting Standards Codification Topic 606 (ASC Topic 606) using the modified retrospective method applied to those contracts which were not completed as of January 1, 2018. Results for reporting periods beginning after January 1, 2018 are presented under ASC Topic 606, while the comparative prior period amounts are not restated and continue to be reported in accordance with statements previously accounted for under Accounting Standards Codification Topic 605.

Upon adoption of ASC Topic 606, we recorded a $2 million cumulative effect adjustment to opening retained earnings as of January 1, 2018. Impacts from adoption of the new standard on our revenue recognition include:


•	Our annual service contracts with our clients that are cancellable with 30 days' notice are considered 30-day contracts under the new standard;


•	Professional service revenues are recognized on an output basis which results in recognition at the time payroll is processed;


•	Our non-refundable set up fees are no longer deferred but accounted for as part of our transaction price and are allocated among professional service revenues and insurance services revenues; and


•	The majority of sales commissions related to onboarding new clients that were previously expensed are capitalized as contract assets and amortized over the estimated client life.

Revenues are recognized when the promised services are transferred to our clients, in an amount that reflects the consideration that we expect to receive in exchange for services. We generate all of our revenue from contracts with clients. We disaggregate revenues into professional services revenues and insurance services revenues as reported on the consolidated statements of income and comprehensive income. Generally, both the client and the Company may terminate the contract without penalty by providing a 30-day notice.

Performance Obligations

At contract inception, we assess the services promised in our contracts with clients and identify a performance obligation for each distinct promise to transfer to the client a service or bundle of services. We determined that the following distinct services represent separate performance obligations:


•	Payroll and payroll tax processing,


•	Health benefits services, and


•	Workers’ compensation services.

Payroll and payroll tax processing performance obligations include services to process payroll and payroll tax-related transactions on behalf of our clients. Revenues associated with this performance obligation are reported as professional service revenues and recognized using an output method in which the promised services are transferred when a client's payroll is processed by us and WSEs are paid. Professional service revenues are stated net of the gross payroll and payroll tax amounts funded by our clients. Although we assume the responsibilities to process and remit the payroll and payroll related obligations, we do not assume employment-related responsibilities such as determining the amount of the payroll and related payroll obligations. As a result, we are the agent in this arrangement for revenue recognition purposes.

Health benefits and workers' compensation services include performance obligations to provide TriNet-sponsored health benefits and workers' compensation insurance coverage through insurance policies provided by third-party insurance carriers and settle high deductible amounts on those policies. Revenues associated with these performance obligations are reported as insurance services revenues and are recognized using the output method over the period of time that the client and WSEs are covered under TriNet-sponsored insurance policies.

We control the selection of health benefits and workers' compensation coverage made available. As a result, we are the principal in this arrangement for revenue recognition purposes and insurance services revenues are reported gross.

We generally charge new customers a nominal upfront non-refundable fee to recover our costs to set them up on our TriNet platform for payroll processing and other administrative services, such as benefit enrollments. These fees are accounted for as part of our transaction price and are allocated among the performance obligations based on their relative standalone selling prices.

Variable Consideration and Pricing Allocation

Our contracts with customers generally do not include any variable consideration. However, from time to time, we may offer incentive credits to our clients considered to be variable consideration including incentive credits issued related to contract renewals. Incentive credits are recorded as a reduction to revenue as part of the transaction price at contract inception when there is a basis to reasonably estimate the amount of the incentive credit and we reduce the full amount of the credit only to the extent that it is probable that a significant reversal of any incremental revenue will not occur. These incentive credits are allocated among the performance obligations based on their relative standalone selling prices.

We allocate the total transaction price to each performance obligation based on the estimated relative standalone selling prices of the promised services underlying each performance obligation. The transaction price for the payroll and payroll tax processing performance obligations is determined upon establishment of the contract that contains the final terms of the arrangement, including the description and price of each service purchased. The estimated service fee is calculated based on observable inputs and include the following key assumptions: target profit margin, pricing strategies including the mix of services purchased and competitive factors, and client and industry specifics.

The transaction price for health benefits insurance and workers' compensation insurance performance obligations is determined during the new client on-boarding and enrollment processes based on the types of benefits coverage the clients and WSEs have elected and the applicable risk profile of the client. We estimate our service fees based on actuarial forecasts of our expected insurance premiums and loss sensitive premium costs, and amounts to cover our costs to administer these programs.

We require our clients to prefund payroll and related taxes and other withholding liabilities before payroll is processed or due for payment. Under the provision of our contracts with clients, we generally will process the payment of a client’s payroll only when the client successfully funds the amount required. As a result, there is no financing arrangement for the contracts, however, certain contracts to provide payroll and payroll tax processing services permit the client to pay certain payroll tax components ratably over a 12-month period rather than as payroll tax is determined on wages paid, which may be considered a significant financing arrangement under ASC Topic 606. However, as the period between our performing the service under the contract and when the client pays for the service is less than one year, we have elected, as a practical expedient, not to adjust the transaction price.

Unbilled Revenue

We recognize WSE payroll and payroll tax liabilities in the period in which the WSEs perform work. When clients' pay periods cross reporting periods, we accrue the portion of the unpaid WSE payroll where we assume, under state regulations, the obligation for the payment of wages and the corresponding payroll tax liabilities associated with the work performed prior to period-end. These estimated payroll and payroll tax liabilities are recorded in accrued wages. The associated receivables, including estimated revenues, offset by advance collections from clients, are recorded as unbilled revenue. As of December 31, 2019 and 2018, advance collections included in unbilled revenue were $95 million and $23 million respectively.

Contract Costs

We recognize as deferred commission expense the incremental cost to obtain a contract with a client for certain components under our commission plans for sales representatives and channel partners that are directly related to new customers onboarded as we expect to recover these costs through future service fees. Such assets are amortized over the estimated average client tenure. These commissions are earned on the basis of the revenue generated from payroll and payroll tax processing performance obligations. When the commission on a renewal contract is not commensurate with the commission on the initial contract, any incremental commission will be capitalized and amortized over the estimated average client tenure. If the commission for both the initial contract and renewal contracts are commensurate, such commissions are expensed in the contract period. The below table summarizes the amounts capitalized and amortized during the years ended December 31, 2019 and 2018:



	Year Ended December 31,
	2019				2018
(in millions)	Capitalized		Amortized		Capitalized		Amortized
Deferred commission expense	$	45	$	10	$	33	$	2

Certain commission plans pay a commission on estimated professional service revenues over the first 12 months of the contract with clients. The portion of commission paid in excess of the actual commission earned in that period is recorded as prepaid commission. When the prepaid commission is considered earned, it is classified as a deferred commission expense and subject to amortization. We do not have material contract liabilities as of December 31, 2019 and 2018.

Insurance Costs

Our fully insured insurance plans are provided by third-party insurance carriers under risk-based or guaranteed-cost insurance policies. Under risk-based policies, we agree to reimburse our carriers for any claims paid within an agreed-upon per-person deductible layer up to a maximum aggregate exposure limit per policy. These deductible dollar limits and maximum limits vary by carrier and year. Under guaranteed-cost policies, our carriers establish the premiums and we are not responsible for any deductible.

Insurance costs include insurance premiums for coverage provided by insurance carriers, reimbursement of claims payments made by insurance carriers or third-party administrators below a predefined deductible limit, and changes in accrued costs related to our workers' compensation and health benefit insurance.

At policy inception, annual workers' compensation premiums are estimated by the insurance carriers based on projected wages over the duration of the policy period and the risk categories of the WSEs. We initially pay premiums based on these estimates. As actual wages are realized, premium expense recorded may differ from estimated premium expense, creating an asset or liability throughout the policy year. Such asset or liability is reported on our consolidated balance sheets as prepaid expenses or insurance premiums and other payables, respectively.

Accrued Workers' Compensation Costs

We have secured fully insured workers' compensation insurance policies with insurance carriers to administer and pay claims for our clients and WSEs. We are responsible for reimbursing the insurance carriers for losses up to $1 million per claim occurrence (deductible layer). Insurance carriers are responsible for administering and paying claims. We are responsible for reimbursing each carrier up to a deductible limit per occurrence. Accrued workers' compensation costs represent our liability to reimburse insurance carriers for our share of their losses and loss adjustment expenses. These accrued costs are established to provide for the estimated ultimate costs of paying claims within the deductible layer in accordance with workers' compensation insurance policies. These accrued costs include estimates for reported and incurred but not reported (IBNR) losses, accrued costs on reported claims, and expenses associated with processing and settling the claims. In establishing these accrued costs, we use an external actuary to provide an estimate of undiscounted future cash payments that would be made to settle the claims based upon:


•	historical loss experience, exposure data, and industry loss experience related to TriNet’s insurance policies,


•	inputs including WSE job responsibilities and location,


•	historical volume and severity of workers' compensation claims,


•	an estimate of future cost trends,


•	expected loss ratios for the latest accident year or prior accident years, adjusted for the loss trend, the effect of rate changes and other quantifiable factors, and


•	loss development factors to project the reported losses for each accident year to an ultimate basis.

We assess the accrued workers' compensation costs on a quarterly basis. For each reporting period, changes in the actuarial methods and assumptions resulting from changes in actual claims experience and other trends are incorporated into the accrued workers' compensation costs. Adjustments to previously established accrued costs estimates are reflected in the results of operations for the period in which the adjustment is identified. Such adjustments could be significant, reflecting any variety of new adverse or favorable trends. Accordingly, final claim settlements may vary materially from the present estimates, particularly when those payments may not occur until well into the future. In our experience, plan years related to workers' compensation programs may take ten years or more to be settled.

We do not discount accrued workers' compensation costs. Costs expected to be paid within one year are recorded as accrued workers' compensation costs. Costs expected to be paid beyond one year are included in accrued workers' compensation costs, less current portion.

We have collateral agreements with various insurance carriers where either we retain custody of funds in trust accounts which we record as restricted cash and cash equivalents, or remit funds to carriers. Collateral whether held by us, or the carriers, is used to settle our insurance and claim deductible obligations to them. Collateral requirements are established at the policy year and are re-assessed by each carrier annually. Based on the results of each assessment, additional collateral may be required for or paid to the carrier or collateral funds may be released or returned to the Company. In instances where we pay collateral to carriers and the agreement permits net settlement of obligations against collateral held, we record our accrued costs net of that collateral (Carrier Collateral Offset). We offset carrier Collateral Offset against our obligation due within the next 12 months before applying against long-term obligations. Collateral balances in excess of accrued costs are recorded in other assets.

Accrued Health Insurance Costs

We sponsor and administer a number of fully insured, risk-based employee benefit plans, including group health, dental, and vision as an employer plan sponsor under section 3(5) of the ERISA. In 2019, a majority of our group health insurance costs related to risk-based plans. Our remaining group health insurance costs were for guaranteed-cost policies.

Accrued health insurance costs are established to provide for the estimated unpaid costs of reimbursing the carriers for paying claims within the deductible layer in accordance with risk-based health insurance policies. These accrued costs include estimates for reported losses, plus estimates for claims incurred but not paid. We assess accrued health insurance costs regularly based upon external actuarial studies that include other relevant factors such as current and historical claims payment patterns, plan enrollment and medical trend rates.

In certain carrier contracts we are required to prepay the expected claims activity for subsequent periods. These prepaid balances by agreement permit net settlement of obligations and offset the accrued health insurance costs. As of December 31, 2019 and 2018, prepayments offsetting accrued health insurance costs were $39 million and $33 million, respectively. When the prepaid amount is in excess of our recorded liability the net asset position is included in prepaid expenses. As of December 31, 2019 and 2018, accrued health insurance costs offsetting prepaid expenses were $52 million and $50 million, respectively.

Derivative Instruments

In June 2019, we entered into an interest rate collar derivative transaction with no upfront premium to mitigate the risk of changes in interest rates on our floating rate debt. This derivative, for which we have elected and qualify for cash flow hedge accounting, is recorded on the balance sheet at its fair value. Changes in the derivative’s fair value are recorded each period in other comprehensive income until the underlying monthly interest payment and the corresponding portion of the derivative are settled, at which point changes in fair value are recorded in net income. We evaluate this derivative each quarter to determine that it remains effective by comparing the remaining expected cash flows of the derivative against the related expected interest payments of our floating rate debt. We do not enter into any derivatives for trading or other speculative purposes.

Leases

We adopted ASU 2016-02 - Leases (ASC 842) effective January 1, 2019 using the optional transition method, under which we recognized the cumulative effects of initially applying the standard as an adjustment to the opening balance of retained earnings on January 1, 2019 with unchanged comparative periods. As part of this adoption, we elected the following practical expedients:


•	not to reassess 1) whether any contracts that existed prior to adoption have or contain leases, 2) the classification of our existing leases or 3) initial direct costs for existing leases,


•	to use the practical expedient of using hindsight to determine the lease terms and evaluate any impairments in right-of-use assets upon transition, and


•	not separately record non-lease and lease components for all leases in which we act as a lessee.

We determine if a new contractual arrangement is a lease at contract inception. If a contract contains a lease, we evaluate whether it should be classified as an operating or a finance lease. If applicable as a lease, we record our lease liabilities and ROU assets based on the future minimum lease payments over the lease term and only include options to renew a lease in the future minimum lease payments if it is reasonably certain that we will exercise that option. For certain leases with original terms of twelve months or less we recognize the lease expense as incurred and we do not recognize lease liabilities and ROU assets.

We measure our lease liabilities based on the future minimum lease payments discounted over the lease term. We determine our discount rate at lease inception using our incremental borrowing rate, which is based on our outstanding term debts that are collateralized by certain corporate assets. As of December 31, 2019, the weighted-average rate used in discounting the lease liability was 4.4%.

We measure our ROU assets based on the associated lease liabilities adjusted for any lease incentives such as tenant improvement allowances and classify operating ROU assets in other assets in our consolidated balance sheet. For operating leases, we recognize expense for lease payments on a straight-line basis over the lease term.

Cash and Cash Equivalents

Cash and cash equivalents include bank deposits and short-term, highly liquid investments. Investments with original maturity dates of three months or less are considered cash equivalents.

Restricted Cash, Cash Equivalents and Investments

Restricted cash, cash equivalents and investments presented on our consolidated balance sheets include:


•	cash and cash equivalents in trust accounts functioning as security deposits for our insurance carriers,


•	payroll funds collected representing cash collected in advance from clients which we designate as restricted for the purpose of funding WSE payroll and payroll taxes and other payroll related liabilities, and


•	amounts held in trust for current and future premium and claim obligations with our insurance carriers, which amounts are held in trust according to the terms of the relevant insurance policies and by the local insurance regulations of the jurisdictions in which the policies are in force.

Investments

Our investments are primarily classified as available-for-sale and are carried at estimated fair value.

Unrealized gains and losses are reported as a component of accumulated other comprehensive income, net of deferred income taxes. The amortized cost of debt investments is adjusted for amortization of premiums and accretion of discounts from the date of purchase to the earliest call date for premiums or the maturity date for discounts. Such amortization is included in interest income as an addition to or deduction from the coupon interest earned on the investments. We use the specific identification method to determine realized gains and losses on the sale of available-for-sale securities. Realized gains and losses are included in interest income in the accompanying consolidated statements of income and comprehensive income.

We assess our investments for an other-than-temporary impairment loss due to a decline in fair value or other market conditions. We review several factors to determine whether a loss is other than temporary, such as the length and extent of the fair value decline, the financial condition and near-term prospects of the issuer and whether we have the intent to sell or will more likely than not be required to sell before the securities' anticipated recovery, which may be at maturity. If management determines that a security is impaired under these circumstances, the impairment recognized in earnings is measured as the entire difference between the amortized cost and the then-current fair value.

We have investments within our unrestricted and our restricted accounts. Unrestricted investments are recorded on the balance sheet as current or noncurrent based upon the remaining time to maturity, and investments subject to restrictions are classified as current or noncurrent based on the expected payout of the related liability.

Fair Value of Financial Instruments

Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or a liability.

Our financial assets recorded at fair value on a recurring basis are comprised of cash equivalents, available-for-sale marketable securities and certificates of deposits. We measure certain financial assets at fair value for disclosure purposes, as well as on a nonrecurring basis when they are deemed to be other-than-temporarily impaired. Our other current financial assets and liabilities have fair values that approximate their carrying value due to their short-term nature.

Assets and liabilities recorded at fair value are measured and classified in accordance with a three-tier fair value hierarchy based on the observability of the inputs available in the market to measure fair value, summarized as follows:


•	Level 1—observable inputs for identical assets or liabilities, such as quoted prices in active markets,


•	Level 2—inputs other than the quoted prices in active markets that are observable either directly or indirectly,


•	Level 3—unobservable inputs in which there is little or no market data, which requires that we develop our own assumptions.

The fair value hierarchy requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. We classify our cash equivalents, investments and long-term debt in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement in its entirety.

Accounts Receivable

Our accounts receivable represents outstanding gross billings to clients, net of an allowance for doubtful accounts. We require our clients to prefund payroll and related liabilities before payroll is processed or due for payment. If a client fails to fund payroll or misses the funding cut-off, at our sole discretion, we may pay the payroll and the resulting amounts due to us are recognized as accounts receivable. When client payment is received in advance of our performance under the contract, such amount is recorded as client deposits. We establish an allowance for doubtful accounts based on historical experience, the age of the accounts receivable balances, credit quality of clients, current economic conditions and other factors that may affect clients’ ability to pay, and charge-off amounts when they are deemed uncollectible. The allowance was immaterial at December 31, 2019 and $1 million at December 31, 2018.

Property, Equipment and Software

We record property and equipment at historical cost and compute depreciation using the straight-line method over the estimated useful lives of the assets or the lease terms, generally three years to five years for software and office equipment, five years to seven years for furniture and fixtures, and the shorter of the asset life or the remaining lease term for leasehold improvements. We expense the cost of maintenance and repairs as incurred and capitalize leasehold improvements.

We capitalize internal and external costs incurred to develop internal-use computer software during the application development stage. Application development stage costs include software configuration, coding, and installation. Capitalized costs are amortized on a straight-line basis over the estimated useful life, typically ranging from three years to five years, commencing when the software is placed into service. We expense costs incurred during the preliminary project stage, as well as general and administrative, overhead, maintenance and training costs, and costs that do not add functionality to existing systems.

We periodically assess the likelihood of unsuccessful completion of projects in progress, as well as monitor events or changes in circumstances, which might suggest that impairment has occurred and recoverability should be evaluated. An impairment loss is recognized if the carrying amount of the asset is not recoverable and exceeds the future net cash flows expected to be generated by the asset.

We evaluate our long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. An asset is considered impaired if the carrying amount exceeds the undiscounted future net cash flows the asset is expected to generate. An impairment charge is recognized for the amount by which the carrying amount of the assets exceeds its fair value. Assets to be disposed of are reported at the lower of the carrying amount or fair value, less selling costs.

Goodwill and Other Intangible Assets

Our goodwill and identifiable intangible assets with indefinite useful lives are not amortized, but are tested for impairment on an annual basis or when an event occurs or circumstances change in a way to indicate that there has been a potential decline in the fair value of the reporting unit. Goodwill impairment is determined by comparing the estimated fair value of the reporting unit to its carrying amount, including goodwill. All goodwill is associated with one reporting unit within our one reportable segment.

Annually, we perform a qualitative assessment to determine whether it is more likely than not that the fair value of the reporting unit has declined below its carrying value. This assessment considers various financial, macroeconomic, industry, and reporting unit specific qualitative factors. We perform our annual impairment testing in the fourth quarter. Based on the results of our reviews, no impairment loss was recognized in the results of operations for the years ended December 31, 2019, 2018 and 2017.

Intangible assets with finite useful lives are amortized over their respective estimated useful lives ranging from two years to ten years using either the straight-line method or an accelerated method. Intangible assets are reviewed for indicators of impairment at least annually and evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Based on the results of our reviews, no impairment loss was recognized in the results of operations for the years ended December 31, 2019, 2018 and 2017.

Advertising Costs

We expense the costs of producing advertisements at the time production occurs, and expense the cost of running advertisements in the period in which the advertising space or airtime is used as sales and marketing expense. Advertising costs were $18 million, $17 million, and $8 million for the years ended December 31, 2019, 2018 and 2017, respectively.

Stock Based Compensation

Our stock based awards to employees include time based and performance based restricted stock units and restricted stock awards, stock options and an employee stock purchase plan. Compensation expense associated with restricted stock units and restricted stock awards is based on the fair value of common stock on the date of grant. Compensation expense associated with stock options and employee stock purchase plan are based on the estimated grant date fair value method using the Black-Scholes option pricing model. Expense is recognized using a straight-line amortization method over the respective vesting period for awards that are ultimately expected to vest, with adjustments to expense recognized in the period in which forfeitures occur.

Income Taxes

We account for our provision for income taxes using the asset and liability method, under which we recognize income taxes payable or refundable for current year and deferred tax assets and liabilities for the future tax effect of events that have been recognized in our financial statements or tax returns. We measure our current and deferred tax assets and liabilities based on provision of enacted tax laws of those jurisdictions in which we operate. The effect of changes in tax laws and regulations, or interpretations, is recognized in our consolidated financial statements in the period that includes the enactment date.

We recognize deferred tax assets and liabilities based on temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and amounts used for income tax purposes, as well as the expected benefits of using net operating loss and other carryforwards. We are required to establish a valuation allowance when it is determined more likely than not that the deferred tax assets will not be realized. Provision for income taxes may change when estimates used in determining valuation allowances change or when receipt of new information indicates the need for adjustment in valuation allowances. Changes in valuation allowances are reflected as a component of provision for income taxes in the period the change is enacted.

We recognize a reserve for uncertain tax positions taken or expected to be taken in a tax return when it is concluded that tax positions are not more likely than not to be sustained upon examination by taxing authorities, including resolution of any related appeals or litigation processes, based on the technical merits of the positions. Assumptions, judgment and the use of estimates are required in determining if the more likely than not standard has been met when developing the provision for income taxes and in determining the expected benefit. The tax benefits of the position recognized in the financial statements are then measured based on the largest amount of benefit that is greater than 50% likely to be realized upon settlement with a taxing authority. Unrecognized tax benefits due to tax uncertainties that do not meet the minimum probability threshold are included as other liabilities and are charged to earnings in the period that such determination is made. We recognize interest and penalties related to uncertain tax positions as a component of income tax expense. Accrued interest and penalties are included in other non-current liabilities on the consolidated balance sheet.

Concentrations of Credit Risk

Financial instruments subject to concentrations of credit risk include cash, cash equivalents and investments (unrestricted and restricted), accounts receivable, and amounts due from insurance carriers. We maintain these financial assets principally in domestic financial institutions. We perform periodic evaluations of the relative credit standing of these institutions. Our exposure to credit risk in the event of default by the financial institutions holding these funds is limited to amounts currently held by the institution in excess of insured amounts.

Under the terms of professional services agreements, clients agree to maintain sufficient funds or other satisfactory credit at all times to cover the cost of their current payroll, all accrued paid time off, vacation or sick leave balances, and other vested wage and benefit obligations for all their work site employees. We generally require payment from our clients on or before the applicable payroll date.

For certain clients, we require an indemnity guarantee payment (IGP) supported by a letter of credit, bond, or a certificate of deposit from certain financial institutions. The IGP typically equals the total payroll and service fee for one average payroll period.

No client accounted for more than 10% of total revenues in the years ended December 31, 2019, 2018 and 2017. Bad debt expense, net of recoveries was $1 million, for each of the years ended December 31, 2019, 2018 and 2017.

Recent Accounting Pronouncements

Recently adopted accounting guidance

Leases - In February 2016, the FASB issued ASC 842, which replaced existing lease guidance under GAAP. Under this guidance, we recognize on our balance sheet lease liabilities representing the present value of future lease payments and an associated right-of-use asset representing our right to use or control the use of specified assets for the lease term for any operating lease with a term greater than one year.

The impact of our adoption of ASC 842 did not have a material impact on our income statement or cash flow statement. The impact on our balance sheets is as follows:



	December 31, 2019
(in millions)	As reported			Balance Using Previous Standard			Increase (Decrease)
Balance sheet
Assets
Operating lease right-of-use assets	$	55		$	—		$	55
Liabilities
Operating lease liabilities	17			—			17
Operating lease liabilities, noncurrent	48			10			38
Equity
Accumulated deficit	(219		)	(219		)	—

Recently issued accounting pronouncements

Credit Losses - In June 2016, the FASB issued ASU 2016-13 - Financial Instruments - Credit Losses (ASC Topic 326) which requires financial assets to be presented at the net amount expected to be collected. We will be required to use forward-looking information when evaluating an allowance for our accounts receivable, unbilled revenue and other financial assets measured at amortized cost. ASC Topic 326 also modifies the impairment guidance for available-for-sale debt securities to require an allowance for credit losses. We will adopt ASC Topic 326 effective January 1, 2020 using a modified retrospective approach through a cumulative-effect adjustment to retained earnings. We do not expect the adoption of ASC Topic 326 to have a material impact on our financial statements.

Cash, Cash Equivalents and Investments

12 Months Ended

Dec. 31, 2019

Cash and Cash Equivalents [Abstract]

CASH, CASH EQUIVALENTS AND INVESTMENTS

Under the terms of the agreements with certain of our workers' compensation and health benefit insurance carriers, we are required to maintain collateral in trust accounts for the benefit of specified insurance carriers and to reimburse the carriers’ claim payments within our deductible layer. We invest a portion of the collateral amounts in marketable securities. We report the current and noncurrent portions of these trust accounts as restricted cash, cash equivalents and investments on the consolidated balance sheets.

We require our clients to prefund their payroll and related taxes and other withholding liabilities before payroll is processed or due for payment. This prefund is included in restricted cash, cash equivalents and investments as payroll funds collected, which is designated to pay pending payrolls, payroll tax liabilities and other payroll withholdings.

We also invest available corporate funds, primarily in fixed income securities which meet the requirements of our corporate investment policy and are classified as available for sale (AFS).

Our total cash, cash equivalents and investments are summarized below:



	December 31, 2019								December 31, 2018
(in millions)	Cash and cash equivalents		Available-for-sale marketable securities		Certificate of deposits		Total		Cash and cash equivalents		Available-for-sale marketable securities		Certificate of deposits		Total
Cash and cash equivalents	$	213	$	—	$	—	$	213	$	228	$	—	$	—	$	228
Investments	—		68		—		68		—		54		—		54
Restricted cash, cash equivalents and investments
Payroll funds collected	1,018		—		—		1,018		783		—		—		783
Collateral for health benefits claims	98		—		—		98		75		—		—		75
Collateral for workers' compensation claims	62		—		—		62		66		1		—		67
Collateral to secure standby letter of credit	—		—		—		—		—		—		2		2
Other security deposits	2		—		—		2		15		—		—		15
Total restricted cash, cash equivalents and investments	1,180		—		—		1,180		939		1		2		942
Investments, noncurrent	—		125		—		125		—		135		—		135
Restricted cash, cash equivalents and investments, noncurrent
Collateral for workers' compensation claims	63		148		1		212		182		5		—		187
Total	$	1,456	$	341	$	1	$	1,798	$	1,349	$	195	$	2	$	1,546

Investments

12 Months Ended

Dec. 31, 2019

Investments, Debt and Equity Securities [Abstract]

INVESTMENTS

The amortized cost, gross unrealized gains, gross unrealized losses, and fair values of our AFS investments as of December 31, 2019 and 2018 are presented below:



	December 31, 2019								December 31, 2018
(in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Asset-backed securities	$	30	$	—	$	—	$	30	$	33	$	—	$	—	$	33
Corporate bonds	123		1		—		124		99		—		—		99
U.S. government agencies and government-sponsored agencies	14		—		—		14		7		—		—		7
U.S. treasuries	163		—		—		163		46		—		—		46
Exchange traded fund	—		—		—		—		1		—		—		1
Certificates of deposit	1		—		—		1		—		—		—		—
Other debt securities	10		—		—		10		9		—		—		9
Total	$	341	$	1	$	—	$	342	$	195	$	—	$	—	$	195

Gross unrealized losses as of December 31, 2019 and 2018 were not material.

Unrealized losses on fixed income securities are principally caused by changes in interest rates and the financial condition of the issuer. In analyzing an issuer's financial condition, we consider whether the securities are issued by the federal government or its agencies, whether downgrades by credit rating agencies have occurred, and industry analysts' reports. As we have the ability to hold these investments until maturity, or for the foreseeable future, no decline was deemed to be other-than-temporary. Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties.

The fair value of debt investments by contractual maturity are shown below:



(in millions)	December 31, 2019		December 31, 2018
One year or less	$	80	$	59
Over one year through five years	237		120
Over five years through ten years	8		3
Over ten years	17		12
Total fair value	$	342	$	194

The gross proceeds from sales and maturities of AFS securities for the years ended December 31, 2019, 2018, and 2017 are shown below. We had immaterial realized gains and losses from sales of investments for the years ended December 31, 2019, 2018, and 2017.



	Year Ended December 31,
(in millions)	2019		2018		2017
Gross proceeds from sales	$	76	$	54	$	—
Gross proceeds from maturities	83		47		14
Total	$	159	$	101	$	14

Financial Instruments and Fair Value Measurements

12 Months Ended

Dec. 31, 2019

Investments, Debt and Equity Securities [Abstract]

FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS

Fair Value of Financial Instruments

We use an independent pricing source to determine the fair value of our securities. The independent pricing source utilizes various pricing models for each asset class; including the market approach. The inputs and assumptions for the pricing models are market observable inputs including trades of comparable securities, dealer quotes, credit spreads, yield curves and other market-related data.

We have not adjusted the prices obtained from the independent pricing service and we believe the prices received from the independent pricing service are representative of the prices that would be received to sell the assets at the measurement date (exit price).

The carrying value of the Company's cash equivalents and restricted cash equivalents approximate their fair values due to their short-term maturities.

We did not have any Level 3 financial instruments recognized in our balance sheet as of December 31, 2019 and 2018. There were no transfers between levels as of December 31, 2019 and 2018.

Fair Value Measurements on a Recurring Basis

The following tables summarize our financial instruments by significant categories and fair value measurement on a recurring basis as of December 31, 2019 and 2018:



(in millions)	Level 1		Level 2		Total
December 31, 2019
Cash equivalents:
Money market mutual funds	$	89	$	—	$	89
U.S. treasuries	—		3		3
Total cash equivalents	89		3		92
Investments:
Asset-backed securities	—		30		30
Corporate bonds	—		96		96
U.S. government agencies and government-sponsored agencies	—		5		5
U.S. treasuries	—		53		53
Other debt securities	—		10		10
Total investments	—		194		194
Restricted cash equivalents:
Money market mutual funds	42		—		42
U.S. treasuries	—		12		12
Certificate of deposit	—		2		2
Commercial paper	14		—		14
Total restricted cash equivalents	56		14		70
Restricted investments:
Corporate bonds	—		28		28
U.S. government agencies and government-sponsored agencies	—		9		9
U.S. treasuries	—		110		110
Certificate of deposit	—		1		1
Total restricted investments	—		148		148
Total investments and restricted cash equivalents and investments	$	145	$	359	$	504



(in millions)	Level 1		Level 2		Total
December 31, 2018
Cash equivalents:
Money market mutual funds	$	4	$	—	$	4
U.S. treasuries	—		1		1
Total cash equivalents	4		1		5
Investments:
Asset-backed securities	—		33		33
Corporate bonds	—		99		99
U.S. government agencies and government-sponsored agencies	—		7		7
U.S. treasuries	—		41		41
Other debt securities	—		9		9
Total investments	—		189		189
Restricted cash equivalents:
Money market mutual funds	48		—		48
Commercial paper	20		—		20
Total restricted cash equivalents	68		—		68
Restricted investments:					—
U.S. treasuries	—		5		5
Exchange traded fund	1		—		1
Certificate of deposit	—		2		2
Total restricted investments	1		7		8
Total investments and restricted cash equivalents and investments	$	73	$	197	$	270

Fair Value of Financial Instruments Disclosure

Long-Term Debt

Our long-term debt is a floating rate debt and the fair value of our floating rate debt approximates its carrying value (exclusive of issuance costs) at December 31, 2019 and 2018. The fair value of our floating rate debt is estimated based on a discounted cash flow, which incorporates credit spreads and market interest rates to estimate the fair value and is considered Level 3 in the hierarchy for fair value measurement.

Derivative Instruments

In June 2019, we entered into an interest rate collar derivative transaction with no upfront premium to mitigate the risk of changes in interest rates on the interest payments on a portion of our floating rate debt. If short-term interest rates increase, we will incur higher interest expense on any future outstanding balances of floating rate debt. We use this derivative as part of our interest rate risk management strategy and designated it as a cash flow hedge. If interest rates rise above the cap strike rate on the contract, we will receive variable-rate amounts and if interest rates fall below the floor strike rate on the contract, we will pay variable-rate amounts.

The following table summarizes the fair value of our derivative instrument at December 31, 2019:



	December 31, 2019
					Fair Market Value
(in millions)	Hedge type	Final settlement date	Notional amount		Other current assets		Accounts payable and other current liabilities
Derivatives designated as hedging instruments
Collar - LIBOR	Cash flow	May 2022	$	213	$	—	$	—

The pre-tax effect of derivative instrument for year ended December 31, 2019 is insignificant and we estimate that an insignificant amount of net derivative gains or losses included in other comprehensive income will be reclassified into earnings within the following 12 months. There were no cash flows associated with the derivative for year ended December 31, 2019.

As of December 31, 2019, we do not hold, nor have we posted, any collateral related to the above derivative instrument.

The interest rate collar derivative is classified as Level 2 in the fair value hierarchy as its value is determined using observable inputs such as forward LIBOR curves.

PROPERTY, EQUIPMENT AND SOFTWARE, NET

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

PROPERTY, EQUIPMENT AND SOFTWARE, NET

Property, equipment and software, net, consists of the following:



(in millions)	December 31, 2019			December 31, 2018
Software	$	174		$	144
Office equipment, including data processing equipment	27			27
Leasehold improvements	24			21
Furniture, fixtures, and equipment	17			15
Projects in progress	3			2
Total	245			209
Less: Accumulated depreciation	(160		)	(130		)
Property and equipment, net	$	85		$	79

Projects in progress consist primarily of development costs for internally developed software, which we capitalize and amortize on a straight-line basis over the estimated useful life.

The following table summarizes our depreciation expense and capitalized internally developed software costs and related depreciation expense.



	Year Ended December 31,
(in millions)	2019		2018		2017
Depreciation expense	$	41	$	35	$	28
Capitalized internally developed software costs	31		33		29
Depreciation expense for capitalized internally developed software costs	29		24		17

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

The following summarizes goodwill and other intangible assets:



		December 31, 2019							December 31, 2018
(in millions)	Weighted Average Amortization Period	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Goodwill		$	289	$	—		$	289	$	289	$	—		$	289
Amortizable intangibles:
Customer contracts	10 years	90		(76		)	14		90		(71		)	19
Developed technology	5 years	5		(4		)	1		5		(3		)	2
Total		$	95	$	(80	)	$	15	$	95	$	(74	)	$	21

Amortization of intangible assets during the years ended December 31, 2019, 2018 and 2017 was $5 million for each period. We evaluate the remaining useful life of intangible assets annually to determine whether events and circumstances warrant a revision to the estimated remaining useful life.

Expense related to intangibles amortization in future periods as of December 31, 2019 is expected to be as follows:



Year ending December 31:	Amount (in millions)
2020	$	5
2021	4
2022	4
2023	2
Total	$	15

Accrued Workers' Compensation Costs

12 Months Ended

Dec. 31, 2019

Insurance [Abstract]

ACCRUED WORKERS' COMPENSATION COSTS

The following table summarizes the accrued workers’ compensation cost activity for the years ended December 31, 2019, 2018 and 2017:



	Year Ended December 31,
(in millions)	2019			2018			2017
Total accrued costs, beginning of year	$	238		$	255		$	255
Incurred
Current year	72			80			98
Prior years	(31		)	(28		)	(6		)
Total incurred	41			52			92
Paid
Current year	(14		)	(12		)	(14		)
Prior years	(51		)	(57		)	(78		)
Total paid	(65		)	(69		)	(92		)
Total accrued costs, end of year	$	214		$	238		$	255

The following table summarizes workers' compensation liabilities on the consolidated balance sheets:



(in millions)	December 31, 2019			December 31, 2018
Total accrued costs, end of year	$	214		$	238
Collateral paid to carriers and offset against accrued costs	(9		)	(13		)
Total accrued costs, net of carrier collateral offset	$	205		$	225

Payable in less than 1 year (net of collateral paid to carriers of $3 as of December 31, 2019 and 2018)	$	61		$	67
Payable in more than 1 year (net of collateral paid to carriers of $6 and $10 as of December 31, 2019 and 2018, respectively)	144			158
Total accrued costs, net of carrier collateral offset	$	205		$	225

Incurred claims related to prior years represent changes in estimates for ultimate losses on workers' compensation claims. For the years ended December 31, 2019 and December 31, 2018, the favorable development was primarily due to lower than expected severity development on claims that had previously been reported, as well as a lower than expected reported claim frequency. For the year ended December 31, 2017, the favorable development was primarily due to lower than expected severity of reported claims associated with office worker WSEs in recent accident years.

As of December 31, 2019 and 2018, we had $46 million and $57 million, respectively, of collateral held by insurance carriers of which $9 million and $13 million, respectively, was offset against accrued workers' compensation costs as the agreements permit and are net settled of insurance obligations against collateral held.

Leases (Notes)

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

LEASES

Our leasing activities predominantly consist of leasing office space that we occupy, which we have classified as operating leases. Our leases are comprised of fixed payments with remaining lease terms of 1 to 9 years, some of which include options to extend for up to 15 years. As of December 31, 2019, we have not included any options to extend or cancel in the calculation of our lease liability or ROU asset. We do not have any significant residual value guarantees or restrictive covenants in our leases.

During the year ended December 31, 2019, we recognized operating lease expense of $19 million.

During the year ended December 31, 2019, we paid $17 million to reduce operating lease liabilities and recognized $17 million in new operating lease liabilities in exchange for ROU assets.

As of December 31, 2019, the weighted average remaining lease term on our operating leases was 6.1 years. Future minimum lease payments as of December 31, 2019 and December 31, 2018 were as follows:



(in millions)	December 31, 2019 ⁽¹⁾			December 31, 2018 ⁽²⁾
2019	$	—		$	18
2020	19			17
2021	11			11
2022	10			9
2023	9			8
2024	6			5
2025 and thereafter	19			20
Total future minimum lease payments	$	74		$	88
Less: imputed interest	(9		)	N/A⁽³⁾
Total operating lease liabilities	$	65		N/A⁽³⁾
Current portion	17			N/A⁽³⁾
Non-current portion	48			N/A⁽³⁾

(1) Presented in accordance with ASC 842.

(2) Presented in accordance with ASC 840.

(3) N/A - Not Applicable under ASC 840.

Long-Term Debt

12 Months Ended

Dec. 31, 2019

Line of Credit Facility [Abstract]

LONG-TERM DEBT

As of December 31, 2019 and 2018, long-term debt consisted of the following:



(in millions)	December 31, 2019			December 31, 2018
2018 Term Loan A	392			414
Total term loans	392			414
Deferred loan costs	(1		)	(1		)
Less: current portion	(22		)	(22		)
Long-term debt, noncurrent	$	369		$	391

Annual contractual interest rate	3.42		%	4.15		%
Effective interest rate	3.52		%	4.25		%

In June 2018 we entered into a $425 million term loan A (our 2018 Term Loan) under our new credit agreement (2018 Credit Agreement). The proceeds of the 2018 Term Loan were used to repay our previously outstanding term loans.

The 2018 Credit Agreement includes a $250 million revolving credit facility (our 2018 Revolver), which will be used solely for working capital and other general corporate purposes. The 2018 Revolver includes capacity for a $20 million swingline facility. Letters of credit issued pursuant to the revolving credit facility reduce the amount available for borrowing under the 2018 Revolver. At December 31, 2019, we had $16 million of letters of credit outstanding and remaining capacity of $234 million under the 2018 Revolver.

Interest on our 2018 Term Loan is payable quarterly and is variable based on LIBOR plus 1.625% or the prime rate plus 0.625%, at our option, subject to certain rate adjustments based upon our total leverage ratio. At December 31, 2019, the interest rate was based on LIBOR plus 1.625%. We are required to pay a quarterly commitment fee on the daily unused amount of the commitments under our 2018 Revolver, as well as fronting fees and other customary fees for letters of credit issued under our 2018 Revolver, which is subject to adjustments based on our total leverage ratio.

Borrowings under our 2018 Term Loan and 2018 Revolver are secured by substantially all of our assets, other than excluded assets as defined in our 2018 Credit Agreement, which includes certain customary assets, assets held in trusts as collateral and WSE related assets.

We are permitted to make voluntary prepayments at any time without payment of a premium. We are required to make mandatory prepayments of term loans (without payment of a premium) with (i) net cash proceeds from issuances of debt (other than certain permitted debt), and (ii) net cash proceeds from certain non-ordinary course asset sales and casualty and condemnation proceeds (subject to reinvestment rights and other exceptions).

The 2018 Credit Agreement contains certain financial covenants and restrictive covenants customary for facilities of this type, including restrictions on indebtedness, liens, investments, mergers, dispositions, prepayment of indebtedness (other than our 2018 Term Loan and our 2018 Revolver), dividends, distributions and transactions with affiliates, as well as minimum interest coverage and maximum total leverage ratio requirements. We were in compliance with all financial covenants under the credit facilities at December 31, 2019.

The remaining balance of our 2018 Term Loan will be repaid in quarterly installments in aggregate annual amounts as follows:



	Year ending December 31,
(in millions)	2020		2021		2022		2023		2024		Thereafter
Term loan repayments	$	22	$	22	$	22	$	326	$	—	$	—

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Contingencies We are and, from time to time, have been and may in the future become involved in various litigation matters, legal proceedings, and claims arising in the ordinary course of our business, including disputes with our clients or various class action, collective action, representative action, and other proceedings arising from the nature of our co-employment relationship with our clients and WSEs in which we are named as a defendant. In addition, due to the nature of our co-employment relationship with our clients and WSEs, we could be subject to liability for federal and state law violations, even if we do not participate in such violations. While our agreements with our clients contain indemnification provisions related to the conduct of our clients, we may not be able to avail ourselves of such provisions in every instance. We have accrued our current best estimates of probable losses with respect to these matters, which are individually and in aggregate immaterial to our consolidated financial statements. While the outcome of the matters described above cannot be predicted with certainty, management currently does not believe that any such claims or proceedings will have a materially adverse effect on our consolidated financial position, results of operations, or cash flows. However, the unfavorable resolution of any particular matter or our reassessment of our exposure for any of the above matters based on additional information obtained in the future could have a material impact on our consolidated financial position, results of operations, or cash flows.

Stock Based Compensation (Notes)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

STOCK BASED COMPENSATION

Equity Based Incentive Plans

Our 2019 Equity Incentive Plan (the 2019 Plan), approved in May 2019, provides for the grant of stock awards, including stock options, RSUs, RSAs, and other stock awards. Shares available for grant as of December 31, 2019 was approximately 3 million.

The 2009 Equity Incentive Plan (the 2009 Plan), was terminated, replaced and superseded by the 2019 Plan, except that any outstanding awards granted under the 2009 Plan remain in effect pursuant to their terms.

Stock Options

Stock options are granted to employees at exercise prices equal to the fair market value of our common stock on the dates of grant. Stock options generally have a maximum contractual term of 10 years. Stock options generally vest over 4 years, and are generally forfeited if the employee terminates service prior to vesting.

The following table summarizes stock option activity under our equity-based plan for the year ended December 31, 2019:



	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in millions)
Balance at December 31, 2018	655,515		$	12.90	4.91	$	19
Exercised	(187,504	)	10.80
Expired	(6,000	)	0.50
Balance at December 31, 2019	462,011		$	13.90	4.02	$	20
Exercisable at December 31, 2019	462,011		$	13.90	4.02	$	20
Vested and expected to vest at December 31, 2019	462,011		$	13.90	4.02	$	20



	Year Ended December 31,
Additional Disclosures for Stock Options (in millions)	2019		2018		2017
Total fair value of options vested	$	1	$	4	$	7
Total intrinsic value of options exercised	9		24		36
Cash received from options exercised	2		7		11

Restricted Stock Units (RSUs) and Restricted Stock Awards (RSAs)

Time-based RSUs and RSAs generally vest over a four-year term. Performance-based RSUs and RSAs are subject to vesting requirements based on certain financial performance metrics as defined in the grant notice. Actual number of shares earned may range from 0% to 200% of the target award. Awards granted in 2019 and 2018 are based on a single-year performance period subject to subsequent multi-year vesting with 50% of the shares earned vesting in one year after the performance period and the remaining shares in the year after. RSUs and RSAs are generally forfeited if the participant terminates service prior to vesting.

The following tables summarize RSU and RSA activity under our equity-based plans for the year ended December 31, 2019:



	Time-based RSUs and RSAs
	Total Number of RSUs		Total Number of RSAs		Total Number of Shares		Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2018	1,560,685		98,445		1,659,130		$	33.88
Granted	616,224		—		616,224		60.99
Vested	(891,633	)	(37,309	)	(928,942	)	32.53
Forfeited	(180,547	)	—		(180,547	)	38.89
Nonvested at December 31, 2019	1,104,729		61,136		1,165,865		$	48.47



	Performance-based RSUs and RSAs
	Total Number of RSUs		Total Number of RSAs		Total Number Shares		Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2018	176,869		248,347		425,216		$	42.02
Granted	83,110		—		83,110		59.83
Vested	(155,589	)	(122,387	)	(277,976	)	39.45
Cancelled	(61,400	)	—		(61,400	)	61.75
Forfeited	(27,238	)	(11,103	)	(38,341	)	41.52
Nonvested at December 31, 2019	15,752		114,857		130,609		$	49.70



	Time-based RSUs and RSAs
	Year Ended December 31,
Additional Disclosures for equity-based plans	2019		2018		2017
Total grant date fair value of shares granted (in millions)	$	38	$	38	$	37
Total grant date fair value of shares vested (in millions)	$	30	$	28	$	21
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees	315,762		348,010		332,857



	Performance-based RSUs and RSAs
	Year Ended December 31,
Additional Disclosures for equity-based plans	2019		2018		2017
Total grant date fair value of shares granted (in millions)	$	4	$	14	$	10
Total grant date fair value of shares vested (in millions)	$	11	$	7	$	—
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees	135,877		110,222		2,244

Employee Stock Purchase Plan

Our 2014 Employee Stock Purchase plan (ESPP) offers eligible employees an option to purchase shares of our common stock through payroll deductions. The purchase price is equal to the lesser of 85% of the fair market value of our common stock on the offering date or 85% of the fair market value of our common stock on the applicable purchase date. Offering periods are approximately six months in duration and will end on or about May 15 and November 15 of each year. The plan is considered to be a compensatory plan. As of December 31, 2019, approximately 3 million shares were reserved for future issuances under the ESPP.

In applying the Black Scholes option valuation model for the ESPP options, we use the following assumptions:



	Year Ended December 31,
(in millions)	2019		2018		2017
Expected Term (in Years)	0.5		0.5		0.5
Expected Volatility	27-42%		27-37%		28-37%
Risk-Free Interest Rate	1.6-2.5%		1.42-2.5%		0.62-1.42%
Expected Dividend Yield	0	%	0	%	0	%

Shares Issued under ESPP	207,324		175,966		224,928

Stock Based Compensation

Stock based compensation expense is measured based on the fair value of the stock award on the grant date and recognized over the requisite service period for each separately vesting portion of the stock award. Stock based compensation expense and other disclosures for stock based awards made to our employees pursuant to the equity plans was as follows:



	Year Ended December 31,
(in millions)	2019		2018		2017
Cost of providing services	$	8	$	10	$	8
Sales and marketing	3		8		6
General and administrative	28		22		14
Systems development and programming costs	2		4		4
Total stock based compensation expense	$	41	$	44	$	32
Total stock based compensation capitalized	$	1	$	—	$	—
Income tax benefit related to stock based compensation expense	$	11	$	11	$	7
Tax benefit realized from stock options exercised and similar awards	$	18	$	23	$	28

The table below summarizes unrecognized compensation expense for the year ended December 31, 2019 associated with the following:



	Amount (in millions)		Weighted-Average Period (in Years)
Nonvested stock options	$	—	0
Nonvested RSUs	51		2.27
Nonvested RSAs	2		0.49

Stockholders' Equity (Notes)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

STOCKHOLDERS' EQUITY

Common Stock

The following table shows the beginning and ending balances of our issued and outstanding common stock for the year ended December 31, 2019, 2018, and 2017:



	Year Ended December 31,
	2019		2018		2017
Shares issued and outstanding, beginning balance	70,596,559		69,818,392		69,015,690
Issuance of common stock from vested restricted stock units	1,036,119		1,634,271		1,020,352
Issuance of common stock from exercise of stock options	187,504		617,157		1,441,957
Issuance of common stock for employee stock purchase plan	207,324		175,966		224,928
Repurchase of common stock	(2,510,376	)	(1,190,995	)	(1,549,434	)
Awards effectively repurchased for required employee withholding taxes	(451,639	)	(458,232	)	(335,101	)
Shares issued and outstanding, ending balance	69,065,491		70,596,559		69,818,392

Stock Repurchases

On February 6, 2019, our board of directors authorized a $300 million incremental increase to our ongoing stock repurchase program. This repurchase authorization has no expiration. We retire shares in the period they are acquired and account for the payment as a reduction to stockholders' equity.

The following table summarizes the share repurchases under this program for the years ended December 31, 2019, 2018 and 2017:



	Year Ended December 31,
(in millions, except per share data)	2019		2018		2017
Total cost	$	140	$	61	$	44
Total shares	2,510,376		1,190,995		1,549,434
Average price per share	$	55.64	$	51.22	$	34.46

As of December 31, 2019, $236 million remains available for repurchase under all authorizations approved by the board of directors.

Income Taxes

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

INCOME TAXES

Provision for Income Taxes

We are subject to tax in U.S. federal and various state and local jurisdictions, as well as Canada. We are not subject to any material income tax examinations in federal or state jurisdictions for tax years prior to January 1, 2015. The provision for income taxes consists of the following:



	Year Ended December 31,
(in millions)	2019			2018			2017
Current:
Federal	$	53		$	41		$	46
State	12			7			1
Total Current	65			48			47
Deferred:
Federal	(2		)	(3		)	12
State	(5		)	4			3
Revaluation due to legislative changes	—			—			(40		)
Total Deferred	(7		)	1			(25		)
Total	$	58		$	49		$	22

Certain prior year amounts have been reclassified to conform to current period presentation. The U.S. federal statutory income tax rate reconciled to our effective tax rate is as follows:



	Year Ended December 31,
	2019							2018							2017
(in millions, except percent)	Pre-Tax Income		Tax Expense/(Benefit)			Percent of Pre-Tax Income (Loss)		Pre-Tax Income		Tax Expense/(Benefit)			Percent of Pre-Tax Income (Loss)		Pre-Tax Income		Tax Expense/(Benefit)			Percent of Pre-Tax Income (Loss)
	$	270						$	241						$	200
U.S. federal statutory tax rate			$	57		21	%			$	51		21	%			$	70		35	%
State income taxes, net of federal benefit			20			7				18			8				10			5
Tax rate change			—			—				—			—				(40		)	(20	)
Nondeductible meals, entertainment and penalties			1			—				1			—				1			—
Stock based compensation			(1		)	—				(9		)	(4	)			(15		)	(7	)
Uncertain tax positions			—			—				1			—				4			2
Tax credits			(7		)	(3	)			(5		)	(2	)			(4		)	(2	)
State and tax return to provision adjustments			(8		)	(3	)			(7		)	(3	)			(5		)	(3	)
Sec 199 benefits			(1		)	—				—			—				(3		)	(1	)
Other			(3		)	(1	)			(1		)	—				4			2
Total			$	58		21	%			$	49		20	%			$	22		11	%

Our effective income tax rate increased by 1% to 21% in 2019 from 20% in 2018. The increase was primarily attributable to one-time expenses associated with stock based compensation and a reduction from excess tax benefits related to stock-based compensation. These increases were partially offset by a one-time benefit associated with prior year tax expense and changes in valuation allowance.

The revaluation of deferred taxes from changes in the statutory tax rates resulted in a discrete tax benefit representing an immaterial amount in 2019 and 2018, and 20% for the year ended December 31, 2017.

Deferred Income Taxes

Significant components of our deferred tax assets and liabilities are as follows:



	Year Ended December 31,
(in millions)	2019			2018
Deferred tax assets:
Net operating losses (federal and state)	$	3		$	3
Accrued expenses	10			8
Accrued workers' compensation costs	9			9
Stock based compensation	3			8
Tax benefits relating to uncertain positions	1			—
Tax credits (federal and state)	7			7
Total	33			35
Valuation allowance	(5		)	(7		)
Total deferred tax assets	28			28
Deferred tax liabilities:
Depreciation and amortization	(27		)	(24		)
Deferred service revenues	(41		)	(62		)
Prepaid health plan expenses	(1		)	—
Prepaid commission expenses	(19		)	(9		)
Total deferred tax liabilities	(88		)	(95		)
Net deferred tax liabilities	$	(60	)	$	(67	)

As of December 31, 2019 and 2018, we have various state net operating loss carryforwards of $53 million and $61 million, respectively, which, if unused, will expire in years 2020 through 2039 with the exception of an immaterial amount that will be carried forward indefinitely. As of December 31, 2019 and 2018, we have state tax credit carryforwards (net of federal benefit) of $6 million and $7 million, respectively available that will begin expiring in 2021, which are offset by a valuation allowance of $4 million and $6 million as of December 31, 2019 and 2018, respectively.

The provision for income taxes for the year ended December 31, 2019 included $8 million of excess tax benefits resulting from equity incentive plan activities.

We previously paid Notices of Proposed Assessments disallowing employment tax credits totaling $11 million, plus interest of $4 million in connection with the IRS examination of Gevity HR, Inc. and its subsidiaries, which was acquired by TriNet in June 2009. TriNet filed suit in June 2016 to recover the disallowed credits, and the issue is being resolved through the litigation process. TriNet and the U.S. filed cross motions for summary judgment in federal district court. On September 17, 2018, the district court granted our motion for summary judgment and denied the U.S.'s motion. On January 18, 2019, the district court entered judgment in favor of TriNet in the amount of $15 million, plus interest. The U.S. filed a notice of appeal of the federal district court's decision on March 18, 2019. The U.S. filed its opening brief in the court of appeals on June 10, 2019 and we filed our answering brief on July 24, 2019 to which the government filed its reply brief on September 6, 2019. We will continue to vigorously defend our position through the litigation process. Given the uncertainty of the outcome of any appeal, it remains possible that our recovery of the refund will be less than the total amount in dispute.

Valuation Allowance

We have recorded a valuation allowance to reflect the estimated amount of deferred tax assets that may not be realized. A reconciliation of the beginning and ending amount of the valuation allowance is presented in the table below:



	Year Ended December 31,
(in millions)	2019			2018		2017
Valuation allowance at January 1	$	7		$	7	$	6
Credited/ charged to net income	(2		)	—		1
Valuation allowance at December 31	5			7		7

Uncertain Tax Positions

As of December 31, 2019 and 2018, the total unrecognized tax benefits related to uncertain income tax positions, which would affect the effective tax rate if recognized, were $7 million and $6 million, respectively.

A reconciliation of the beginning and ending amount of unrecognized tax benefits (excluding interest and penalties) is presented in the table below:



	Year Ended December 31,
(in millions)	2019			2018			2017
Unrecognized tax benefits at January 1	$	6		$	6		$	1
Additions for tax positions of prior periods	1			1			4
Additions for tax positions of current period	1			—			1
Reductions for tax positions of prior period:
Lapse of applicable statute of limitations	(1		)	(1		)	—
Unrecognized tax benefits at December 31	$	7		$	6		$	6

As of December 31, 2019 and 2018, the total amount of gross interest and penalties accrued were immaterial. The unrecognized tax benefit, including accrued interest and penalties, is included in other liabilities on the consolidated balance sheet.

It is reasonably possible the amount of the unrecognized benefit could increase or decrease within the next twelve months, which would have an impact on net income.

Earnings Per Share (EPS)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

EARNINGS PER SHARE

Basic EPS is computed based on the weighted average shares of common stock outstanding during the period. Diluted EPS is computed based on those shares used in the basic EPS computation, plus potentially dilutive shares issuable under our equity-based compensation plans using the treasury stock method. Shares that are potentially anti-dilutive are excluded.

The following table presents the computation of our basic and diluted EPS attributable to our common stock:



	Year Ended December 31,
(in millions, except per share data)	2019		2018		2017
Net income	$	212	$	192	$	178
Weighted average shares of common stock outstanding	70		70		69
Basic EPS	$	3.04	$	2.72	$	2.57

Net income	$	212	$	192	$	178
Weighted average shares of common stock outstanding	70		70		69
Dilutive effect of stock options and restricted stock units	1		2		2
Weighted average shares of common stock outstanding	71		72		71
Diluted EPS	$	2.99	$	2.65	$	2.49

Common stock equivalents excluded from income per diluted share because of their anti-dilutive effect	1		1		2

401(k) Plan	12 Months Ended
401(k) Plan	Dec. 31, 2019
Postemployment Benefits [Abstract]
401(k) PLAN	401(k) PLAN The Company maintains a defined contribution 401(k) plan for the benefit of corporate employees. Under our 401(k) plan, eligible employees may elect to contribute based on their eligible compensation. The Company matches a portion of employee contributions, which amounted to $14 million, $11 million, and $6 million for the years ended December 31, 2019, 2018, and 2017, respectively. We also maintain multiple employer defined contribution plans, which cover WSEs for client companies electing to participate in the plan and for their internal staff employees. We contribute, on behalf of each participating client, varying amounts based on the clients’ policies and serviced employee elections.

Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2019
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS	RELATED PARTY TRANSACTIONS We have service agreements with certain stockholders that we process their employees' payrolls and payroll taxes. From time to time, we also enter into sales and purchases agreements with various companies that have a relationship with our executive officers or members of our board of directors. The relationships are typically an equity investment by the executive officer or board member in the customer / vendor company or our executive officer or board member is a member of the customer / vendor company's board of directors. We have received $25 million, $20 million, and $22 million in total revenues from such related parties during the years ended December 31, 2019, 2018 and 2017, respectively. We have also entered into various software license agreements with software service providers who have board members in common with us. We paid the software service providers $10 million, $5 million, and $6 million during the years ended December 31, 2019, 2018 and 2017, for services we received, respectively.

Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data (Unaudited)

SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)



	Quarter ended
(in millions, except per share data)	March 31		June 30		September 30		December 31
2019
Total revenues	$	934	$	935	$	969	$	1,018
Insurance costs	683		704		748		792
Operating income	82		55		68		63
Net income	63		46		55		48
Basic net income per share	$	0.91	$	0.65	$	0.80	$	0.69
Diluted net income per share	$	0.89	$	0.64	$	0.78	$	0.68
2018
Total revenues	$	861	$	850	$	875	$	917
Insurance costs	641		630		647		692
Operating income	71		76		62		42
Net income	54		58		51		29
Basic net income per share	$	0.77	$	0.82	$	0.73	$	0.41
Diluted net income per share	$	0.75	$	0.80	$	0.71	$	0.40

Description of Business and Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Segment Information

We operate in one reportable segment. All of our service revenues are generated from external clients. Less than 1% of our revenue is generated outside of the United States.

Basis of Presentation

Our consolidated financial statements are prepared in conformity with generally accepted accounting principles in the United States of America (GAAP). All intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect certain reported amounts and related disclosures.

These estimates are based on historical experience and on various other assumptions that we believe to be reasonable from the facts available to us. Some of the assumptions are highly uncertain at the time of estimation. To the extent actual experience differs from the assumptions used, our consolidated financial statements could be materially affected.

Revenue Recognition

On January 1, 2018, we adopted Accounting Standards Codification Topic 606 (ASC Topic 606) using the modified retrospective method applied to those contracts which were not completed as of January 1, 2018. Results for reporting periods beginning after January 1, 2018 are presented under ASC Topic 606, while the comparative prior period amounts are not restated and continue to be reported in accordance with statements previously accounted for under Accounting Standards Codification Topic 605.

Upon adoption of ASC Topic 606, we recorded a $2 million cumulative effect adjustment to opening retained earnings as of January 1, 2018. Impacts from adoption of the new standard on our revenue recognition include:


•	Our annual service contracts with our clients that are cancellable with 30 days' notice are considered 30-day contracts under the new standard;


•	Professional service revenues are recognized on an output basis which results in recognition at the time payroll is processed;


•	Our non-refundable set up fees are no longer deferred but accounted for as part of our transaction price and are allocated among professional service revenues and insurance services revenues; and


•	The majority of sales commissions related to onboarding new clients that were previously expensed are capitalized as contract assets and amortized over the estimated client life.

Revenues are recognized when the promised services are transferred to our clients, in an amount that reflects the consideration that we expect to receive in exchange for services. We generate all of our revenue from contracts with clients. We disaggregate revenues into professional services revenues and insurance services revenues as reported on the consolidated statements of income and comprehensive income. Generally, both the client and the Company may terminate the contract without penalty by providing a 30-day notice.

Performance Obligations

At contract inception, we assess the services promised in our contracts with clients and identify a performance obligation for each distinct promise to transfer to the client a service or bundle of services. We determined that the following distinct services represent separate performance obligations:


•	Payroll and payroll tax processing,


•	Health benefits services, and


•	Workers’ compensation services.

Payroll and payroll tax processing performance obligations include services to process payroll and payroll tax-related transactions on behalf of our clients. Revenues associated with this performance obligation are reported as professional service revenues and recognized using an output method in which the promised services are transferred when a client's payroll is processed by us and WSEs are paid. Professional service revenues are stated net of the gross payroll and payroll tax amounts funded by our clients. Although we assume the responsibilities to process and remit the payroll and payroll related obligations, we do not assume employment-related responsibilities such as determining the amount of the payroll and related payroll obligations. As a result, we are the agent in this arrangement for revenue recognition purposes.

Health benefits and workers' compensation services include performance obligations to provide TriNet-sponsored health benefits and workers' compensation insurance coverage through insurance policies provided by third-party insurance carriers and settle high deductible amounts on those policies. Revenues associated with these performance obligations are reported as insurance services revenues and are recognized using the output method over the period of time that the client and WSEs are covered under TriNet-sponsored insurance policies.

We control the selection of health benefits and workers' compensation coverage made available. As a result, we are the principal in this arrangement for revenue recognition purposes and insurance services revenues are reported gross.

We generally charge new customers a nominal upfront non-refundable fee to recover our costs to set them up on our TriNet platform for payroll processing and other administrative services, such as benefit enrollments. These fees are accounted for as part of our transaction price and are allocated among the performance obligations based on their relative standalone selling prices.

Variable Consideration and Pricing Allocation

Our contracts with customers generally do not include any variable consideration. However, from time to time, we may offer incentive credits to our clients considered to be variable consideration including incentive credits issued related to contract renewals. Incentive credits are recorded as a reduction to revenue as part of the transaction price at contract inception when there is a basis to reasonably estimate the amount of the incentive credit and we reduce the full amount of the credit only to the extent that it is probable that a significant reversal of any incremental revenue will not occur. These incentive credits are allocated among the performance obligations based on their relative standalone selling prices.

We allocate the total transaction price to each performance obligation based on the estimated relative standalone selling prices of the promised services underlying each performance obligation. The transaction price for the payroll and payroll tax processing performance obligations is determined upon establishment of the contract that contains the final terms of the arrangement, including the description and price of each service purchased. The estimated service fee is calculated based on observable inputs and include the following key assumptions: target profit margin, pricing strategies including the mix of services purchased and competitive factors, and client and industry specifics.

The transaction price for health benefits insurance and workers' compensation insurance performance obligations is determined during the new client on-boarding and enrollment processes based on the types of benefits coverage the clients and WSEs have elected and the applicable risk profile of the client. We estimate our service fees based on actuarial forecasts of our expected insurance premiums and loss sensitive premium costs, and amounts to cover our costs to administer these programs.

We require our clients to prefund payroll and related taxes and other withholding liabilities before payroll is processed or due for payment. Under the provision of our contracts with clients, we generally will process the payment of a client’s payroll only when the client successfully funds the amount required. As a result, there is no financing arrangement for the contracts, however, certain contracts to provide payroll and payroll tax processing services permit the client to pay certain payroll tax components ratably over a 12-month period rather than as payroll tax is determined on wages paid, which may be considered a significant financing arrangement under ASC Topic 606. However, as the period between our performing the service under the contract and when the client pays for the service is less than one year, we have elected, as a practical expedient, not to adjust the transaction price.

Unbilled Revenue

We recognize WSE payroll and payroll tax liabilities in the period in which the WSEs perform work. When clients' pay periods cross reporting periods, we accrue the portion of the unpaid WSE payroll where we assume, under state regulations, the obligation for the payment of wages and the corresponding payroll tax liabilities associated with the work performed prior to period-end. These estimated payroll and payroll tax liabilities are recorded in accrued wages. The associated receivables, including estimated revenues, offset by advance collections from clients, are recorded as unbilled revenue. As of December 31, 2019 and 2018, advance collections included in unbilled revenue were $95 million and $23 million respectively.

Contract Costs

We recognize as deferred commission expense the incremental cost to obtain a contract with a client for certain components under our commission plans for sales representatives and channel partners that are directly related to new customers onboarded as we expect to recover these costs through future service fees. Such assets are amortized over the estimated average client tenure. These commissions are earned on the basis of the revenue generated from payroll and payroll tax processing performance obligations. When the commission on a renewal contract is not commensurate with the commission on the initial contract, any incremental commission will be capitalized and amortized over the estimated average client tenure. If the commission for both the initial contract and renewal contracts are commensurate, such commissions are expensed in the contract period.

Insurance Costs

Our fully insured insurance plans are provided by third-party insurance carriers under risk-based or guaranteed-cost insurance policies. Under risk-based policies, we agree to reimburse our carriers for any claims paid within an agreed-upon per-person deductible layer up to a maximum aggregate exposure limit per policy. These deductible dollar limits and maximum limits vary by carrier and year. Under guaranteed-cost policies, our carriers establish the premiums and we are not responsible for any deductible.

Insurance costs include insurance premiums for coverage provided by insurance carriers, reimbursement of claims payments made by insurance carriers or third-party administrators below a predefined deductible limit, and changes in accrued costs related to our workers' compensation and health benefit insurance.

At policy inception, annual workers' compensation premiums are estimated by the insurance carriers based on projected wages over the duration of the policy period and the risk categories of the WSEs. We initially pay premiums based on these estimates. As actual wages are realized, premium expense recorded may differ from estimated premium expense, creating an asset or liability throughout the policy year. Such asset or liability is reported on our consolidated balance sheets as prepaid expenses or insurance premiums and other payables, respectively.

Accrued Workerss Compensation Costs & Accrued Health Insurance Costs

We have secured fully insured workers' compensation insurance policies with insurance carriers to administer and pay claims for our clients and WSEs. We are responsible for reimbursing the insurance carriers for losses up to $1 million per claim occurrence (deductible layer). Insurance carriers are responsible for administering and paying claims. We are responsible for reimbursing each carrier up to a deductible limit per occurrence. Accrued workers' compensation costs represent our liability to reimburse insurance carriers for our share of their losses and loss adjustment expenses. These accrued costs are established to provide for the estimated ultimate costs of paying claims within the deductible layer in accordance with workers' compensation insurance policies. These accrued costs include estimates for reported and incurred but not reported (IBNR) losses, accrued costs on reported claims, and expenses associated with processing and settling the claims. In establishing these accrued costs, we use an external actuary to provide an estimate of undiscounted future cash payments that would be made to settle the claims based upon:


•	historical loss experience, exposure data, and industry loss experience related to TriNet’s insurance policies,


•	inputs including WSE job responsibilities and location,


•	historical volume and severity of workers' compensation claims,


•	an estimate of future cost trends,


•	expected loss ratios for the latest accident year or prior accident years, adjusted for the loss trend, the effect of rate changes and other quantifiable factors, and


•	loss development factors to project the reported losses for each accident year to an ultimate basis.

We assess the accrued workers' compensation costs on a quarterly basis. For each reporting period, changes in the actuarial methods and assumptions resulting from changes in actual claims experience and other trends are incorporated into the accrued workers' compensation costs. Adjustments to previously established accrued costs estimates are reflected in the results of operations for the period in which the adjustment is identified. Such adjustments could be significant, reflecting any variety of new adverse or favorable trends. Accordingly, final claim settlements may vary materially from the present estimates, particularly when those payments may not occur until well into the future. In our experience, plan years related to workers' compensation programs may take ten years or more to be settled.

We do not discount accrued workers' compensation costs. Costs expected to be paid within one year are recorded as accrued workers' compensation costs. Costs expected to be paid beyond one year are included in accrued workers' compensation costs, less current portion.

We have collateral agreements with various insurance carriers where either we retain custody of funds in trust accounts which we record as restricted cash and cash equivalents, or remit funds to carriers. Collateral whether held by us, or the carriers, is used to settle our insurance and claim deductible obligations to them. Collateral requirements are established at the policy year and are re-assessed by each carrier annually. Based on the results of each assessment, additional collateral may be required for or paid to the carrier or collateral funds may be released or returned to the Company. In instances where we pay collateral to carriers and the agreement permits net settlement of obligations against collateral held, we record our accrued costs net of that collateral (Carrier Collateral Offset). We offset carrier Collateral Offset against our obligation due within the next 12 months before applying against long-term obligations. Collateral balances in excess of accrued costs are recorded in other assets.

Accrued Health Insurance Costs

We sponsor and administer a number of fully insured, risk-based employee benefit plans, including group health, dental, and vision as an employer plan sponsor under section 3(5) of the ERISA. In 2019, a majority of our group health insurance costs related to risk-based plans. Our remaining group health insurance costs were for guaranteed-cost policies.

Accrued health insurance costs are established to provide for the estimated unpaid costs of reimbursing the carriers for paying claims within the deductible layer in accordance with risk-based health insurance policies. These accrued costs include estimates for reported losses, plus estimates for claims incurred but not paid. We assess accrued health insurance costs regularly based upon external actuarial studies that include other relevant factors such as current and historical claims payment patterns, plan enrollment and medical trend rates.

In certain carrier contracts we are required to prepay the expected claims activity for subsequent periods. These prepaid balances by agreement permit net settlement of obligations and offset the accrued health insurance costs. As of December 31, 2019 and 2018, prepayments offsetting accrued health insurance costs were $39 million and $33 million, respectively. When the prepaid amount is in excess of our recorded liability the net asset position is included in prepaid expenses. As of December 31, 2019 and 2018, accrued health insurance costs offsetting prepaid expenses were $52 million and $50 million, respectively.

Derivative Instruments

In June 2019, we entered into an interest rate collar derivative transaction with no upfront premium to mitigate the risk of changes in interest rates on our floating rate debt. This derivative, for which we have elected and qualify for cash flow hedge accounting, is recorded on the balance sheet at its fair value. Changes in the derivative’s fair value are recorded each period in other comprehensive income until the underlying monthly interest payment and the corresponding portion of the derivative are settled, at which point changes in fair value are recorded in net income. We evaluate this derivative each quarter to determine that it remains effective by comparing the remaining expected cash flows of the derivative against the related expected interest payments of our floating rate debt. We do not enter into any derivatives for trading or other speculative purposes.

Leases

We adopted ASU 2016-02 - Leases (ASC 842) effective January 1, 2019 using the optional transition method, under which we recognized the cumulative effects of initially applying the standard as an adjustment to the opening balance of retained earnings on January 1, 2019 with unchanged comparative periods. As part of this adoption, we elected the following practical expedients:


•	not to reassess 1) whether any contracts that existed prior to adoption have or contain leases, 2) the classification of our existing leases or 3) initial direct costs for existing leases,


•	to use the practical expedient of using hindsight to determine the lease terms and evaluate any impairments in right-of-use assets upon transition, and


•	not separately record non-lease and lease components for all leases in which we act as a lessee.

We determine if a new contractual arrangement is a lease at contract inception. If a contract contains a lease, we evaluate whether it should be classified as an operating or a finance lease. If applicable as a lease, we record our lease liabilities and ROU assets based on the future minimum lease payments over the lease term and only include options to renew a lease in the future minimum lease payments if it is reasonably certain that we will exercise that option. For certain leases with original terms of twelve months or less we recognize the lease expense as incurred and we do not recognize lease liabilities and ROU assets.

We measure our lease liabilities based on the future minimum lease payments discounted over the lease term. We determine our discount rate at lease inception using our incremental borrowing rate, which is based on our outstanding term debts that are collateralized by certain corporate assets. As of December 31, 2019, the weighted-average rate used in discounting the lease liability was 4.4%.

We measure our ROU assets based on the associated lease liabilities adjusted for any lease incentives such as tenant improvement allowances and classify operating ROU assets in other assets in our consolidated balance sheet. For operating leases, we recognize expense for lease payments on a straight-line basis over the lease term.

Cash and Cash Equivalents

Cash and cash equivalents include bank deposits and short-term, highly liquid investments. Investments with original maturity dates of three months or less are considered cash equivalents.

Restricted Cash, Cash Equivalents and Investments

Restricted cash, cash equivalents and investments presented on our consolidated balance sheets include:


•	cash and cash equivalents in trust accounts functioning as security deposits for our insurance carriers,


•	payroll funds collected representing cash collected in advance from clients which we designate as restricted for the purpose of funding WSE payroll and payroll taxes and other payroll related liabilities, and

•

amounts held in trust for current and future premium and claim obligations with our insurance carriers, which amounts are held in trust according to the terms of the relevant insurance policies and by the local insurance regulations of the jurisdictions in which the policies are in force.

Investments

Our investments are primarily classified as available-for-sale and are carried at estimated fair value.

Unrealized gains and losses are reported as a component of accumulated other comprehensive income, net of deferred income taxes. The amortized cost of debt investments is adjusted for amortization of premiums and accretion of discounts from the date of purchase to the earliest call date for premiums or the maturity date for discounts. Such amortization is included in interest income as an addition to or deduction from the coupon interest earned on the investments. We use the specific identification method to determine realized gains and losses on the sale of available-for-sale securities. Realized gains and losses are included in interest income in the accompanying consolidated statements of income and comprehensive income.

We assess our investments for an other-than-temporary impairment loss due to a decline in fair value or other market conditions. We review several factors to determine whether a loss is other than temporary, such as the length and extent of the fair value decline, the financial condition and near-term prospects of the issuer and whether we have the intent to sell or will more likely than not be required to sell before the securities' anticipated recovery, which may be at maturity. If management determines that a security is impaired under these circumstances, the impairment recognized in earnings is measured as the entire difference between the amortized cost and the then-current fair value.

We have investments within our unrestricted and our restricted accounts. Unrestricted investments are recorded on the balance sheet as current or noncurrent based upon the remaining time to maturity, and investments subject to restrictions are classified as current or noncurrent based on the expected payout of the related liability.

Fair Value of Financial Instruments

Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or a liability.

Our financial assets recorded at fair value on a recurring basis are comprised of cash equivalents, available-for-sale marketable securities and certificates of deposits. We measure certain financial assets at fair value for disclosure purposes, as well as on a nonrecurring basis when they are deemed to be other-than-temporarily impaired. Our other current financial assets and liabilities have fair values that approximate their carrying value due to their short-term nature.

Assets and liabilities recorded at fair value are measured and classified in accordance with a three-tier fair value hierarchy based on the observability of the inputs available in the market to measure fair value, summarized as follows:


•	Level 1—observable inputs for identical assets or liabilities, such as quoted prices in active markets,


•	Level 2—inputs other than the quoted prices in active markets that are observable either directly or indirectly,


•	Level 3—unobservable inputs in which there is little or no market data, which requires that we develop our own assumptions.

The fair value hierarchy requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. We classify our cash equivalents, investments and long-term debt in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement in its entirety.

Accounts Receivable

Our accounts receivable represents outstanding gross billings to clients, net of an allowance for doubtful accounts. We require our clients to prefund payroll and related liabilities before payroll is processed or due for payment. If a client fails to fund payroll or misses the funding cut-off, at our sole discretion, we may pay the payroll and the resulting amounts due to us are recognized as accounts receivable. When client payment is received in advance of our performance under the contract, such amount is recorded as client deposits. We establish an allowance for doubtful accounts based on historical experience, the age of the accounts receivable balances, credit quality of clients, current economic conditions and other factors that may affect clients’ ability to pay, and charge-off amounts when they are deemed uncollectible.

Property and Equipment

We record property and equipment at historical cost and compute depreciation using the straight-line method over the estimated useful lives of the assets or the lease terms, generally three years to five years for software and office equipment, five years to seven years for furniture and fixtures, and the shorter of the asset life or the remaining lease term for leasehold improvements. We expense the cost of maintenance and repairs as incurred and capitalize leasehold improvements.

Internal-use Software

We capitalize internal and external costs incurred to develop internal-use computer software during the application development stage. Application development stage costs include software configuration, coding, and installation. Capitalized costs are amortized on a straight-line basis over the estimated useful life, typically ranging from three years to five years, commencing when the software is placed into service. We expense costs incurred during the preliminary project stage, as well as general and administrative, overhead, maintenance and training costs, and costs that do not add functionality to existing systems.

We periodically assess the likelihood of unsuccessful completion of projects in progress, as well as monitor events or changes in circumstances, which might suggest that impairment has occurred and recoverability should be evaluated. An impairment loss is recognized if the carrying amount of the asset is not recoverable and exceeds the future net cash flows expected to be generated by the asset.

Impairment or Disposal of Long-Lived Assets

We evaluate our long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. An asset is considered impaired if the carrying amount exceeds the undiscounted future net cash flows the asset is expected to generate. An impairment charge is recognized for the amount by which the carrying amount of the assets exceeds its fair value. Assets to be disposed of are reported at the lower of the carrying amount or fair value, less selling costs.

Goodwill and Other Intangible Assets

Our goodwill and identifiable intangible assets with indefinite useful lives are not amortized, but are tested for impairment on an annual basis or when an event occurs or circumstances change in a way to indicate that there has been a potential decline in the fair value of the reporting unit. Goodwill impairment is determined by comparing the estimated fair value of the reporting unit to its carrying amount, including goodwill. All goodwill is associated with one reporting unit within our one reportable segment.

Annually, we perform a qualitative assessment to determine whether it is more likely than not that the fair value of the reporting unit has declined below its carrying value. This assessment considers various financial, macroeconomic, industry, and reporting unit specific qualitative factors. We perform our annual impairment testing in the fourth quarter. Based on the results of our reviews, no impairment loss was recognized in the results of operations for the years ended December 31, 2019, 2018 and 2017.

Intangible assets with finite useful lives are amortized over their respective estimated useful lives ranging from two years to ten years using either the straight-line method or an accelerated method. Intangible assets are reviewed for indicators of impairment at least annually and evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Based on the results of our reviews, no impairment loss was recognized in the results of operations for the years ended December 31, 2019, 2018 and 2017.

Advertising Costs

We expense the costs of producing advertisements at the time production occurs, and expense the cost of running advertisements in the period in which the advertising space or airtime is used as sales and marketing expense.

Stock-Based Compensation

Our stock based awards to employees include time based and performance based restricted stock units and restricted stock awards, stock options and an employee stock purchase plan. Compensation expense associated with restricted stock units and restricted stock awards is based on the fair value of common stock on the date of grant. Compensation expense associated with stock options and employee stock purchase plan are based on the estimated grant date fair value method using the Black-Scholes option pricing model. Expense is recognized using a straight-line amortization method over the respective vesting period for awards that are ultimately expected to vest, with adjustments to expense recognized in the period in which forfeitures occur.

Income Taxes

We account for our provision for income taxes using the asset and liability method, under which we recognize income taxes payable or refundable for current year and deferred tax assets and liabilities for the future tax effect of events that have been recognized in our financial statements or tax returns. We measure our current and deferred tax assets and liabilities based on provision of enacted tax laws of those jurisdictions in which we operate. The effect of changes in tax laws and regulations, or interpretations, is recognized in our consolidated financial statements in the period that includes the enactment date.

We recognize deferred tax assets and liabilities based on temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and amounts used for income tax purposes, as well as the expected benefits of using net operating loss and other carryforwards. We are required to establish a valuation allowance when it is determined more likely than not that the deferred tax assets will not be realized. Provision for income taxes may change when estimates used in determining valuation allowances change or when receipt of new information indicates the need for adjustment in valuation allowances. Changes in valuation allowances are reflected as a component of provision for income taxes in the period the change is enacted.

We recognize a reserve for uncertain tax positions taken or expected to be taken in a tax return when it is concluded that tax positions are not more likely than not to be sustained upon examination by taxing authorities, including resolution of any related appeals or litigation processes, based on the technical merits of the positions. Assumptions, judgment and the use of estimates are required in determining if the more likely than not standard has been met when developing the provision for income taxes and in determining the expected benefit. The tax benefits of the position recognized in the financial statements are then measured based on the largest amount of benefit that is greater than 50% likely to be realized upon settlement with a taxing authority. Unrecognized tax benefits due to tax uncertainties that do not meet the minimum probability threshold are included as other liabilities and are charged to earnings in the period that such determination is made. We recognize interest and penalties related to uncertain tax positions as a component of income tax expense. Accrued interest and penalties are included in other non-current liabilities on the consolidated balance sheet.

Concentrations of Credit Risk

Financial instruments subject to concentrations of credit risk include cash, cash equivalents and investments (unrestricted and restricted), accounts receivable, and amounts due from insurance carriers. We maintain these financial assets principally in domestic financial institutions. We perform periodic evaluations of the relative credit standing of these institutions. Our exposure to credit risk in the event of default by the financial institutions holding these funds is limited to amounts currently held by the institution in excess of insured amounts.

Under the terms of professional services agreements, clients agree to maintain sufficient funds or other satisfactory credit at all times to cover the cost of their current payroll, all accrued paid time off, vacation or sick leave balances, and other vested wage and benefit obligations for all their work site employees. We generally require payment from our clients on or before the applicable payroll date.

For certain clients, we require an indemnity guarantee payment (IGP) supported by a letter of credit, bond, or a certificate of deposit from certain financial institutions. The IGP typically equals the total payroll and service fee for one average payroll period.

Recent Accounting Pronouncements

Recently adopted accounting guidance

Leases - In February 2016, the FASB issued ASC 842, which replaced existing lease guidance under GAAP. Under this guidance, we recognize on our balance sheet lease liabilities representing the present value of future lease payments and an associated right-of-use asset representing our right to use or control the use of specified assets for the lease term for any operating lease with a term greater than one year.

The impact of our adoption of ASC 842 did not have a material impact on our income statement or cash flow statement. The impact on our balance sheets is as follows:



	December 31, 2019
(in millions)	As reported			Balance Using Previous Standard			Increase (Decrease)
Balance sheet
Assets
Operating lease right-of-use assets	$	55		$	—		$	55
Liabilities
Operating lease liabilities	17			—			17
Operating lease liabilities, noncurrent	48			10			38
Equity
Accumulated deficit	(219		)	(219		)	—

Recently issued accounting pronouncements

Credit Losses - In June 2016, the FASB issued ASU 2016-13 - Financial Instruments - Credit Losses (ASC Topic 326) which requires financial assets to be presented at the net amount expected to be collected. We will be required to use forward-looking information when evaluating an allowance for our accounts receivable, unbilled revenue and other financial assets measured at amortized cost. ASC Topic 326 also modifies the impairment guidance for available-for-sale debt securities to require an allowance for credit losses. We will adopt ASC Topic 326 effective January 1, 2020 using a modified retrospective approach through a cumulative-effect adjustment to retained earnings. We do not expect the adoption of ASC Topic 326 to have a material impact on our financial statements.

Description of Business and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Capitalized Contract Cost

The below table summarizes the amounts capitalized and amortized during the years ended December 31, 2019 and 2018:



	Year Ended December 31,
	2019				2018
(in millions)	Capitalized		Amortized		Capitalized		Amortized
Deferred commission expense	$	45	$	10	$	33	$	2

Impact of Adoption of ASC 606

The impact on our balance sheets is as follows:



	December 31, 2019
(in millions)	As reported			Balance Using Previous Standard			Increase (Decrease)
Balance sheet
Assets
Operating lease right-of-use assets	$	55		$	—		$	55
Liabilities
Operating lease liabilities	17			—			17
Operating lease liabilities, noncurrent	48			10			38
Equity
Accumulated deficit	(219		)	(219		)	—

Cash, Cash Equivalents and Investments (Tables)

12 Months Ended

Dec. 31, 2019

Cash and Cash Equivalents [Abstract]

Cash, Cash Equivalents and Investments

Our total cash, cash equivalents and investments are summarized below:



	December 31, 2019								December 31, 2018
(in millions)	Cash and cash equivalents		Available-for-sale marketable securities		Certificate of deposits		Total		Cash and cash equivalents		Available-for-sale marketable securities		Certificate of deposits		Total
Cash and cash equivalents	$	213	$	—	$	—	$	213	$	228	$	—	$	—	$	228
Investments	—		68		—		68		—		54		—		54
Restricted cash, cash equivalents and investments
Payroll funds collected	1,018		—		—		1,018		783		—		—		783
Collateral for health benefits claims	98		—		—		98		75		—		—		75
Collateral for workers' compensation claims	62		—		—		62		66		1		—		67
Collateral to secure standby letter of credit	—		—		—		—		—		—		2		2
Other security deposits	2		—		—		2		15		—		—		15
Total restricted cash, cash equivalents and investments	1,180		—		—		1,180		939		1		2		942
Investments, noncurrent	—		125		—		125		—		135		—		135
Restricted cash, cash equivalents and investments, noncurrent
Collateral for workers' compensation claims	63		148		1		212		182		5		—		187
Total	$	1,456	$	341	$	1	$	1,798	$	1,349	$	195	$	2	$	1,546

Investments (Tables)

12 Months Ended

Dec. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Amortized Cost, Gross Unrealized Gains and Losses, Fair Values of Investments

The amortized cost, gross unrealized gains, gross unrealized losses, and fair values of our AFS investments as of December 31, 2019 and 2018 are presented below:



	December 31, 2019								December 31, 2018
(in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Asset-backed securities	$	30	$	—	$	—	$	30	$	33	$	—	$	—	$	33
Corporate bonds	123		1		—		124		99		—		—		99
U.S. government agencies and government-sponsored agencies	14		—		—		14		7		—		—		7
U.S. treasuries	163		—		—		163		46		—		—		46
Exchange traded fund	—		—		—		—		1		—		—		1
Certificates of deposit	1		—		—		1		—		—		—		—
Other debt securities	10		—		—		10		9		—		—		9
Total	$	341	$	1	$	—	$	342	$	195	$	—	$	—	$	195

Fair Value of Debt Investments by Contractual Maturity

The fair value of debt investments by contractual maturity are shown below:



(in millions)	December 31, 2019		December 31, 2018
One year or less	$	80	$	59
Over one year through five years	237		120
Over five years through ten years	8		3
Over ten years	17		12
Total fair value	$	342	$	194

Proceeds from Available-for-sale Securities

The gross proceeds from sales and maturities of AFS securities for the years ended December 31, 2019, 2018, and 2017 are shown below. We had immaterial realized gains and losses from sales of investments for the years ended December 31, 2019, 2018, and 2017.



	Year Ended December 31,
(in millions)	2019		2018		2017
Gross proceeds from sales	$	76	$	54	$	—
Gross proceeds from maturities	83		47		14
Total	$	159	$	101	$	14

Financial Instruments and Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Fair Value Measurements on a Recurring Basis

The following tables summarize our financial instruments by significant categories and fair value measurement on a recurring basis as of December 31, 2019 and 2018:



(in millions)	Level 1		Level 2		Total
December 31, 2019
Cash equivalents:
Money market mutual funds	$	89	$	—	$	89
U.S. treasuries	—		3		3
Total cash equivalents	89		3		92
Investments:
Asset-backed securities	—		30		30
Corporate bonds	—		96		96
U.S. government agencies and government-sponsored agencies	—		5		5
U.S. treasuries	—		53		53
Other debt securities	—		10		10
Total investments	—		194		194
Restricted cash equivalents:
Money market mutual funds	42		—		42
U.S. treasuries	—		12		12
Certificate of deposit	—		2		2
Commercial paper	14		—		14
Total restricted cash equivalents	56		14		70
Restricted investments:
Corporate bonds	—		28		28
U.S. government agencies and government-sponsored agencies	—		9		9
U.S. treasuries	—		110		110
Certificate of deposit	—		1		1
Total restricted investments	—		148		148
Total investments and restricted cash equivalents and investments	$	145	$	359	$	504



(in millions)	Level 1		Level 2		Total
December 31, 2018
Cash equivalents:
Money market mutual funds	$	4	$	—	$	4
U.S. treasuries	—		1		1
Total cash equivalents	4		1		5
Investments:
Asset-backed securities	—		33		33
Corporate bonds	—		99		99
U.S. government agencies and government-sponsored agencies	—		7		7
U.S. treasuries	—		41		41
Other debt securities	—		9		9
Total investments	—		189		189
Restricted cash equivalents:
Money market mutual funds	48		—		48
Commercial paper	20		—		20
Total restricted cash equivalents	68		—		68
Restricted investments:					—
U.S. treasuries	—		5		5
Exchange traded fund	1		—		1
Certificate of deposit	—		2		2
Total restricted investments	1		7		8
Total investments and restricted cash equivalents and investments	$	73	$	197	$	270

Schedule of Cash Flow Hedging Instruments

The following table summarizes the fair value of our derivative instrument at December 31, 2019:



	December 31, 2019
					Fair Market Value
(in millions)	Hedge type	Final settlement date	Notional amount		Other current assets		Accounts payable and other current liabilities
Derivatives designated as hedging instruments
Collar - LIBOR	Cash flow	May 2022	$	213	$	—	$	—

PROPERTY, EQUIPMENT AND SOFTWARE, NET (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Property and Equipment, Net

Property, equipment and software, net, consists of the following:



(in millions)	December 31, 2019			December 31, 2018
Software	$	174		$	144
Office equipment, including data processing equipment	27			27
Leasehold improvements	24			21
Furniture, fixtures, and equipment	17			15
Projects in progress	3			2
Total	245			209
Less: Accumulated depreciation	(160		)	(130		)
Property and equipment, net	$	85		$	79

The following table summarizes our depreciation expense and capitalized internally developed software costs and related depreciation expense.



	Year Ended December 31,
(in millions)	2019		2018		2017
Depreciation expense	$	41	$	35	$	28
Capitalized internally developed software costs	31		33		29
Depreciation expense for capitalized internally developed software costs	29		24		17

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Goodwill and Other Intangible Assets

The following summarizes goodwill and other intangible assets:



		December 31, 2019							December 31, 2018
(in millions)	Weighted Average Amortization Period	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Goodwill		$	289	$	—		$	289	$	289	$	—		$	289
Amortizable intangibles:
Customer contracts	10 years	90		(76		)	14		90		(71		)	19
Developed technology	5 years	5		(4		)	1		5		(3		)	2
Total		$	95	$	(80	)	$	15	$	95	$	(74	)	$	21

Expected Expense Related to Intangibles Amortization in Future Periods

Expense related to intangibles amortization in future periods as of December 31, 2019 is expected to be as follows:



Year ending December 31:	Amount (in millions)
2020	$	5
2021	4
2022	4
2023	2
Total	$	15

Accrued Workers' Compensation Costs (Tables)

12 Months Ended

Dec. 31, 2019

Insurance [Abstract]

Summary of Activities for Unpaid Claims, Claims Adjustment Expenses and Workers' Compensation Liabilities

The following table summarizes the accrued workers’ compensation cost activity for the years ended December 31, 2019, 2018 and 2017:



	Year Ended December 31,
(in millions)	2019			2018			2017
Total accrued costs, beginning of year	$	238		$	255		$	255
Incurred
Current year	72			80			98
Prior years	(31		)	(28		)	(6		)
Total incurred	41			52			92
Paid
Current year	(14		)	(12		)	(14		)
Prior years	(51		)	(57		)	(78		)
Total paid	(65		)	(69		)	(92		)
Total accrued costs, end of year	$	214		$	238		$	255

The following table summarizes workers' compensation liabilities on the consolidated balance sheets:



(in millions)	December 31, 2019			December 31, 2018
Total accrued costs, end of year	$	214		$	238
Collateral paid to carriers and offset against accrued costs	(9		)	(13		)
Total accrued costs, net of carrier collateral offset	$	205		$	225

Payable in less than 1 year (net of collateral paid to carriers of $3 as of December 31, 2019 and 2018)	$	61		$	67
Payable in more than 1 year (net of collateral paid to carriers of $6 and $10 as of December 31, 2019 and 2018, respectively)	144			158
Total accrued costs, net of carrier collateral offset	$	205		$	225

Leases (Tables)

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Operating Lease Payments

Future minimum lease payments as of December 31, 2019 and December 31, 2018 were as follows:



(in millions)	December 31, 2019 ⁽¹⁾			December 31, 2018 ⁽²⁾
2019	$	—		$	18
2020	19			17
2021	11			11
2022	10			9
2023	9			8
2024	6			5
2025 and thereafter	19			20
Total future minimum lease payments	$	74		$	88
Less: imputed interest	(9		)	N/A⁽³⁾
Total operating lease liabilities	$	65		N/A⁽³⁾
Current portion	17			N/A⁽³⁾
Non-current portion	48			N/A⁽³⁾

(1) Presented in accordance with ASC 842.

(2) Presented in accordance with ASC 840.

(3) N/A - Not Applicable under ASC 840.

Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2019

Line of Credit Facility [Abstract]

Components of Notes Payable

As of December 31, 2019 and 2018, long-term debt consisted of the following:



(in millions)	December 31, 2019			December 31, 2018
2018 Term Loan A	392			414
Total term loans	392			414
Deferred loan costs	(1		)	(1		)
Less: current portion	(22		)	(22		)
Long-term debt, noncurrent	$	369		$	391

Annual contractual interest rate	3.42		%	4.15		%
Effective interest rate	3.52		%	4.25		%

Aggregate Annual Term Loan Repayments

The remaining balance of our 2018 Term Loan will be repaid in quarterly installments in aggregate annual amounts as follows:



	Year ending December 31,
(in millions)	2020		2021		2022		2023		2024		Thereafter
Term loan repayments	$	22	$	22	$	22	$	326	$	—	$	—

Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Summary of Stock Option Activity Under Equity-Based Plans

The following table summarizes stock option activity under our equity-based plan for the year ended December 31, 2019:



	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in millions)
Balance at December 31, 2018	655,515		$	12.90	4.91	$	19
Exercised	(187,504	)	10.80
Expired	(6,000	)	0.50
Balance at December 31, 2019	462,011		$	13.90	4.02	$	20
Exercisable at December 31, 2019	462,011		$	13.90	4.02	$	20
Vested and expected to vest at December 31, 2019	462,011		$	13.90	4.02	$	20

Additional Disclosure for Stock Options



	Year Ended December 31,
Additional Disclosures for Stock Options (in millions)	2019		2018		2017
Total fair value of options vested	$	1	$	4	$	7
Total intrinsic value of options exercised	9		24		36
Cash received from options exercised	2		7		11

Summary of RSU and RSA Activity Under Equity-Based Plans

The following tables summarize RSU and RSA activity under our equity-based plans for the year ended December 31, 2019:



	Time-based RSUs and RSAs
	Total Number of RSUs		Total Number of RSAs		Total Number of Shares		Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2018	1,560,685		98,445		1,659,130		$	33.88
Granted	616,224		—		616,224		60.99
Vested	(891,633	)	(37,309	)	(928,942	)	32.53
Forfeited	(180,547	)	—		(180,547	)	38.89
Nonvested at December 31, 2019	1,104,729		61,136		1,165,865		$	48.47



	Performance-based RSUs and RSAs
	Total Number of RSUs		Total Number of RSAs		Total Number Shares		Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2018	176,869		248,347		425,216		$	42.02
Granted	83,110		—		83,110		59.83
Vested	(155,589	)	(122,387	)	(277,976	)	39.45
Cancelled	(61,400	)	—		(61,400	)	61.75
Forfeited	(27,238	)	(11,103	)	(38,341	)	41.52
Nonvested at December 31, 2019	15,752		114,857		130,609		$	49.70

Additional Disclosures for Equity-Based Plans



	Time-based RSUs and RSAs
	Year Ended December 31,
Additional Disclosures for equity-based plans	2019		2018		2017
Total grant date fair value of shares granted (in millions)	$	38	$	38	$	37
Total grant date fair value of shares vested (in millions)	$	30	$	28	$	21
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees	315,762		348,010		332,857



	Performance-based RSUs and RSAs
	Year Ended December 31,
Additional Disclosures for equity-based plans	2019		2018		2017
Total grant date fair value of shares granted (in millions)	$	4	$	14	$	10
Total grant date fair value of shares vested (in millions)	$	11	$	7	$	—
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees	135,877		110,222		2,244

Weighted-Average Assumptions Used to Estimate Fair Value of Stock Options

In applying the Black Scholes option valuation model for the ESPP options, we use the following assumptions:



	Year Ended December 31,
(in millions)	2019		2018		2017
Expected Term (in Years)	0.5		0.5		0.5
Expected Volatility	27-42%		27-37%		28-37%
Risk-Free Interest Rate	1.6-2.5%		1.42-2.5%		0.62-1.42%
Expected Dividend Yield	0	%	0	%	0	%

Shares Issued under ESPP	207,324		175,966		224,928

Stock-based Compensation Expense

Stock based compensation expense and other disclosures for stock based awards made to our employees pursuant to the equity plans was as follows:



	Year Ended December 31,
(in millions)	2019		2018		2017
Cost of providing services	$	8	$	10	$	8
Sales and marketing	3		8		6
General and administrative	28		22		14
Systems development and programming costs	2		4		4
Total stock based compensation expense	$	41	$	44	$	32
Total stock based compensation capitalized	$	1	$	—	$	—
Income tax benefit related to stock based compensation expense	$	11	$	11	$	7
Tax benefit realized from stock options exercised and similar awards	$	18	$	23	$	28

The table below summarizes unrecognized compensation expense for the year ended December 31, 2019 associated with the following:



	Amount (in millions)		Weighted-Average Period (in Years)
Nonvested stock options	$	—	0
Nonvested RSUs	51		2.27
Nonvested RSAs	2		0.49

Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Schedule of Common Stock

The following table shows the beginning and ending balances of our issued and outstanding common stock for the year ended December 31, 2019, 2018, and 2017:



	Year Ended December 31,
	2019		2018		2017
Shares issued and outstanding, beginning balance	70,596,559		69,818,392		69,015,690
Issuance of common stock from vested restricted stock units	1,036,119		1,634,271		1,020,352
Issuance of common stock from exercise of stock options	187,504		617,157		1,441,957
Issuance of common stock for employee stock purchase plan	207,324		175,966		224,928
Repurchase of common stock	(2,510,376	)	(1,190,995	)	(1,549,434	)
Awards effectively repurchased for required employee withholding taxes	(451,639	)	(458,232	)	(335,101	)
Shares issued and outstanding, ending balance	69,065,491		70,596,559		69,818,392

Schedule of Stock Repurchase

The following table summarizes the share repurchases under this program for the years ended December 31, 2019, 2018 and 2017:



	Year Ended December 31,
(in millions, except per share data)	2019		2018		2017
Total cost	$	140	$	61	$	44
Total shares	2,510,376		1,190,995		1,549,434
Average price per share	$	55.64	$	51.22	$	34.46

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Provision for Income Taxes

The provision for income taxes consists of the following:



	Year Ended December 31,
(in millions)	2019			2018			2017
Current:
Federal	$	53		$	41		$	46
State	12			7			1
Total Current	65			48			47
Deferred:
Federal	(2		)	(3		)	12
State	(5		)	4			3
Revaluation due to legislative changes	—			—			(40		)
Total Deferred	(7		)	1			(25		)
Total	$	58		$	49		$	22

U.S. Federal Statutory Income Tax Rate Reconciled to Effective Tax Rate

The U.S. federal statutory income tax rate reconciled to our effective tax rate is as follows:



	Year Ended December 31,
	2019							2018							2017
(in millions, except percent)	Pre-Tax Income		Tax Expense/(Benefit)			Percent of Pre-Tax Income (Loss)		Pre-Tax Income		Tax Expense/(Benefit)			Percent of Pre-Tax Income (Loss)		Pre-Tax Income		Tax Expense/(Benefit)			Percent of Pre-Tax Income (Loss)
	$	270						$	241						$	200
U.S. federal statutory tax rate			$	57		21	%			$	51		21	%			$	70		35	%
State income taxes, net of federal benefit			20			7				18			8				10			5
Tax rate change			—			—				—			—				(40		)	(20	)
Nondeductible meals, entertainment and penalties			1			—				1			—				1			—
Stock based compensation			(1		)	—				(9		)	(4	)			(15		)	(7	)
Uncertain tax positions			—			—				1			—				4			2
Tax credits			(7		)	(3	)			(5		)	(2	)			(4		)	(2	)
State and tax return to provision adjustments			(8		)	(3	)			(7		)	(3	)			(5		)	(3	)
Sec 199 benefits			(1		)	—				—			—				(3		)	(1	)
Other			(3		)	(1	)			(1		)	—				4			2
Total			$	58		21	%			$	49		20	%			$	22		11	%

Significant Components of Deferred Tax Assets and Liabilities

Significant components of our deferred tax assets and liabilities are as follows:



	Year Ended December 31,
(in millions)	2019			2018
Deferred tax assets:
Net operating losses (federal and state)	$	3		$	3
Accrued expenses	10			8
Accrued workers' compensation costs	9			9
Stock based compensation	3			8
Tax benefits relating to uncertain positions	1			—
Tax credits (federal and state)	7			7
Total	33			35
Valuation allowance	(5		)	(7		)
Total deferred tax assets	28			28
Deferred tax liabilities:
Depreciation and amortization	(27		)	(24		)
Deferred service revenues	(41		)	(62		)
Prepaid health plan expenses	(1		)	—
Prepaid commission expenses	(19		)	(9		)
Total deferred tax liabilities	(88		)	(95		)
Net deferred tax liabilities	$	(60	)	$	(67	)

Reconciliation of Beginning and Ending Valuation Allowance

A reconciliation of the beginning and ending amount of the valuation allowance is presented in the table below:



	Year Ended December 31,
(in millions)	2019			2018		2017
Valuation allowance at January 1	$	7		$	7	$	6
Credited/ charged to net income	(2		)	—		1
Valuation allowance at December 31	5			7		7

Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits (excluding interest and penalties) is presented in the table below:



	Year Ended December 31,
(in millions)	2019			2018			2017
Unrecognized tax benefits at January 1	$	6		$	6		$	1
Additions for tax positions of prior periods	1			1			4
Additions for tax positions of current period	1			—			1
Reductions for tax positions of prior period:
Lapse of applicable statute of limitations	(1		)	(1		)	—
Unrecognized tax benefits at December 31	$	7		$	6		$	6

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Computation of Basic and Diluted EPS

The following table presents the computation of our basic and diluted EPS attributable to our common stock:



	Year Ended December 31,
(in millions, except per share data)	2019		2018		2017
Net income	$	212	$	192	$	178
Weighted average shares of common stock outstanding	70		70		69
Basic EPS	$	3.04	$	2.72	$	2.57

Net income	$	212	$	192	$	178
Weighted average shares of common stock outstanding	70		70		69
Dilutive effect of stock options and restricted stock units	1		2		2
Weighted average shares of common stock outstanding	71		72		71
Diluted EPS	$	2.99	$	2.65	$	2.49

Common stock equivalents excluded from income per diluted share because of their anti-dilutive effect	1		1		2

Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Schedule of Selected Quarterly Financial Data



	Quarter ended
(in millions, except per share data)	March 31		June 30		September 30		December 31
2019
Total revenues	$	934	$	935	$	969	$	1,018
Insurance costs	683		704		748		792
Operating income	82		55		68		63
Net income	63		46		55		48
Basic net income per share	$	0.91	$	0.65	$	0.80	$	0.69
Diluted net income per share	$	0.89	$	0.64	$	0.78	$	0.68
2018
Total revenues	$	861	$	850	$	875	$	917
Insurance costs	641		630		647		692
Operating income	71		76		62		42
Net income	54		58		51		29
Basic net income per share	$	0.77	$	0.82	$	0.73	$	0.41
Diluted net income per share	$	0.75	$	0.80	$	0.71	$	0.40

Description of Business and Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) segment reporting_unit	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2018 USD ($)
Summary Of Significant Accounting Policy [Line Items]
Number of reporting units \| reporting_unit	1
Number of reportable segments \| segment	1
Accumulated deficit	$ (219,000,000)	$ (266,000,000)
Advance collection	95,000,000	23,000,000
Maximum reimbursement per claim occurrence	$ 1,000,000
Plan years to be settled	10 years
Prepaid Insurance	$ 39,000,000	33,000,000
Weighted-average rate used in discounting the lease liabilities	4.40%
Accounts receivable allowance for doubtful accounts	$ 0	1,000,000
Impairment of goodwill	0	0	$ 0
Impairment of finite-lived intangible assets	0	0	0
Advertising costs	18,000,000	17,000,000	8,000,000
Bad debt expense net of recoveries	$ 1,000,000	1,000,000	$ 1,000,000
Minimum
Summary Of Significant Accounting Policy [Line Items]
Estimated useful life of intangible assets	2 years
Minimum \| Software Development
Summary Of Significant Accounting Policy [Line Items]
Estimated useful life of intangible assets	3 years
Minimum \| Software And Office Equipment
Summary Of Significant Accounting Policy [Line Items]
Estimated useful life of property and equipment	3 years
Minimum \| Furniture, fixtures, and equipment
Summary Of Significant Accounting Policy [Line Items]
Estimated useful life of property and equipment	5 years
Maximum
Summary Of Significant Accounting Policy [Line Items]
Estimated useful life of intangible assets	10 years
Maximum \| Software Development
Summary Of Significant Accounting Policy [Line Items]
Estimated useful life of intangible assets	5 years
Maximum \| Software And Office Equipment
Summary Of Significant Accounting Policy [Line Items]
Estimated useful life of property and equipment	5 years
Maximum \| Furniture, fixtures, and equipment
Summary Of Significant Accounting Policy [Line Items]
Estimated useful life of property and equipment	7 years
Non-US \| Geographic Concentration Risk \| Revenue
Summary Of Significant Accounting Policy [Line Items]
Concentration risk percentage	1.00%
Health Care
Summary Of Significant Accounting Policy [Line Items]
Prepaid Insurance	$ 52,000,000	$ 50,000,000
Difference between Revenue Guidance in Effect before and after Topic 606 \| Accounting Standards Update 2014-09
Summary Of Significant Accounting Policy [Line Items]
Accumulated deficit				$ 2,000,000

Description of Business and Significant Accounting Policies - Summary of Amounts Capitalized and Amortized (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Capitalized deferred commission costs	$ 45	$ 33
Amortized deferred commission costs	$ 10	$ 2

Description of Business and Significant Accounting Policies - Adoption of ASU 2016-02 (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncement, Early Adoption [Line Items]
Operating lease right-of-use assets	$ 55
Operating lease liabilities	17
Operating lease liabilities, noncurrent	48
Accumulated deficit	(219)	$ (266)
Calculated Under Guidance In Effect Before Topic 842
New Accounting Pronouncement, Early Adoption [Line Items]
Operating lease liabilities, noncurrent	10
Accumulated deficit	(219)
Accounting Standards Update 2016-02 \| Difference Between Guidance In Effect Before And After Topic 842
New Accounting Pronouncement, Early Adoption [Line Items]
Operating lease right-of-use assets	55
Operating lease liabilities	17
Operating lease liabilities, noncurrent	38
Accumulated deficit	$ 0

Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	$ 213	$ 228
Short-term Investments	68	54
Restricted cash, cash equivalents and investments	1,180	942
Investments, noncurrent	125	135
Collateral for workers' compensation claims	212	187
Total	1,798	1,546
Payroll funds collected
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	1,018	783
Collateral for health benefits claims
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	98	75
Collateral for workers' compensation claims
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	62	67
Collateral for workers' compensation claims	212	187
Collateral to secure standby letter of credit
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	0	2
Other security deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	2	15
Cash and cash equivalents
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	213	228
Short-term Investments	0	0
Restricted cash, cash equivalents and investments	1,180	939
Investments, noncurrent	0	0
Total	1,456	1,349
Cash and cash equivalents \| Payroll funds collected
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	1,018	783
Cash and cash equivalents \| Collateral for health benefits claims
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	98	75
Cash and cash equivalents \| Collateral for workers' compensation claims
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	62	66
Collateral for workers' compensation claims	63	182
Cash and cash equivalents \| Collateral to secure standby letter of credit
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	0	0
Cash and cash equivalents \| Other security deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	2	15
Available for sale marketable securities
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	0	0
Short-term Investments	68	54
Restricted cash, cash equivalents and investments	0	1
Investments, noncurrent	125	135
Total	341	195
Available for sale marketable securities \| Payroll funds collected
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	0	0
Available for sale marketable securities \| Collateral for health benefits claims
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	0	0
Available for sale marketable securities \| Collateral for workers' compensation claims
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	0	1
Collateral for workers' compensation claims	148	5
Available for sale marketable securities \| Collateral to secure standby letter of credit
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	0	0
Available for sale marketable securities \| Other security deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	0	0
Certificate of deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Cash and cash equivalents	0	0
Short-term Investments	0	0
Restricted cash, cash equivalents and investments	0	2
Investments, noncurrent	0	0
Total	1	2
Certificate of deposits \| Payroll funds collected
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	0	0
Certificate of deposits \| Collateral for health benefits claims
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	0	0
Certificate of deposits \| Collateral for workers' compensation claims
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	0	0
Collateral for workers' compensation claims	1	0
Certificate of deposits \| Collateral to secure standby letter of credit
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	0	2
Certificate of deposits \| Other security deposits
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash, cash equivalents and investments	$ 0	$ 0

Investments - Amortized Cost, Gross Unrealized Gains and Losses, Fair Values of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt and Equity Securities
Amortized Cost	$ 341	$ 195
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	0
Fair Value	342	195
Asset-backed securities
Debt Securities
Amortized Cost	30	33
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	30	33
Corporate bonds
Debt Securities
Amortized Cost	123	99
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	0
Fair Value	124	99
U.S. government agencies and government-sponsored agencies
Debt Securities
Amortized Cost	14	7
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	14	7
U.S. treasuries
Debt Securities
Amortized Cost	163	46
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	163	46
Exchange traded fund
Equity Securities
Amortized Cost	0	1
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	0	1
Certificate of deposit
Debt Securities
Amortized Cost	1	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	1	0
Other debt securities
Debt Securities
Amortized Cost	10	9
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 10	$ 9

Investments - Fair Value of Debt Investments by Contractual Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
One year or less	$ 80	$ 59
Over one year through five years	237	120
Over five years through ten years	8	3
Over ten years	17	12
Total fair value	$ 342	$ 194

Investments Investments - Gross Proceeds from AFS debt securities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Gross proceeds from sales	$ 76	$ 54	$ 0
Gross proceeds from maturities	83	47	14
Total	$ 159	$ 101	$ 14

Financial Instruments and Fair Value Measurements - Fair Value Measurements on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Total	$ 1,798	$ 1,546
Certificate of deposit
Debt Securities, Available-for-sale [Line Items]
Total	1	2
Fair Value Measurements on a Recurring Basis
Debt Securities, Available-for-sale [Line Items]
Cash equivalents	92	5
Investments	194	189
Restricted cash equivalents	70	68
Restricted investments	148	8
Total	504	270
Fair Value Measurements on a Recurring Basis \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Investments	30	33
Fair Value Measurements on a Recurring Basis \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Investments	96	99
Restricted investments	28
Fair Value Measurements on a Recurring Basis \| U.S. government agencies and government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Investments	5	7
Restricted investments	9
Fair Value Measurements on a Recurring Basis \| U.S. treasuries
Debt Securities, Available-for-sale [Line Items]
Investments	53	41
Restricted investments	110	5
Fair Value Measurements on a Recurring Basis \| Other debt securities
Debt Securities, Available-for-sale [Line Items]
Investments	10	9
Fair Value Measurements on a Recurring Basis \| Exchange traded fund
Debt Securities, Available-for-sale [Line Items]
Restricted investments		1
Fair Value Measurements on a Recurring Basis \| Certificate of deposit
Debt Securities, Available-for-sale [Line Items]
Restricted cash equivalents	2
Restricted investments	1	2
Fair Value Measurements on a Recurring Basis \| Level 1
Debt Securities, Available-for-sale [Line Items]
Cash equivalents	89	4
Investments	0	0
Restricted cash equivalents	56	68
Restricted investments	0	1
Total	145	73
Fair Value Measurements on a Recurring Basis \| Level 1 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Investments	0	0
Fair Value Measurements on a Recurring Basis \| Level 1 \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Investments	0	0
Restricted investments	0
Fair Value Measurements on a Recurring Basis \| Level 1 \| U.S. government agencies and government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Investments	0	0
Restricted investments	0
Fair Value Measurements on a Recurring Basis \| Level 1 \| U.S. treasuries
Debt Securities, Available-for-sale [Line Items]
Investments	0	0
Restricted investments	0	0
Fair Value Measurements on a Recurring Basis \| Level 1 \| Other debt securities
Debt Securities, Available-for-sale [Line Items]
Investments	0	0
Fair Value Measurements on a Recurring Basis \| Level 1 \| Exchange traded fund
Debt Securities, Available-for-sale [Line Items]
Restricted investments		1
Fair Value Measurements on a Recurring Basis \| Level 1 \| Certificate of deposit
Debt Securities, Available-for-sale [Line Items]
Restricted cash equivalents	0
Restricted investments	0	0
Fair Value Measurements on a Recurring Basis \| Level 2
Debt Securities, Available-for-sale [Line Items]
Cash equivalents	3	1
Investments	194	189
Restricted cash equivalents	14	0
Restricted investments	148	7
Total	359	197
Fair Value Measurements on a Recurring Basis \| Level 2 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Investments	30	33
Fair Value Measurements on a Recurring Basis \| Level 2 \| Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Investments	96	99
Restricted investments	28
Fair Value Measurements on a Recurring Basis \| Level 2 \| U.S. government agencies and government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Investments	5	7
Restricted investments	9
Fair Value Measurements on a Recurring Basis \| Level 2 \| U.S. treasuries
Debt Securities, Available-for-sale [Line Items]
Investments	53	41
Restricted investments	110	5
Fair Value Measurements on a Recurring Basis \| Level 2 \| Other debt securities
Debt Securities, Available-for-sale [Line Items]
Investments	10	9
Fair Value Measurements on a Recurring Basis \| Level 2 \| Exchange traded fund
Debt Securities, Available-for-sale [Line Items]
Restricted investments		0
Fair Value Measurements on a Recurring Basis \| Level 2 \| Certificate of deposit
Debt Securities, Available-for-sale [Line Items]
Restricted cash equivalents	2
Restricted investments	1	2
Money market mutual funds \| Fair Value Measurements on a Recurring Basis
Debt Securities, Available-for-sale [Line Items]
Cash equivalents	89	4
Restricted cash equivalents	42	48
Money market mutual funds \| Fair Value Measurements on a Recurring Basis \| Level 1
Debt Securities, Available-for-sale [Line Items]
Cash equivalents	89	4
Restricted cash equivalents	42	48
Money market mutual funds \| Fair Value Measurements on a Recurring Basis \| Level 2
Debt Securities, Available-for-sale [Line Items]
Cash equivalents	0	0
Restricted cash equivalents	0	0
U.S. treasuries \| Fair Value Measurements on a Recurring Basis
Debt Securities, Available-for-sale [Line Items]
Cash equivalents	3	1
Restricted cash equivalents	12
U.S. treasuries \| Fair Value Measurements on a Recurring Basis \| Level 1
Debt Securities, Available-for-sale [Line Items]
Cash equivalents	0	0
Restricted cash equivalents	0
U.S. treasuries \| Fair Value Measurements on a Recurring Basis \| Level 2
Debt Securities, Available-for-sale [Line Items]
Cash equivalents	3	1
Restricted cash equivalents	12
Commercial Paper \| Fair Value Measurements on a Recurring Basis
Debt Securities, Available-for-sale [Line Items]
Restricted cash equivalents	14	20
Commercial Paper \| Fair Value Measurements on a Recurring Basis \| Level 1
Debt Securities, Available-for-sale [Line Items]
Restricted cash equivalents	14	20
Commercial Paper \| Fair Value Measurements on a Recurring Basis \| Level 2
Debt Securities, Available-for-sale [Line Items]
Restricted cash equivalents	$ 0	$ 0

Financial Instruments and Fair Value Measurements - Fair Value (Details) $ in Millions	Dec. 31, 2019 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notional amount	$ 213
Other current assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Market Value	0
Accounts payable and other current liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Market Value	$ 0

PROPERTY, EQUIPMENT AND SOFTWARE, NET (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 245	$ 209
Less: Accumulated depreciation	(160)	(130)
Property and equipment, net	85	79
Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	174	144
Office equipment, including data processing equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	27	27
Leasehold improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	24	21
Furniture, fixtures, and equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	17	15
Projects in progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 3	$ 2

PROPERTY, EQUIPMENT AND SOFTWARE, NET - Depreciation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 41	$ 35	$ 28
Capitalized internally developed software costs	31	33	29
Depreciation expense for capitalized internally developed software costs	$ 29	$ 24	$ 17

Goodwill and Other Intangible Assets - Summary of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill
Gross Carrying Amount	$ 289	$ 289
Net Carrying Amount	289	289
Amortizable intangibles:
Gross Carrying Amount	95	95
Accumulated Amortization	(80)	(74)
Net Carrying Amount	15	21
Amortization of intangible assets	$ 5	5	$ 5
Customer contracts
Amortizable intangibles:
Weighted Average Amortization Period	10 years
Gross Carrying Amount	$ 90	90
Accumulated Amortization	(76)	(71)
Net Carrying Amount	$ 14	19
Developed technology
Amortizable intangibles:
Weighted Average Amortization Period	5 years
Gross Carrying Amount	$ 5	5
Accumulated Amortization	(4)	(3)
Net Carrying Amount	$ 1	$ 2

Goodwill and Other Intangible Assets - Expected Expense Related to Intangibles Amortization in Future Periods (Details) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
2020	$ 5
2021	4
2022	4
2023	2
Net Carrying Amount	$ 15	$ 21

Accrued Workers' Compensation Costs - Summary of Activities in Liability for Unpaid Claims and Claims Adjustment Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Liability for Unpaid Claims and Claims Adjustment Expense
Total accrued costs, beginning of year	$ 238	$ 255	$ 255
Incurred
Current year	72	80	98
Prior years	(31)	(28)	(6)
Total incurred	41	52	92
Paid
Current year	(14)	(12)	(14)
Prior years	(51)	(57)	(78)
Total paid	(65)	(69)	(92)
Total accrued costs, end of year	$ 214	$ 238	$ 255

Accrued Workers' Compensation Costs - Summary of Workers' Compensation Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Liability for Claims and Claims Adjustment Expense [Line Items]
Total accrued costs, end of year	$ 214	$ 238	$ 255	$ 255
Collateral paid to carriers and offset against accrued costs	(9)	(13)
Total loss reserves, net of carrier collateral offset	205	225
Accrued workers' compensation costs, net	61	67
Payable in more than 1 year	144	158
Collateral paid, current	3	3
Collateral paid, noncurrent	6	10
WSE
Liability for Claims and Claims Adjustment Expense [Line Items]
Total loss reserves, net of carrier collateral offset	205	225
Accrued workers' compensation costs, net	61	67
Payable in more than 1 year	$ 144	$ 158

Accrued Workers' Compensation Costs - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Insurance [Abstract]
Collateral held by insurance carriers	$ 46	$ 57
Collateral paid to carriers and offset against loss reserves	$ 9	$ 13

Leases - Narrative (Details) $ in Millions	12 Months Ended
Leases - Narrative (Details) $ in Millions	Dec. 31, 2019 USD ($)
Operating Leased Assets [Line Items]
Renewal term	15 years
Operating lease expense	$ 19
Operating lease payments	17
Total operating lease liability	$ 17
Lease term (in years)	6 years 1 month 6 days
Minimum
Operating Leased Assets [Line Items]
Term of contract (in years)	1 year
Maximum
Operating Leased Assets [Line Items]
Term of contract (in years)	9 years

Leases - Operating Lease Payments (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2020	$ 19
2021	11
2022	10
2023	9
2024	6
2025 and thereafter	19
Total future minimum lease payments	74
Less: imputed interest	(9)
Total operating lease liabilities	65
Current portion	17
Non-current portion	$ 48
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019		$ 18
2020		17
2021		11
2022		9
2023		8
2024		5
2025 and thereafter		20
Total future minimum lease payments		$ 88

Long-Term Debt - Components of Notes Payable (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Line of Credit Facility [Line Items]
Notes payable	$ 392	$ 414
Deferred loan costs	(1)	(1)
Less: current portion	(22)	(22)
Long-term debt, noncurrent	$ 369	$ 391
Annual Contractual Interest Rate	3.42%	4.15%
Effective Interest Rate	3.52%	4.25%
Notes Payable \| 2018 Term Loan A
Line of Credit Facility [Line Items]
Notes payable	$ 392	$ 414

Long-Term Debt - Narrative (Details) - USD ($)	12 Months Ended
Long-Term Debt - Narrative (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2018
Debt Instrument [Line Items]
Interest Rate	3.52%	4.25%
2018 Term Loan A \| Notes Payable
Debt Instrument [Line Items]
New term loan			$ 425,000,000
2018 Term Loan A \| Notes Payable \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate	1.625%
2018 Term Loan A \| Notes Payable \| Prime lending rate
Debt Instrument [Line Items]
Spread on variable rate	0.625%
2018 Revolver \| Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility amount	$ 250,000,000
Letters of credit outstanding	16,000,000
Unused portion of credit facility	234,000,000
2018 Revolver \| Swingline loan \| Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility amount	$ 20,000,000

Long-Term Debt - Aggregate Annual Term Loan Repayments (Details) - Notes Payable - 2018 Term Loan A $ in Millions	Dec. 31, 2019 USD ($)
Line of Credit Facility [Line Items]
2020	$ 22
2021	22
2022	22
2023	326
2024	0
Thereafter	$ 0

Stock Based Compensation - Narrative (Details) shares in Millions	12 Months Ended
	Dec. 31, 2019 shares
Additional Disclosures for equity-based plans
Shares available for grant (in shares)	3
Stock Options
Additional Disclosures for equity-based plans
Vesting period	4 years
Time-based RSUs and RSAs
Additional Disclosures for equity-based plans
Vesting period	4 years
Time-based RSUs and RSAs \| Minimum
Additional Disclosures for equity-based plans
Percent of share value	0.00%
Time-based RSUs and RSAs \| Maximum
Additional Disclosures for equity-based plans
Percent of share value	200.00%
Employee Stock
Additional Disclosures for equity-based plans
Shares available for grant (in shares)	3
Common Class A \| Stock Options \| Maximum
Additional Disclosures for equity-based plans
Contractual term	10 years
Employee Stock Purchase Plan
Additional Disclosures for equity-based plans
Stock options granted percentage of fair market value on offering date	85.00%
Stock options granted percentage of fair market value on purchase date	85.00%
Share-based Payment Arrangement, Tranche One \| Performance-based RSUs and RSAs
Additional Disclosures for equity-based plans
Vesting period	1 year
Amount of shares that are expected to vest (as a percent )	50.00%

Stock Based Compensation - Summary Of Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Balance (in shares)	655,515
Exercised (in shares)	(187,504)
Expired (in shares)	(6,000)
Balance (in shares)	462,011	655,515
Exercisable (in shares)	462,011
Vested and expected to vest (in shares)	462,011
Weighted Average Exercise Price
Balance (in dollars per share)	$ 12.90
Exercised (in dollars per share)	10.80
Expired (in dollars per share)	0.50
Balance (in dollars per share)	13.90	$ 12.90
Exercisable (in dollars per share)	13.90
Vested and expected to vest (in dollars per share)	$ 13.90
Balance (in years)	4 years 7 days	4 years 10 months 28 days
Exercisable (in years)	4 years 7 days
Vested and expected to vest ( in years)	4 years 7 days
Aggregate Intrinsic Value, Balance	$ 20	$ 19
Aggregate Intrinsic Value, Exercisable	20
Aggregate Intrinsic Value, Vested and expected to vest	$ 20

Stock Based Compensation - Additional Disclosure for Stock Options (Details) - Stock Options - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Additional Disclosures for equity-based plans
Total fair value of options vested	$ 1	$ 4	$ 7
Total intrinsic value of options exercised	9	24	36
Cash received from options exercised	$ 2	$ 7	$ 11

Stock Based Compensation - Summary Of RSU And RSA Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Time-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance (in shares)	1,560,685
Granted (in shares)	616,224
Vested (in shares)	(891,633)
Forfeited (in shares)	(180,547)
Balance (in shares)	1,104,729	1,560,685
Time-Based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance (in shares)	98,445
Granted (in shares)	0
Vested (in shares)	(37,309)
Forfeited (in shares)	0
Balance (in shares)	61,136	98,445
Time-based RSUs and RSAs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance (in shares)	1,659,130
Granted (in shares)		616,224
Vested (in shares)		(928,942)
Forfeited (in shares)	(180,547)
Balance (in shares)	1,165,865	1,659,130
Weighted-Average Grant Date Fair Value
Balance (in dollars per share)	$ 33.88
Granted (in dollars per share)		$ 60.99
Vested (in dollars per share)		32.53
Forfeited (in dollars per share)	38.89
Balance (in dollars per share)	$ 48.47	$ 33.88
Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance (in shares)	176,869
Granted (in shares)	83,110
Vested (in shares)	(155,589)
Cancelled (in shares)	(61,400)
Forfeited (in shares)	(27,238)
Balance (in shares)	15,752	176,869
Performance-Based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance (in shares)	248,347
Granted (in shares)	0
Vested (in shares)	(122,387)
Cancelled (in shares)	0
Forfeited (in shares)	(11,103)
Balance (in shares)	114,857	248,347
Performance-based RSUs and RSAs
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance (in shares)	425,216
Granted (in shares)	83,110
Vested (in shares)	(277,976)
Cancelled (in shares)	(61,400)
Forfeited (in shares)	(38,341)
Balance (in shares)	130,609	425,216
Weighted-Average Grant Date Fair Value
Balance (in dollars per share)	$ 42.02
Granted (in dollars per share)	59.83
Vested (in dollars per share)	39.45
Cancelled (in dollars per share)	61.75
Forfeited (in dollars per share)	41.52
Balance (in dollars per share)	$ 49.70	$ 42.02

Stock Based Compensation - Additional Disclosures for Equity Based Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Additional Disclosures for equity-based plans
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees (in shares)	451,639	458,232	335,101
Time-based RSUs and RSAs
Additional Disclosures for equity-based plans
Total grant date fair value of shares granted (in millions)	$ 38	$ 38	$ 37
Total grant date fair value of shares vested (in millions)	$ 30	$ 28	$ 21
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees (in shares)	315,762	348,010	332,857
Performance-based RSUs and RSAs
Additional Disclosures for equity-based plans
Total grant date fair value of shares granted (in millions)	$ 4	$ 14	$ 10
Total grant date fair value of shares vested (in millions)	$ 11	$ 7	$ 0
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees (in shares)	135,877	110,222	2,244

Stock Based Compensation - Weighted-Average Assumptions Used to Estimate Fair Value of Stock Options (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Additional Disclosures for equity-based plans
Expected Term (in Years)			15 days
Expected Dividend Yield	0.00%	0.00%	0.00%
Shares Issued under ESPP	207,324	175,966	224,928
Minimum
Additional Disclosures for equity-based plans
Expected Volatility	27.00%	27.00%	28.00%
Risk-Free Interest Rate	1.60%	1.42%	0.62%
Maximum
Additional Disclosures for equity-based plans
Expected Volatility	42.00%	37.00%	37.00%
Risk-Free Interest Rate	2.50%	2.50%	1.42%

Stock Based Compensation - Stock Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Additional Disclosures for equity-based plans
Total stock based compensation expense	$ 41	$ 44	$ 32
Total stock based compensation capitalized	1	0	0
Income tax benefit related to stock based compensation expense	11	11	7
Tax benefit realized from stock options exercised and similar awards	18	23	28
Cost of providing services
Additional Disclosures for equity-based plans
Total stock based compensation expense	8	10	8
Sales and marketing
Additional Disclosures for equity-based plans
Total stock based compensation expense	3	8	6
General and administrative
Additional Disclosures for equity-based plans
Total stock based compensation expense	28	22	14
Systems development and programming costs
Additional Disclosures for equity-based plans
Total stock based compensation expense	$ 2	$ 4	$ 4

Stock Based Compensation - Summary of Unrecognized Compensation Expense (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Stock Options
Additional Disclosures for equity-based plans
Unrecognized compensation expense of options, net of forfeitures	$ 0
Unrecognized compensation expense, expected to be recognized over a weighted-average period (in years)	0 years
RSUs
Additional Disclosures for equity-based plans
Unrecognized compensation expense of awards other than options, net of forfeitures	$ 51
Unrecognized compensation expense, expected to be recognized over a weighted-average period (in years)	2 years 3 months 7 days
RSAs
Additional Disclosures for equity-based plans
Unrecognized compensation expense of awards other than options, net of forfeitures	$ 2
Unrecognized compensation expense, expected to be recognized over a weighted-average period (in years)	14 days

Stockholders' Equity (Details) - shares	12 Months Ended
Stockholders' Equity (Details) - shares	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued and outstanding, beginning balance (in shares)	70,596,559	69,818,392	69,015,690
Issuance of common stock from exercise of stock options (in shares)	187,504
Shares issued under ESPP (in shares)	207,324	175,966	224,928
Repurchase of common stock (in shares)	(2,510,376)	(1,190,995)	(1,549,434)
Awards effectively repurchased for required employee withholding taxes (in shares)	(451,639)	(458,232)	(335,101)
Shares issued and outstanding, ending balance (in shares)	69,065,491	70,596,559	69,818,392
Restricted Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from vested restricted stock units (in shares)	1,036,119	1,634,271	1,020,352
Equity Option
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from exercise of stock options (in shares)	187,504	617,157	1,441,957
Employee Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under ESPP (in shares)	207,324	175,966	224,928

Stockholders' Equity - Narrative (Details) - USD ($)	Dec. 31, 2019	Feb. 06, 2019
Equity [Abstract]
Stock repurchase		$ 300,000,000
Remaining authorized amount available for repurchase	$ 236,000,000

Stockholders' Equity - Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Total cost	$ 140	$ 61	$ 44
Total shares (in shares)	2,510,376	1,190,995	1,549,434
Average price per share (in dollars per share)	$ 55.64	$ 51.22	$ 34.46

Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 53	$ 41	$ 46
State	12	7	1
Total Current	65	48	47
Deferred:
Federal	(2)	(3)	12
State	(5)	4	3
Revaluation due to state legislative changes	0	0	(40)
Total Deferred	(7)	1	(25)
Total	$ 58	$ 49	$ 22

Income Taxes - U.S. Federal Statutory Income Tax Rate Reconciled to Effective Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Pre-Tax Income	$ 270	$ 241	$ 200
Tax Expense/(Benefit)
U.S. federal statutory tax rate	57	51	70
State income taxes, net of federal benefit	20	18	10
Tax rate change	0	0	(40)
Nondeductible meals, entertainment and penalties	1	1	1
Stock based compensation	(1)	(9)	(15)
Uncertain tax positions	0	1	4
Tax credits	(7)	(5)	(4)
State and tax return to provision adjustments	(8)	(7)	(5)
Sec 199 benefits	(1)	0	(3)
Other	(3)	(1)	4
Total	$ 58	$ 49	$ 22
Percent of Pre-Tax Income (Loss)
U.S. federal statutory tax rate	21.00%	21.00%	35.00%
State income taxes, net of federal benefit	7.00%	8.00%	5.00%
Tax rate change	0.00%	0.00%	(20.00%)
Nondeductible meals, entertainment and penalties	0.00%	0.00%	0.00%
Stock based compensation	0.00%	(4.00%)	(7.00%)
Uncertain tax positions	0.00%	0.00%	2.00%
Tax credits	(3.00%)	(2.00%)	(2.00%)
State and tax return to provision adjustments	(3.00%)	(3.00%)	(3.00%)
Sec 199 benefits	0.00%	0.00%	(1.00%)
Other	(1.00%)	0.00%	2.00%
Total	21.00%	20.00%	11.00%

Income Taxes - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Millions	Jan. 18, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes Disclosure [Line Items]
Increase in effective income tax rate		1.00%
Effective income tax rate		21.00%	20.00%	11.00%
Effect of revaluation of deferred taxes		0.00%	0.00%	20.00%
Valuation allowance related to tax credit carryforwards		$ 4	$ 6
Excess tax benefits		11	11	$ 7
Employment tax credit disallowed		7	5	4
Unrecognized tax benefits		7	6	$ 6	$ 1
State and Local Jurisdiction
Income Taxes Disclosure [Line Items]
Net operating loss carryforwards		53	61
State tax credit carryforwards		6	$ 7
Internal Revenue Service
Income Taxes Disclosure [Line Items]
Employment tax credit disallowed		11
Income tax examination, penalties and interest expense		4
Recovery of disallowed tax credits	$ 15
2019 Equity Incentive Plan
Income Taxes Disclosure [Line Items]
Excess tax benefits		$ 8

Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Net operating losses (federal and state)	$ 3	$ 3
Accrued expenses	10	8
Accrued workers' compensation costs	9	9
Stock based compensation	3	8
Tax benefits relating to uncertain positions	1	0
Tax credits (federal and state)	7	7
Total	33	35
Valuation allowance	(5)	(7)	$ (7)	$ (6)
Total deferred tax assets	28	28
Deferred tax liabilities:
Depreciation and amortization	(27)	(24)
Deferred service revenues	(41)	(62)
Prepaid health plan expenses	(1)	0
Prepaid commission expenses	(19)	(9)
Total deferred tax liabilities	(88)	(95)
Net deferred tax liabilities	$ (60)	$ (67)

Income Taxes - Reconciliation of Beginning and Ending Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Valuation allowance at January 1	$ 7	$ 7	$ 6
Credited/ charged to net income	(2)	0	1
Valuation allowance at December 31	$ 5	$ 7	$ 7

Income Taxes - Reconciliation of Beginning and Ending Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits at January 1	$ 6	$ 6	$ 1
Additions for tax positions of prior periods	1	1	4
Additions for tax positions of current period	1	0	1
Lapse of applicable statute of limitations	(1)	(1)	0
Unrecognized tax benefits at December 31	$ 7	$ 6	$ 6

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 48	$ 55	$ 46	$ 63	$ 29	$ 51	$ 58	$ 54	$ 212	$ 192	$ 178
Weighted average shares of common stock outstanding									70	70	69
Basic (in dollars per share)	$ 0.69	$ 0.80	$ 0.65	$ 0.91	$ 0.41	$ 0.73	$ 0.82	$ 0.77	$ 3.04	$ 2.72	$ 2.57
Net income	$ 48	$ 55	$ 46	$ 63	$ 29	$ 51	$ 58	$ 54	$ 212	$ 192	$ 178
Dilutive effect of stock options and restricted stock units									1	2	2
Weighted average shares of common stock outstanding									71	72	71
Diluted (in dollars per share)	$ 0.68	$ 0.78	$ 0.64	$ 0.89	$ 0.40	$ 0.71	$ 0.80	$ 0.75	$ 2.99	$ 2.65	$ 2.49
Common stock equivalents excluded from income per diluted share because of their anti-dilutive effect									1	1	2

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

401(k) Plan (Details) - USD ($) $ in Millions	12 Months Ended
401(k) Plan (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Postemployment Benefits [Abstract]
Company match, employee contributions	$ 14	$ 11	$ 6

Related Party Transactions - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Revenue from related parties	$ 25	$ 20	$ 22
Board of Directors Chairman
Related Party Transaction [Line Items]
Payments to service providers with common board members	$ 10	$ 5	$ 6

Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 1,018	$ 969	$ 935	$ 934	$ 917	$ 875	$ 850	$ 861	$ 3,856	$ 3,503	$ 3,275
Insurance costs	792	748	704	683	692	647	630	641	2,927	2,610	2,466
Operating income	63	68	55	82	42	62	76	71	268	251	217
Net income	$ 48	$ 55	$ 46	$ 63	$ 29	$ 51	$ 58	$ 54	$ 212	$ 192	$ 178
Basic net income per share (in dollars per share)	$ 0.69	$ 0.80	$ 0.65	$ 0.91	$ 0.41	$ 0.73	$ 0.82	$ 0.77	$ 3.04	$ 2.72	$ 2.57
Diluted net income per share (in dollars per share)	$ 0.68	$ 0.78	$ 0.64	$ 0.89	$ 0.40	$ 0.71	$ 0.80	$ 0.75	$ 2.99	$ 2.65	$ 2.49

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Label	Element	Value
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 2,000,000
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 0