Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2018	Oct. 26, 2018
Entity Information
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Trading Symbol	FB
Entity Registrant Name	Facebook Inc
Entity Central Index Key	0001326801
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Class A Common Stock
Entity Information
Entity Common Stock, Shares Outstanding		2,402,466,211
Class B Common Stock
Entity Information
Entity Common Stock, Shares Outstanding		471,321,401

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 9,637	$ 8,079
Marketable securities	31,569	33,632
Accounts receivable, net of allowances of $207 and $189 as of September 30, 2018 and December 31, 2017, respectively	6,058	5,832
Prepaid expenses and other current assets	1,883	1,020
Total current assets	49,147	48,563
Property and equipment, net	21,112	13,721
Intangible assets, net	1,451	1,884
Goodwill	18,304	18,221
Other assets	2,438	2,135
Total assets	92,452	84,524
Current liabilities:
Accounts payable	590	380
Partners payable	502	390
Accrued expenses and other current liabilities	4,255	2,892
Deferred revenue and deposits	115	98
Total current liabilities	5,462	3,760
Other liabilities	6,648	6,417
Total liabilities	12,110	10,177
Commitments and contingencies
Stockholders' equity:
Common stock, $0.000006 par value; 5,000 million Class A shares authorized, 2,402 million and 2,397 million shares issued and outstanding, as of September 30, 2018 and December 31, 2017, respectively; 4,141 million Class B shares authorized, 471 million and 509 million shares issued and outstanding, as of September 30, 2018 and December 31, 2017, respectively.	0	0
Additional paid-in capital	42,352	40,584
Accumulated other comprehensive loss	(777)	(227)
Retained earnings	38,767	33,990
Total stockholders' equity	80,342	74,347
Total liabilities and stockholders' equity	$ 92,452	$ 84,524

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Accounts receivable, allowances for doubtful accounts	$ 207	$ 189
Stockholders' equity:
Common stock, par value (in dollars per share)	$ 0.000006	$ 0.000006
Class A Common Stock
Stockholders' equity:
Common stock, shares authorized (in shares)	5,000,000,000	5,000,000,000
Common stock, shares issued (in shares)	2,402,000,000	2,397,000,000
Common stock, shares outstanding (in shares)	2,402,000,000	2,397,000,000
Class B Common Stock
Stockholders' equity:
Common stock, shares authorized (in shares)	4,141,000,000	4,141,000,000
Common stock, shares issued (in shares)	471,000,000	509,000,000
Common stock, shares outstanding (in shares)	471,000,000	509,000,000

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue	$ 13,727	$ 10,328	$ 38,924	$ 27,681
Costs and expenses:
Cost of revenue	2,418	1,448	6,559	3,843
Research and development	2,657	2,052	7,418	5,805
Marketing and sales	1,928	1,170	5,379	3,351
General and administrative	943	536	2,475	1,831
Total costs and expenses	7,946	5,206	21,831	14,830
Income from operations	5,781	5,122	17,093	12,851
Interest and other income, net	131	114	297	281
Income before provision for income taxes	5,912	5,236	17,390	13,132
Provision for income taxes	775	529	2,160	1,467
Net income	5,137	4,707	15,230	11,665
Less: Net income attributable to participating securities	0	3	1	13
Net income attributable to Class A and Class B common stockholders	$ 5,137	$ 4,704	$ 15,229	$ 11,652
Earnings per share attributable to Class A and Class B common stockholders:
Basic (in dollars per share)	$ 1.78	$ 1.62	$ 5.26	$ 4.02
Diluted (in dollars per share)	$ 1.76	$ 1.59	$ 5.20	$ 3.95
Weighted average shares used to compute earnings per share attributable to Class A and Class B common stockholders:
Basic (in shares)	2,885	2,904	2,895	2,898
Diluted (in shares)	2,913	2,956	2,931	2,954
Share-based compensation expense included in costs and expenses:
Share-based compensation expense	$ 1,040	$ 1,010	$ 3,180	$ 2,909
Cost of revenue
Share-based compensation expense included in costs and expenses:
Share-based compensation expense	72	47	202	128
Research and development
Share-based compensation expense included in costs and expenses:
Share-based compensation expense	748	776	2,347	2,233
Marketing and sales
Share-based compensation expense included in costs and expenses:
Share-based compensation expense	133	114	380	330
General and administrative
Share-based compensation expense included in costs and expenses:
Share-based compensation expense	$ 87	$ 73	$ 251	$ 218

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 5,137	$ 4,707	$ 15,230	$ 11,665
Other comprehensive income (loss):
Change in foreign currency translation adjustment, net of tax	(44)	174	(321)	480
Change in unrealized gain/loss on available-for-sale investments and other, net of tax	(46)	(4)	(229)	23
Comprehensive income	$ 5,047	$ 4,877	$ 14,680	$ 12,168

- Definition

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

+ References + Details

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Statement - USD ($) shares in Millions, $ in Millions	Total	Class A and Class B Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings
Impact of the adoption of new accounting pronouncement	$ 0
Balance at beginning of period (in shares) at Dec. 31, 2016		2,892
Balances at beginning of period at Dec. 31, 2016	59,194	$ 0	$ 38,227	$ (703)	$ 21,670
Issuance of common stock (in shares)		38
Issuance of common stock	335		335
Shares withheld related to net share settlement (in shares)		(17)
Shares withheld related to net share settlement	(2,360)		(1,272)		(1,088)
Share-based compensation, related to employee share-based awards	2,909		2,909
Share repurchases (in shares)		(7)
Share repurchases	(1,038)				(1,038)
Other comprehensive (loss) income	503			503
Net income	11,665				11,665
Balance at end of period (in shares) at Sep. 30, 2017		2,906
Balances at end of period at Sep. 30, 2017	71,208	$ 0	40,199	(200)	31,209
Impact of the adoption of new accounting pronouncement	0
Balance at beginning of period (in shares) at Jun. 30, 2017		2,903
Balances at beginning of period at Jun. 30, 2017	66,481	$ 0	39,291	(370)	27,560
Issuance of common stock (in shares)		13
Issuance of common stock	323		323
Shares withheld related to net share settlement (in shares)		(6)
Shares withheld related to net share settlement	(853)		(425)		(428)
Share-based compensation, related to employee share-based awards	1,010		1,010
Share repurchases (in shares)		(4)
Share repurchases	(630)				(630)
Other comprehensive (loss) income	170			170
Net income	4,707				4,707
Balance at end of period (in shares) at Sep. 30, 2017		2,906
Balances at end of period at Sep. 30, 2017	71,208	$ 0	40,199	(200)	31,209
Impact of the adoption of new accounting pronouncement	141			(31)	172
Balance at beginning of period (in shares) at Dec. 31, 2017		2,906
Balances at beginning of period at Dec. 31, 2017	74,347	$ 0	40,584	(227)	33,990
Issuance of common stock (in shares)		37
Issuance of common stock	11		11
Shares withheld related to net share settlement (in shares)		(15)
Shares withheld related to net share settlement	(2,663)		(1,423)		(1,240)
Share-based compensation, related to employee share-based awards	3,180		3,180
Share repurchases (in shares)		(54)
Share repurchases	(9,385)				(9,385)
Other comprehensive (loss) income	(519)			(519)
Net income	15,230				15,230
Balance at end of period (in shares) at Sep. 30, 2018		2,874
Balances at end of period at Sep. 30, 2018	80,342	$ 0	42,352	(777)	38,767
Impact of the adoption of new accounting pronouncement				(31)	31
Balance at beginning of period (in shares) at Jun. 30, 2018		2,891
Balances at beginning of period at Jun. 30, 2018	79,382	$ 0	41,832	(687)	38,237
Issuance of common stock (in shares)		12
Issuance of common stock	3		3
Shares withheld related to net share settlement (in shares)		(5)
Shares withheld related to net share settlement	(905)		(523)		(382)
Share-based compensation, related to employee share-based awards	1,040		1,040
Share repurchases (in shares)		(24)
Share repurchases	(4,256)				(4,256)
Other comprehensive (loss) income	(59)			(59)
Net income	5,137				5,137
Balance at end of period (in shares) at Sep. 30, 2018		2,874
Balances at end of period at Sep. 30, 2018	$ 80,342	$ 0	$ 42,352	$ (777)	$ 38,767

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net income	$ 15,230	$ 11,665
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,090	2,172
Share-based compensation	3,180	2,909
Deferred income taxes	83	(152)
Other	19	18
Changes in assets and liabilities:
Accounts receivable	(328)	(235)
Prepaid expenses and other current assets	(889)	(634)
Other assets	(99)	130
Accounts payable	88	(7)
Partners payable	116	22
Accrued expenses and other current liabilities	1,044	95
Deferred revenue and deposits	20	12
Other liabilities	102	550
Net cash provided by operating activities	21,656	16,545
Cash flows from investing activities
Purchases of property and equipment	(9,614)	(4,470)
Purchases of marketable securities	(12,658)	(20,410)
Sales of marketable securities	11,104	7,649
Maturities of marketable securities	3,391	2,228
Acquisitions of businesses, net of cash acquired, and purchases of intangible assets	(137)	(106)
Other investing activities, net	(4)	(6)
Net cash used in investing activities	(7,918)	(15,115)
Cash flows from financing activities
Taxes paid related to net share settlement of equity awards	(2,663)	(2,360)
Repurchases of Class A common stock	(9,379)	(1,018)
Other financing activities, net	11	(14)
Net cash used in financing activities	(12,031)	(3,392)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(167)	192
Net increase (decrease) in cash, cash equivalents, and restricted cash	1,540	(1,770)
Cash, cash equivalents, and restricted cash at beginning of the period	8,204	9,109
Cash, cash equivalents, and restricted cash at end of the period	9,744	7,339
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	9,637	7,201
Total cash, cash equivalents, and restricted cash	8,204	9,109
Cash paid during the period for:
Income taxes, net	2,728	1,793
Non-cash investing and financing activities:
Net change in prepaids and liabilities related to property and equipment additions	613	540
Settlement of acquisition-related contingent consideration liability	0	102
Change in unsettled repurchases of Class A common stock	$ 6	$ 20

Summary of Significant Accounting Policies (Notes)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (GAAP) and applicable rules and regulations of the Securities and Exchange Commission regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this quarterly report on Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2017.

The condensed consolidated balance sheet as of December 31, 2017 included herein was derived from the audited financial statements as of that date, but does not include all disclosures including notes required by GAAP.

The condensed consolidated financial statements include the accounts of Facebook, Inc. and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated.

The accompanying condensed consolidated financial statements reflect all normal recurring adjustments that are necessary to present fairly the results for the interim periods presented. Interim results are not necessarily indicative of the results for the full year ending December 31, 2018.

Use of Estimates

Conformity with GAAP requires the use of estimates and judgments that affect the reported amounts in the consolidated financial statements and accompanying notes. These estimates form the basis for judgments we make about the carrying values of our assets and liabilities, which are not readily apparent from other sources. We base our estimates and judgments on historical information and on various other assumptions that we believe are reasonable under the circumstances. GAAP requires us to make estimates and judgments in several areas, including, but not limited to, those related to income taxes, loss contingencies, fair value of acquired intangible assets and goodwill, collectability of accounts receivable, fair value of financial instruments, leases, useful lives of intangible assets and property and equipment, and revenue recognition. These estimates are based on management's knowledge about current events and expectations about actions we may undertake in the future. Actual results could differ materially from those estimates.

Recently Issued Accounting Pronouncements

In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update No. 2016-02, Leases (Topic 842) (ASU 2016-02), which generally requires companies to recognize operating and financing lease liabilities and corresponding right-of-use assets on the balance sheet. This guidance will be effective for us in the first quarter of 2019 on a modified retrospective basis applied either to the earliest comparative period or at transition and early adoption is permitted. We will adopt the new standard effective January 1, 2019. We have selected and implemented a lease accounting system, and are in the process of validating the accuracy of the reports generated from the system and finalizing our accounting policy and use of optional practical expedients. While we continue to evaluate the effect of adopting this guidance on our consolidated financial statements and related disclosures, we expect all of our leases including our operating leases, as disclosed in Note 8 — Commitments and Contingencies, will be subject to the new standard. We will recognize right-of-use assets and operating lease liabilities on our consolidated balance sheets upon adoption, which will increase our total assets and liabilities.

Recently Adopted Accounting Pronouncements

In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes the revenue recognition requirements in Accounting Standards Codification (ASC) Topic 605, Revenue Recognition (Topic 605). We adopted Topic 606 as of January 1, 2018 using the modified retrospective transition method applied to those contracts which were not completed as of January 1, 2018. See Revenue Recognition below for further details.

In October 2016, the FASB issued Accounting Standards Update No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers Other than Inventory (ASU 2016-16), which requires companies to recognize the income-tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs, rather than when the asset has been sold to an outside party. We adopted the new standard effective January 1, 2018, using the modified retrospective transition approach through a cumulative-effect adjustment to retained earnings as of the effective date, which was not material to our condensed consolidated financial statements.

In November 2016, the FASB issued Accounting Standards Update No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (ASU 2016-18), which requires companies to include amounts generally described as restricted cash and restricted cash equivalents in cash and cash equivalents when reconciling beginning-of-period and end-of-period total amounts shown on the statements of cash flows. We adopted the new standard effective January 1, 2018, using the retrospective transition approach. The reclassified restricted cash balances from investing activities to changes in cash, cash equivalents and restricted cash on the condensed consolidated statements of cash flows were not material for all periods presented.

In January 2017, the FASB issued Accounting Standards Update No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business (ASU 2017-01), which revises the definition of a business and provides new guidance in evaluating when a set of transferred assets and activities is a business. We adopted the new standard effective January 1, 2018 on a prospective basis. The new standard did not have a material impact on our condensed consolidated financial statements.

In February 2018, the FASB issued Accounting Standards Update No. 2018-02, Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (ASU 2018-02), which allows companies to reclassify stranded tax effects resulting from the 2017 Tax Cuts and Jobs Act (Tax Act), from accumulated other comprehensive income to retained earnings. The new standard is effective for us beginning January 1, 2019, with early adoption permitted. We elected to early adopt the new standard at the beginning of the third quarter of 2018 using the aggregate portfolio approach. The amount of stranded tax effects that were reclassified from accumulated other comprehensive income to retained earnings was not material.

Revenue Recognition

On January 1, 2018, we adopted Topic 606, using the modified retrospective transition 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 Topic 606, while prior period amounts have not been adjusted and continue to be reported in accordance with our historic accounting under Topic 605. The impact of adopting the new revenue standard was not material to our condensed consolidated financial statements and there was no adjustment to beginning retained earnings on January 1, 2018.

Under Topic 606, revenue is recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services.

We determine revenue recognition through the following steps:


•	identification of the contract, or contracts, with a customer;


•	identification of the performance obligations in the contract;


•	determination of the transaction price;


•	allocation of the transaction price to the performance obligations in the contract; and


•	recognition of revenue when, or as, we satisfy a performance obligation.

Revenue excludes sales and usage-based taxes where it has been determined that we are acting as a pass-through agent.

Revenue disaggregated by revenue source for the three and nine months ended September 30, 2018 and 2017, consists of the following (in millions):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017⁽¹⁾		2018		2017⁽¹⁾
Advertising	$	13,539	$	10,142	$	38,373	$	27,163
Payments and other fees	188		186		551		518
Total revenue	$	13,727	$	10,328	$	38,924	$	27,681

^{(1) As noted above, prior period amounts have not been adjusted under the modified retrospective method.}

Revenue disaggregated by geography, based on the billing address of our customer, consists of the following (in millions):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017⁽¹⁾		2018		2017⁽¹⁾
Revenue:
US & Canada⁽²⁾	$	6,325	$	4,823	$	17,750	$	12,972
Europe⁽³⁾	3,234		2,546		9,568		6,846
Asia-Pacific	3,007		2,042		8,253		5,424
Rest of World⁽³⁾	1,161		917		3,353		2,439
Total revenue	$	13,727	$	10,328	$	38,924	$	27,681

^{(1) As noted above, prior period amounts have not been adjusted under the modified retrospective method.}

^{(2) United States revenue was}^{$5.93 billion}^and^{$4.48 billion}^{for the}^{three months ended}^{September 30, 2018}^and²⁰¹⁷^{, respectively, and}^{$16.62 billion}^and^{$12.06 billion}^{for the}^nine^{months ended}^{September 30, 2018}^and²⁰¹⁷^{, respectively.}

^{(3) Europe includes Russia and Turkey, and Rest of World includes Africa, Latin America, and the Middle East.}

Advertising

Advertising revenue is generated by displaying ad products on Facebook, Instagram, Messenger, and third-party affiliated websites or mobile applications. Marketers pay for ad products either directly or through their relationships with advertising agencies and resellers, based on the number of impressions delivered or the number of actions, such as clicks, taken by our users.

Revenue is recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. We recognize revenue from the display of impression-based ads in the contracted period in which the impressions are delivered. Impressions are considered delivered when an ad is displayed to users. We recognize revenue from the delivery of action-based ads in the period in which a user takes the action the marketer contracted for. For advertising revenue arrangements where we are not the principal, we recognize revenue on a net basis.

We may accept a lower consideration than the amount promised per the contract for certain revenue transactions and certain customers may receive cash-based incentives or credits, which are accounted for as variable consideration when estimating the amount of revenue to recognize. We believe that there will not be significant changes to our estimates of variable consideration.

Payments and Other Fees

Payments revenue is comprised of the net fee we receive from developers using our Payments infrastructure.

Other fees revenue, which was not material for all periods presented in our financial statements, consists primarily of revenue from the delivery of virtual reality platform devices, as well as revenue from various other sources.

Deferred Revenue and Deposits

Deferred revenue consists of billings and payments from marketers in advance of revenue recognition. Deposits relate to unused balances held on behalf of our users who primarily use these balances to make purchases in games on our platform. Once this balance is utilized by a user, approximately 70% of this amount would then be payable to the developer and the balance would be recognized as revenue. The increase in the deferred revenue balance for the nine months ended September 30, 2018 was driven by prepayments from marketers, partially offset by revenue recognized that was included in the deferred revenue balance at the beginning of the period.

Our payment terms vary by the products or services offered. The term between billings and when payment is due is not significant. For certain products or services and customer types, we require payment before the products or services are delivered to the customer.

Deferred revenue and deposits consists of the following (in millions):



	September 30, 2018		December 31, 2017
Deferred revenue	$	85	$	68
Deposits	30		30
Total deferred revenue and deposits	$	115	$	98

Practical Expedients and Exemptions

We generally expense sales commissions when incurred because the amortization period would have been one year or less. These costs are recorded within sales and marketing expenses.

We do not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed.

Earnings per Share (Notes)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Earnings per Share

We compute earnings per share (EPS) of Class A and Class B common stock using the two-class method required for participating securities. We consider restricted stock awards to be participating securities because holders of such shares have non-forfeitable dividend rights in the event of our declaration of a dividend for common shares.

Undistributed earnings allocated to participating securities are subtracted from net income in determining net income attributable to common stockholders. Basic EPS is computed by dividing net income attributable to common stockholders by the weighted-average number of shares of our Class A and Class B common stock outstanding, adjusted for outstanding shares that are subject to repurchase.

For the calculation of diluted EPS, net income attributable to common stockholders for basic EPS is adjusted by the effect of dilutive securities, such as awards under our equity compensation plans and inducement awards under separate non-plan restricted stock unit (RSU) award agreements. In addition, the computation of the diluted EPS of Class A common stock assumes the conversion of our Class B common stock to Class A common stock, while the diluted EPS of Class B common stock does not assume the conversion of those shares to Class A common stock. Diluted EPS attributable to common stockholders is computed by dividing the resulting net income attributable to common stockholders by the weighted-average number of fully diluted common shares outstanding.

RSUs with anti-dilutive effect were excluded from the EPS calculation and they were not material for the three and nine months ended September 30, 2018 and 2017, respectively.

Basic and diluted EPS are the same for each class of common stock because they are entitled to the same liquidation and dividend rights.

The numerators and denominators of the basic and diluted EPS computations for our common stock are calculated as follows (in millions, except per share amounts):



	Three Months Ended September 30,										Nine Months Ended September 30,
	2018					2017					2018					2017
	Class A		Class B			Class A		Class B			Class A		Class B			Class A		Class B
Basic EPS:
Numerator
Net income	$	4,293	$	844		$	3,853	$	854		$	12,661	$	2,569		$	9,523	$	2,142
Less: Net income attributable to participating securities	—		—			3		—			1		—			11		2
Net income attributable to common stockholders	$	4,293	$	844		$	3,850	$	854		$	12,660	$	2,569		$	9,512	$	2,140
Denominator
Weighted average shares outstanding	2,411		474			2,378		528			2,407		488			2,368		533
Less: Shares subject to repurchase	—		—			1		1			—		—			2		1
Number of shares used for basic EPS computation	2,411		474			2,377		527			2,407		488			2,366		532
Basic EPS	$	1.78	$	1.78		$	1.62	$	1.62		$	5.26	$	5.26		$	4.02	$	4.02
Diluted EPS:
Numerator
Net income attributable to common stockholders	$	4,293	$	844		$	3,850	$	854		$	12,660	$	2,569		$	9,512	$	2,140
Reallocation of net income attributable to participating securities	—		—			3		—			1		—			13		—
Reallocation of net income as a result of conversion of Class B to Class A common stock	844		—			854		—			2,569		—			2,140		—
Reallocation of net income to Class B common stock	—		(4		)	—		(5		)	—		(14		)	—		(6		)
Net income attributable to common stockholders for diluted EPS	$	5,137	$	840		$	4,707	$	849		$	15,230	$	2,555		$	11,665	$	2,134
Denominator
Number of shares used for basic EPS computation	2,411		474			2,377		527			2,407		488			2,366		532
Conversion of Class B to Class A common stock	474		—			527		—			488		—			532		—
Weighted average effect of dilutive securities:
Employee stock options	2		2			3		3			2		2			4		4
RSUs	26		—			47		2			34		1			49		3
Shares subject to repurchase and other	—		—			2		1			—		—			3		1
Number of shares used for diluted EPS computation	2,913		476			2,956		533			2,931		491			2,954		540
Diluted EPS	$	1.76	$	1.76		$	1.59	$	1.59		$	5.20	$	5.20		$	3.95	$	3.95

Cash and Cash Equivalents, and Marketable Securities (Notes)

9 Months Ended

Sep. 30, 2018

Cash and Cash Equivalents, and Marketable Securities [Abstract]

Cash and Cash Equivalents, and Marketable Securities

The following table sets forth the cash and cash equivalents, and marketable securities (in millions):



	September 30, 2018		December 31, 2017
Cash and cash equivalents:
Cash	$	2,764	$	2,212
Money market funds	5,991		5,268
U.S. government securities	286		66
U.S. government agency securities	12		25
Certificate of deposits and time deposits	584		440
Corporate debt securities	—		68
Total cash and cash equivalents	9,637		8,079
Marketable securities:
U.S. government securities	14,251		12,766
U.S. government agency securities	8,356		10,944
Corporate debt securities	8,962		9,922
Total marketable securities	31,569		33,632
Total cash and cash equivalents, and marketable securities	$	41,206	$	41,711

The gross unrealized losses on our marketable securities were $514 million and $289 million as of September 30, 2018 and December 31, 2017, respectively. The gross unrealized gains for both periods were not significant. In addition, gross unrealized losses that had been in a continuous loss position for 12 months or longer were $349 million and $169 million as of September 30, 2018 and December 31, 2017, respectively. As of September 30, 2018, we considered the decreases in market value on our marketable securities to be temporary in nature and did not consider any of our investments to be other-than-temporarily impaired.

The following table classifies our marketable securities by contractual maturities (in millions):



	September 30, 2018
Due in one year	$	8,433
Due in one to five years	23,136
Total	$	31,569

Fair Value Measurement (Notes)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurement

The following table summarizes our assets measured at fair value and the classification by level of input within the fair value hierarchy (in millions):



			Fair Value Measurement at Reporting Date Using
Description	September 30, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents:
Money market funds	$	5,991	$	5,991	$	—	$	—
U.S. government securities	286		286		—		—
U.S. government agency securities	12		12		—		—
Certificate of deposits and time deposits	584		—		584		—
Marketable securities:
U.S. government securities	14,251		14,251		—		—
U.S. government agency securities	8,356		8,356		—		—
Corporate debt securities	8,962		—		8,962		—
Total cash equivalents and marketable securities	$	38,442	$	28,896	$	9,546	$	—



			Fair Value Measurement at Reporting Date Using
Description	December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents:
Money market funds	$	5,268	$	5,268	$	—	$	—
U.S. government securities	66		66		—		—
U.S. government agency securities	25		25		—		—
Certificate of deposits and time deposits	440		—		440		—
Corporate debt securities	68		—		68		—
Marketable securities:
U.S. government securities	12,766		12,766		—		—
U.S. government agency securities	10,944		10,944		—		—
Corporate debt securities	9,922		—		9,922		—
Total cash equivalents and marketable securities	$	39,499	$	29,069	$	10,430	$	—

We classify our cash equivalents and marketable securities within Level 1 or Level 2 because we use quoted market prices or alternative pricing sources and models utilizing market observable inputs to determine their fair value.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Property and Equipment (Notes)

9 Months Ended

Sep. 30, 2018

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and equipment consists of the following (in millions):



	September 30, 2018			December 31, 2017
Land	$	890		$	798
Buildings	6,609			4,909
Leasehold improvements	1,576			959
Network equipment	11,181			7,998
Computer software, office equipment and other	1,025			681
Construction in progress	5,915			2,992
Total	27,196			18,337
Less: Accumulated depreciation	(6,084		)	(4,616		)
Property and equipment, net	$	21,112		$	13,721

Construction in progress includes costs related to construction of data centers, network equipment infrastructure to support our data centers around the world, and office buildings. No interest was capitalized during the three and nine months ended September 30, 2018 and 2017.

Goodwill and Intangible Assets (Notes)

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

During the nine months ended September 30, 2018, we purchased certain intangible assets and completed business acquisitions that were not material to our condensed consolidated financial statements, either individually or in the aggregate. Accordingly, pro forma historical results of operations related to these business acquisitions during the nine months ended September 30, 2018 have not been presented. We have included the financial results of these business acquisitions in our condensed consolidated financial statements from their respective dates of acquisition.

The changes in the carrying amount of goodwill for the nine months ended September 30, 2018 are as follows (in millions):



Balance as of December 31, 2017	$	18,221
Goodwill acquired	88
Effect of currency translation adjustment	(5		)
Balance as of September 30, 2018	$	18,304

Intangible assets consist of the following (in millions):



		September 30, 2018							December 31, 2017
	Weighted-Average Remaining Useful Lives (in years)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Acquired users	3.0	$	2,056	$	(1,188	)	$	868	$	2,056	$	(971	)	$	1,085
Acquired technology	1.4	1,002		(834		)	168		972		(711		)	261
Acquired patents	5.8	805		(548		)	257		785		(499		)	286
Trade names	1.6	629		(489		)	140		629		(406		)	223
Other	2.3	162		(144		)	18		162		(133		)	29
Total intangible assets	3.2	$	4,654	$	(3,203	)	$	1,451	$	4,604	$	(2,720	)	$	1,884

Amortization expense of intangible assets was $156 million and $483 million for the three and nine months ended September 30, 2018, respectively, and $173 million and $522 million for the three and nine months ended September 30, 2017, respectively.

As of September 30, 2018, expected amortization expense for the unamortized acquired intangible assets for the next five years and thereafter is as follows (in millions):



The remainder of 2018	$	156
2019	551
2020	377
2021	271
2022	31
Thereafter	65
Total	$	1,451

Long-term Debt (Notes)	9 Months Ended
Long-term Debt (Notes)	Sep. 30, 2018
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt In May 2016, we entered into a $2.0 billion senior unsecured revolving credit facility, and any amounts outstanding under this facility will be due and payable on May 20, 2021. As of September 30, 2018, no amounts had been drawn down, and we were in compliance with the covenants under this facility.

Commitments and Contingencies (Notes)

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments

Leases

During the nine months ended September 30, 2018, we entered into additional non-cancelable operating lease agreements. Our various non-cancelable operating lease agreements, which include among others, certain of our offices, data center, land and colocation leases, have original lease periods expiring between 2018 and 2093. Operating lease expense was $170 million and $436 million for the three and nine months ended September 30, 2018, respectively, and $91 million and $247 million for the three and nine months ended September 30, 2017, respectively.

The following is a schedule, by years, of the future minimum lease payments required under non-cancelable operating leases as of September 30, 2018 (in millions):



	Operating Leases		Financing obligation, building in progress - leased facilities⁽¹⁾
The remainder of 2018	$	108	$	—
2019	726		1
2020	873		9
2021	946		9
2022	906		9
Thereafter	8,830		91
Total minimum lease payments	$	12,389	$	119

(1)

We entered into an agreement to lease an office building that is under construction. As a result of our involvement during this construction period, we are considered for accounting purposes to be the owner of the construction project. Financing obligation, building in progress - leased facilities represent the total expected financing and lease obligations associated with this lease and will be settled through monthly lease payments to the landlord when we occupy the office space upon completion. This amount includes $70 million that is included in property and equipment, net and other liabilities on our condensed consolidated balance sheets as of September 30, 2018.

Other contractual commitments

We also have $5.29 billion of non-cancelable contractual commitments as of September 30, 2018, primarily related to network infrastructure and our data center operations. The majority of these commitments are due within five years.

Contingencies

Beginning on March 20, 2018, multiple putative class actions and derivative actions were filed in state and federal courts in the United States and elsewhere against us and certain of our directors and officers alleging violations of securities laws, breach of fiduciary duties, and other causes of action in connection with our user data practices and the misuse of certain data by a developer that shared such data with third parties in violation of our terms and policies, and seeking unspecified damages and injunctive relief. Beginning on July 27, 2018, two putative class actions were filed in federal court in the United States against us and certain of our directors and officers alleging violations of securities laws in connection with the disclosure of our earnings results for the second quarter of 2018, and seeking unspecified damages. These two actions subsequently were transferred and consolidated in the U.S. District Court for the Northern District of California with the putative securities class action described above relating to the misuse of certain data by a developer. We believe these lawsuits are without merit, and we are vigorously defending them. In addition, our user data practices and the events surrounding the misuse of certain data by a developer became the subject of U.S. Federal Trade Commission and other government inquiries in the United States, Europe, and other jurisdictions.

Beginning on September 28, 2018, multiple putative class actions were filed in state and federal courts in the United States and elsewhere against us alleging violations of consumer protection laws and other causes of action in connection with a third-party cyber-attack that exploited a vulnerability in Facebook’s code to steal user access tokens and access certain profile information from user accounts on Facebook, and seeking unspecified damages and injunctive relief. We believe these lawsuits are without merit, and we are vigorously defending them. In addition, the events surrounding this cyber-attack became the subject of Irish Data Protection Commission, U.S. Federal Trade Commission and other government inquiries in the United States, Europe, and other jurisdictions.

In addition, from time to time, we are subject to litigation and other proceedings involving law enforcement and other regulatory agencies, including in particular in Brazil and Europe, in order to ascertain the precise scope of our legal obligations to comply with the requests of those agencies, including our obligation to disclose user information in particular circumstances. A number of such instances have resulted in the assessment of fines and penalties against us. We believe we have multiple legal grounds to satisfy these requests or prevail against associated fines and penalties, and we intend to vigorously defend such fines and penalties.

Although we believe that it is reasonably possible that we may incur a substantial loss in some of the cases, actions or inquiries described above, we are currently unable to estimate the amount of such losses or a range of possible losses.

We are also party to various other legal proceedings, claims, and regulatory, tax or government inquiries and investigations that arise in the ordinary course of business. With respect to these matters, we evaluate the developments on a regular basis and accrue a liability when we believe a loss is probable and the amount can be reasonably estimated. We believe that the amount or any estimable range of reasonably possible or probable loss will not, either individually or in the aggregate, have a material adverse effect on our business and consolidated financial statements. However, the outcome of these matters is inherently uncertain. Therefore, if one or more of these matters were resolved against us for amounts in excess of management's expectations, our results of operations and financial condition, including in a particular reporting period in which any such outcome becomes probable and estimable, could be materially adversely affected.

For information regarding income tax contingencies, see Note 10 — Income Taxes.

Stockholders' Equity (Notes)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Stockholders' Equity

Share Repurchase Program

In November 2016, our board of directors authorized a $6.0 billion share repurchase program of our Class A common stock, which commenced in 2017 and does not have an expiration date. We completed repurchases under this authorization during the second quarter of 2018. In April 2018, the authorization of the repurchase of our Class A common stock was increased by an additional $9.0 billion. During the nine months ended September 30, 2018, we repurchased and subsequently retired approximately 54 million shares of our Class A common stock for an aggregate amount of approximately $9.39 billion. As of September 30, 2018, approximately $3.54 billion remained available and authorized for repurchases. The timing and actual number of shares repurchased under this program depend on a variety of factors, including price, general business and market conditions, and other investment opportunities, and shares may be repurchased through open market purchases or privately negotiated transactions, including through the use of trading plans intended to qualify under Rule 10b5-1 under the Securities Exchange Act of 1934, as amended.

Share-based Compensation Plans

We maintain two share-based employee compensation plans: the 2012 Equity Incentive Plan, which was amended in each of June 2016 and February 2018 (Amended 2012 Plan), and the 2005 Stock Plan (collectively, Stock Plans). Our Amended 2012 Plan serves as the successor to our 2005 Stock Plan and provides for the issuance of incentive and nonstatutory stock options, restricted stock awards, stock appreciation rights, RSUs, performance shares, and stock bonuses to qualified employees, directors and consultants. Outstanding awards under the 2005 Stock Plan continue to be subject to the terms and conditions of the 2005 Stock Plan.

Effective January 1, 2018, there were 67 million shares of our Class A common stock reserved for issuance under our Amended 2012 Plan. The number of shares reserved for issuance under our Amended 2012 Plan increases automatically on January 1 of each of the calendar years during the term of the Amended 2012 Plan, which will continue through and including April 2026 unless terminated earlier by our board of directors or a committee thereof, by a number of shares of Class A common stock equal to the lesser of (i) 2.5% of the total issued and outstanding shares of our Class A common stock as of the immediately preceding December 31st or (ii) a number of shares determined by our board of directors.

The following table summarizes the activities of stock option awards under the Stock Plans for the nine months ended September 30, 2018:



	Shares Subject to Options Outstanding
	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value⁽¹⁾
	(in thousands)				(in years)	(in millions)
Balance as of December 31, 2017	3,078		$	10.06
Stock options exercised	(1,398	)	$	8.06
Balance as of September 30, 2018	1,680		$	11.72	1.8	$	257
Stock options exercisable as of September 30, 2018	1,680		$	11.72	1.8	$	257


(1)	The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying stock option awards and the official closing price of our Class A common stock of $164.46 as reported on the Nasdaq Global Select Market on September 30, 2018.

The following table summarizes the activities for our unvested RSUs for the nine months ended September 30, 2018:



	Unvested RSUs⁽¹⁾
	Number of Shares		Weighted Average Grant Date Fair Value
	(in thousands)
Unvested at December 31, 2017	81,214		$	110.49
Granted	33,015		$	172.97
Vested	(34,176	)	$	101.64
Forfeited	(5,938	)	$	114.33
Unvested at September 30, 2018	74,115		$	142.08


(1)	Unvested shares at December 31, 2017 included an inducement award issued in connection with the WhatsApp acquisition in 2014 which was subject to the terms, restrictions, and conditions of a separate non-plan RSU award agreement.

The fair value as of the respective vesting dates of RSUs that vested during the three and nine months ended September 30, 2018 was $2.11 billion and $6.24 billion, respectively, and $1.73 billion and $4.94 billion during the three and nine months ended September 30, 2017, respectively.

As of September 30, 2018, there was $9.57 billion of unrecognized share-based compensation expense related to RSUs. This unrecognized compensation expense is expected to be recognized over a weighted-average period of approximately three years based on vesting under the award service conditions.

Income Taxes (Notes)	9 Months Ended
Income Taxes (Notes)	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our tax provision for interim periods is determined using an estimated annual effective tax rate, adjusted for discrete items arising in that quarter. In each quarter, we update the estimated annual effective tax rate and make a year-to-date adjustment to the provision. The estimated annual effective tax rate is subject to significant volatility due to several factors, including our ability to accurately predict the proportion of our income (loss) before provision for income taxes in multiple jurisdictions, the effects of acquisitions, and the integration of those acquisitions. Our 2018 effective tax rate differs from the U.S. statutory rate of 21% primarily due to a portion of our income before provision for income taxes being earned in jurisdictions subject to tax rates lower than 21%, and the recognition of excess tax benefits from share-based compensation. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (SAB 118), which allows us to record provisional amounts for the Tax Act during a measurement period not to extend beyond one year of the enactment date. We continue to analyze our provisional amounts, which are still subject to change during the measurement period. We anticipate further guidance on accounting interpretations from the FASB and application of the law from the U.S. Department of the Treasury. During the three and nine months ended September 30, 2018, we completed certain items for our remeasurement of deferred tax balances and recorded immaterial adjustments. Our gross unrecognized tax benefits were $4.26 billion and $3.87 billion on September 30, 2018 and December 31, 2017, respectively. If the gross unrecognized tax benefits as of September 30, 2018 were realized in a subsequent period, this would result in a tax benefit of $2.80 billion within our provision of income taxes at such time. The amount of interest and penalties accrued as of September 30, 2018 and December 31, 2017 was $310 million and $154 million, respectively. We expect to continue to accrue unrecognized tax benefits for certain recurring tax positions and anticipate such amount accrued for future quarters will be similar to the amounts accrued by quarter in 2017. On July 27, 2015, the United States Tax Court (Tax Court) issued an opinion in Altera Corp. v. Commissioner (Tax Court Opinion), which concluded that related parties in a cost sharing arrangement are not required to share expenses related to share-based compensation. The Tax Court Opinion was appealed by the Commissioner to the Ninth Circuit Court of Appeals (Ninth Circuit). On July 24, 2018, the Ninth Circuit issued an opinion (Ninth Circuit Opinion) that reversed the Tax Court Opinion. The Ninth Circuit Opinion was subsequently withdrawn and the case is being reheard. Since the Ninth Circuit Opinion was withdrawn, we continue to treat our share-based compensation expense in accordance with the Tax Court Opinion. We also continue to monitor developments in this case and any impact the final opinion could have on our consolidated financial statements. We are subject to taxation in the United States and various other state and foreign jurisdictions. The material jurisdictions in which we are subject to potential examination include the United States and Ireland. We are under examination by the Internal Revenue Service (IRS) for our 2014 through 2016 tax years and by the Ireland tax authorities for our 2012 through 2015 tax years. Our 2017 tax year remains open to examination by the IRS. Our 2016 and subsequent tax years remain open to examination in Ireland. In July 2016, we received a Statutory Notice of Deficiency (Notice) from the IRS related to transfer pricing with our foreign subsidiaries in conjunction with the examination of the 2010 tax year. While the Notice applies only to the 2010 tax year, the IRS states that it will also apply its position for tax years subsequent to 2010, which, if the IRS prevails in its position, could result in an additional federal tax liability of an estimated, aggregate amount of up to approximately $5.0 billion in excess of the amounts in our originally filed U.S. return, plus interest and any penalties asserted. We do not agree with the position of the IRS and have filed a petition in the Tax Court challenging the Notice. As of September 30, 2018, we have not resolved this matter, and proceedings continue in the Tax Court. In March 2018, we received a second Notice from the IRS in conjunction with the examination of our 2011 through 2013 tax years. The IRS applied its position from the 2010 tax year to each of these years and also proposed new adjustments related to other transfer pricing with our foreign subsidiaries and certain tax credits that we claimed. If the IRS prevails in its position for these new adjustments, this could result in an additional federal tax liability of up to approximately $680 million in excess of the amounts in our originally filed U.S. return, plus interest and any penalties asserted. We do not agree with the positions of the IRS in the second Notice and have filed a petition in the Tax Court challenging the second Notice. We have previously accrued an estimated unrecognized tax benefit consistent with the guidance in ASC 740 that is lower than the potential additional federal tax liability from the positions taken by the IRS in the two Notices. In addition, if the IRS prevails in its positions related to transfer pricing with our foreign subsidiaries, the additional tax that we would owe would be partially offset by a reduction in the tax that we owe under the mandatory transition tax on accumulated foreign earnings from the Tax Act. We believe that adequate amounts have been reserved in accordance with ASC 740 for any adjustments to the provision for income taxes or other tax items that may ultimately result from these examinations. The timing of the resolution, settlement, and closure of any audits is highly uncertain, and it is reasonably possible that the balance of gross unrecognized tax benefits could significantly change in the next 12 months. Given the number of years remaining that are subject to examination, we are unable to estimate the full range of possible adjustments to the balance of gross unrecognized tax benefits. If the taxing authorities prevail in the assessment of additional tax due, the assessed tax, interest, and penalties, if any, could have a material adverse impact on our financial position, results of operations, and cash flows.

Geographical Information (Notes)

9 Months Ended

Sep. 30, 2018

Segments, Geographical Areas [Abstract]

Geographical Information

The following table sets forth property and equipment, net by geographic area (in millions):



	September 30, 2018		December 31, 2017
Property and equipment, net:
United States	$	16,038	$	10,406
Rest of the world⁽¹⁾	5,074		3,315
Total property and equipment, net	$	21,112	$	13,721


(1)	No individual country, other than disclosed above, exceeded 10% of our total property and equipment, net for any period presented.

For information regarding revenue disaggregated by geography, see Note 1 — Summary of Significant Accounting Policies, Revenue Recognition.

Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (GAAP) and applicable rules and regulations of the Securities and Exchange Commission regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this quarterly report on Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2017.

The condensed consolidated balance sheet as of December 31, 2017 included herein was derived from the audited financial statements as of that date, but does not include all disclosures including notes required by GAAP.

The condensed consolidated financial statements include the accounts of Facebook, Inc. and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated.

The accompanying condensed consolidated financial statements reflect all normal recurring adjustments that are necessary to present fairly the results for the interim periods presented. Interim results are not necessarily indicative of the results for the full year ending December 31, 2018.

Use of Estimates

Conformity with GAAP requires the use of estimates and judgments that affect the reported amounts in the consolidated financial statements and accompanying notes. These estimates form the basis for judgments we make about the carrying values of our assets and liabilities, which are not readily apparent from other sources. We base our estimates and judgments on historical information and on various other assumptions that we believe are reasonable under the circumstances. GAAP requires us to make estimates and judgments in several areas, including, but not limited to, those related to income taxes, loss contingencies, fair value of acquired intangible assets and goodwill, collectability of accounts receivable, fair value of financial instruments, leases, useful lives of intangible assets and property and equipment, and revenue recognition. These estimates are based on management's knowledge about current events and expectations about actions we may undertake in the future. Actual results could differ materially from those estimates.

Recently Issued and Adopted Accounting Pronouncements

Recently Issued Accounting Pronouncements

In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update No. 2016-02, Leases (Topic 842) (ASU 2016-02), which generally requires companies to recognize operating and financing lease liabilities and corresponding right-of-use assets on the balance sheet. This guidance will be effective for us in the first quarter of 2019 on a modified retrospective basis applied either to the earliest comparative period or at transition and early adoption is permitted. We will adopt the new standard effective January 1, 2019. We have selected and implemented a lease accounting system, and are in the process of validating the accuracy of the reports generated from the system and finalizing our accounting policy and use of optional practical expedients. While we continue to evaluate the effect of adopting this guidance on our consolidated financial statements and related disclosures, we expect all of our leases including our operating leases, as disclosed in Note 8 — Commitments and Contingencies, will be subject to the new standard. We will recognize right-of-use assets and operating lease liabilities on our consolidated balance sheets upon adoption, which will increase our total assets and liabilities.

Recently Adopted Accounting Pronouncements

In May 2014, the FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes the revenue recognition requirements in Accounting Standards Codification (ASC) Topic 605, Revenue Recognition (Topic 605). We adopted Topic 606 as of January 1, 2018 using the modified retrospective transition method applied to those contracts which were not completed as of January 1, 2018. See Revenue Recognition below for further details.

In October 2016, the FASB issued Accounting Standards Update No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers Other than Inventory (ASU 2016-16), which requires companies to recognize the income-tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs, rather than when the asset has been sold to an outside party. We adopted the new standard effective January 1, 2018, using the modified retrospective transition approach through a cumulative-effect adjustment to retained earnings as of the effective date, which was not material to our condensed consolidated financial statements.

In November 2016, the FASB issued Accounting Standards Update No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (ASU 2016-18), which requires companies to include amounts generally described as restricted cash and restricted cash equivalents in cash and cash equivalents when reconciling beginning-of-period and end-of-period total amounts shown on the statements of cash flows. We adopted the new standard effective January 1, 2018, using the retrospective transition approach. The reclassified restricted cash balances from investing activities to changes in cash, cash equivalents and restricted cash on the condensed consolidated statements of cash flows were not material for all periods presented.

In January 2017, the FASB issued Accounting Standards Update No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business (ASU 2017-01), which revises the definition of a business and provides new guidance in evaluating when a set of transferred assets and activities is a business. We adopted the new standard effective January 1, 2018 on a prospective basis. The new standard did not have a material impact on our condensed consolidated financial statements.

In February 2018, the FASB issued Accounting Standards Update No. 2018-02, Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (ASU 2018-02), which allows companies to reclassify stranded tax effects resulting from the 2017 Tax Cuts and Jobs Act (Tax Act), from accumulated other comprehensive income to retained earnings. The new standard is effective for us beginning January 1, 2019, with early adoption permitted. We elected to early adopt the new standard at the beginning of the third quarter of 2018 using the aggregate portfolio approach. The amount of stranded tax effects that were reclassified from accumulated other comprehensive income to retained earnings was not material.

Revenue Recognition

On January 1, 2018, we adopted Topic 606, using the modified retrospective transition 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 Topic 606, while prior period amounts have not been adjusted and continue to be reported in accordance with our historic accounting under Topic 605. The impact of adopting the new revenue standard was not material to our condensed consolidated financial statements and there was no adjustment to beginning retained earnings on January 1, 2018.

Under Topic 606, revenue is recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services.

We determine revenue recognition through the following steps:


•	identification of the contract, or contracts, with a customer;


•	identification of the performance obligations in the contract;


•	determination of the transaction price;


•	allocation of the transaction price to the performance obligations in the contract; and


•	recognition of revenue when, or as, we satisfy a performance obligation

Practical Expedients and Exemptions

We generally expense sales commissions when incurred because the amortization period would have been one year or less. These costs are recorded within sales and marketing expenses.

We do not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed.

Advertising

Advertising revenue is generated by displaying ad products on Facebook, Instagram, Messenger, and third-party affiliated websites or mobile applications. Marketers pay for ad products either directly or through their relationships with advertising agencies and resellers, based on the number of impressions delivered or the number of actions, such as clicks, taken by our users.

Revenue is recognized when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we expect to be entitled to in exchange for those goods or services. We recognize revenue from the display of impression-based ads in the contracted period in which the impressions are delivered. Impressions are considered delivered when an ad is displayed to users. We recognize revenue from the delivery of action-based ads in the period in which a user takes the action the marketer contracted for. For advertising revenue arrangements where we are not the principal, we recognize revenue on a net basis.

We may accept a lower consideration than the amount promised per the contract for certain revenue transactions and certain customers may receive cash-based incentives or credits, which are accounted for as variable consideration when estimating the amount of revenue to recognize. We believe that there will not be significant changes to our estimates of variable consideration.

Payments and Other Fees

Payments revenue is comprised of the net fee we receive from developers using our Payments infrastructure.

Other fees revenue, which was not material for all periods presented in our financial statements, consists primarily of revenue from the delivery of virtual reality platform devices, as well as revenue from various other sources.

Deferred Revenue and Deposits

Deferred revenue consists of billings and payments from marketers in advance of revenue recognition. Deposits relate to unused balances held on behalf of our users who primarily use these balances to make purchases in games on our platform. Once this balance is utilized by a user, approximately 70% of this amount would then be payable to the developer and the balance would be recognized as revenue. The increase in the deferred revenue balance for the nine months ended September 30, 2018 was driven by prepayments from marketers, partially offset by revenue recognized that was included in the deferred revenue balance at the beginning of the period.

Our payment terms vary by the products or services offered. The term between billings and when payment is due is not significant. For certain products or services and customer types, we require payment before the products or services are delivered to the customer.

Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Disaggregation of Revenue

Revenue disaggregated by revenue source for the three and nine months ended September 30, 2018 and 2017, consists of the following (in millions):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017⁽¹⁾		2018		2017⁽¹⁾
Advertising	$	13,539	$	10,142	$	38,373	$	27,163
Payments and other fees	188		186		551		518
Total revenue	$	13,727	$	10,328	$	38,924	$	27,681

^{(1) As noted above, prior period amounts have not been adjusted under the modified retrospective method.}

Revenue disaggregated by geography, based on the billing address of our customer, consists of the following (in millions):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017⁽¹⁾		2018		2017⁽¹⁾
Revenue:
US & Canada⁽²⁾	$	6,325	$	4,823	$	17,750	$	12,972
Europe⁽³⁾	3,234		2,546		9,568		6,846
Asia-Pacific	3,007		2,042		8,253		5,424
Rest of World⁽³⁾	1,161		917		3,353		2,439
Total revenue	$	13,727	$	10,328	$	38,924	$	27,681

^{(1) As noted above, prior period amounts have not been adjusted under the modified retrospective method.}

^{(2) United States revenue was}^{$5.93 billion}^and^{$4.48 billion}^{for the}^{three months ended}^{September 30, 2018}^and²⁰¹⁷^{, respectively, and}^{$16.62 billion}^and^{$12.06 billion}^{for the}^nine^{months ended}^{September 30, 2018}^and²⁰¹⁷^{, respectively.}

^{(3) Europe includes Russia and Turkey, and Rest of World includes Africa, Latin America, and the Middle East.}

Deferred Revenue and Deposits

Deferred revenue and deposits consists of the following (in millions):



	September 30, 2018		December 31, 2017
Deferred revenue	$	85	$	68
Deposits	30		30
Total deferred revenue and deposits	$	115	$	98

Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Numerators and Denominators of Basic and Diluted EPS Computations for Common Stock

The numerators and denominators of the basic and diluted EPS computations for our common stock are calculated as follows (in millions, except per share amounts):



	Three Months Ended September 30,										Nine Months Ended September 30,
	2018					2017					2018					2017
	Class A		Class B			Class A		Class B			Class A		Class B			Class A		Class B
Basic EPS:
Numerator
Net income	$	4,293	$	844		$	3,853	$	854		$	12,661	$	2,569		$	9,523	$	2,142
Less: Net income attributable to participating securities	—		—			3		—			1		—			11		2
Net income attributable to common stockholders	$	4,293	$	844		$	3,850	$	854		$	12,660	$	2,569		$	9,512	$	2,140
Denominator
Weighted average shares outstanding	2,411		474			2,378		528			2,407		488			2,368		533
Less: Shares subject to repurchase	—		—			1		1			—		—			2		1
Number of shares used for basic EPS computation	2,411		474			2,377		527			2,407		488			2,366		532
Basic EPS	$	1.78	$	1.78		$	1.62	$	1.62		$	5.26	$	5.26		$	4.02	$	4.02
Diluted EPS:
Numerator
Net income attributable to common stockholders	$	4,293	$	844		$	3,850	$	854		$	12,660	$	2,569		$	9,512	$	2,140
Reallocation of net income attributable to participating securities	—		—			3		—			1		—			13		—
Reallocation of net income as a result of conversion of Class B to Class A common stock	844		—			854		—			2,569		—			2,140		—
Reallocation of net income to Class B common stock	—		(4		)	—		(5		)	—		(14		)	—		(6		)
Net income attributable to common stockholders for diluted EPS	$	5,137	$	840		$	4,707	$	849		$	15,230	$	2,555		$	11,665	$	2,134
Denominator
Number of shares used for basic EPS computation	2,411		474			2,377		527			2,407		488			2,366		532
Conversion of Class B to Class A common stock	474		—			527		—			488		—			532		—
Weighted average effect of dilutive securities:
Employee stock options	2		2			3		3			2		2			4		4
RSUs	26		—			47		2			34		1			49		3
Shares subject to repurchase and other	—		—			2		1			—		—			3		1
Number of shares used for diluted EPS computation	2,913		476			2,956		533			2,931		491			2,954		540
Diluted EPS	$	1.76	$	1.76		$	1.59	$	1.59		$	5.20	$	5.20		$	3.95	$	3.95

Cash and Cash Equivalents, and Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2018

Cash and Cash Equivalents, and Marketable Securities [Abstract]

Cash and Cash Equivalents, and Marketable Securities

The following table sets forth the cash and cash equivalents, and marketable securities (in millions):



	September 30, 2018		December 31, 2017
Cash and cash equivalents:
Cash	$	2,764	$	2,212
Money market funds	5,991		5,268
U.S. government securities	286		66
U.S. government agency securities	12		25
Certificate of deposits and time deposits	584		440
Corporate debt securities	—		68
Total cash and cash equivalents	9,637		8,079
Marketable securities:
U.S. government securities	14,251		12,766
U.S. government agency securities	8,356		10,944
Corporate debt securities	8,962		9,922
Total marketable securities	31,569		33,632
Total cash and cash equivalents, and marketable securities	$	41,206	$	41,711

Marketable Securities by Contractual Maturities

The following table classifies our marketable securities by contractual maturities (in millions):



	September 30, 2018
Due in one year	$	8,433
Due in one to five years	23,136
Total	$	31,569

Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value

The following table summarizes our assets measured at fair value and the classification by level of input within the fair value hierarchy (in millions):



			Fair Value Measurement at Reporting Date Using
Description	September 30, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents:
Money market funds	$	5,991	$	5,991	$	—	$	—
U.S. government securities	286		286		—		—
U.S. government agency securities	12		12		—		—
Certificate of deposits and time deposits	584		—		584		—
Marketable securities:
U.S. government securities	14,251		14,251		—		—
U.S. government agency securities	8,356		8,356		—		—
Corporate debt securities	8,962		—		8,962		—
Total cash equivalents and marketable securities	$	38,442	$	28,896	$	9,546	$	—



			Fair Value Measurement at Reporting Date Using
Description	December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents:
Money market funds	$	5,268	$	5,268	$	—	$	—
U.S. government securities	66		66		—		—
U.S. government agency securities	25		25		—		—
Certificate of deposits and time deposits	440		—		440		—
Corporate debt securities	68		—		68		—
Marketable securities:
U.S. government securities	12,766		12,766		—		—
U.S. government agency securities	10,944		10,944		—		—
Corporate debt securities	9,922		—		9,922		—
Total cash equivalents and marketable securities	$	39,499	$	29,069	$	10,430	$	—

Property and Equipment (Tables)

9 Months Ended

Sep. 30, 2018

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and equipment consists of the following (in millions):



	September 30, 2018			December 31, 2017
Land	$	890		$	798
Buildings	6,609			4,909
Leasehold improvements	1,576			959
Network equipment	11,181			7,998
Computer software, office equipment and other	1,025			681
Construction in progress	5,915			2,992
Total	27,196			18,337
Less: Accumulated depreciation	(6,084		)	(4,616		)
Property and equipment, net	$	21,112		$	13,721

Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill for the nine months ended September 30, 2018 are as follows (in millions):



Balance as of December 31, 2017	$	18,221
Goodwill acquired	88
Effect of currency translation adjustment	(5		)
Balance as of September 30, 2018	$	18,304

Schedule of Intangible Assets

Intangible assets consist of the following (in millions):



		September 30, 2018							December 31, 2017
	Weighted-Average Remaining Useful Lives (in years)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Acquired users	3.0	$	2,056	$	(1,188	)	$	868	$	2,056	$	(971	)	$	1,085
Acquired technology	1.4	1,002		(834		)	168		972		(711		)	261
Acquired patents	5.8	805		(548		)	257		785		(499		)	286
Trade names	1.6	629		(489		)	140		629		(406		)	223
Other	2.3	162		(144		)	18		162		(133		)	29
Total intangible assets	3.2	$	4,654	$	(3,203	)	$	1,451	$	4,604	$	(2,720	)	$	1,884

Expected Amortization Expense for Unamortized Acquired Intangible Assets

As of September 30, 2018, expected amortization expense for the unamortized acquired intangible assets for the next five years and thereafter is as follows (in millions):



The remainder of 2018	$	156
2019	551
2020	377
2021	271
2022	31
Thereafter	65
Total	$	1,451

Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

The following is a schedule, by years, of the future minimum lease payments required under non-cancelable operating leases as of September 30, 2018 (in millions):



	Operating Leases		Financing obligation, building in progress - leased facilities⁽¹⁾
The remainder of 2018	$	108	$	—
2019	726		1
2020	873		9
2021	946		9
2022	906		9
Thereafter	8,830		91
Total minimum lease payments	$	12,389	$	119

(1)

We entered into an agreement to lease an office building that is under construction. As a result of our involvement during this construction period, we are considered for accounting purposes to be the owner of the construction project. Financing obligation, building in progress - leased facilities represent the total expected financing and lease obligations associated with this lease and will be settled through monthly lease payments to the landlord when we occupy the office space upon completion. This amount includes $70 million that is included in property and equipment, net and other liabilities on our condensed consolidated balance sheets as of September 30, 2018.

Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Stock Option Activity under Stock Plans

The following table summarizes the activities of stock option awards under the Stock Plans for the nine months ended September 30, 2018:



	Shares Subject to Options Outstanding
	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value⁽¹⁾
	(in thousands)				(in years)	(in millions)
Balance as of December 31, 2017	3,078		$	10.06
Stock options exercised	(1,398	)	$	8.06
Balance as of September 30, 2018	1,680		$	11.72	1.8	$	257
Stock options exercisable as of September 30, 2018	1,680		$	11.72	1.8	$	257


(1)	The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying stock option awards and the official closing price of our Class A common stock of $164.46 as reported on the Nasdaq Global Select Market on September 30, 2018.

Restricted Stock Units Award Activity

The following table summarizes the activities for our unvested RSUs for the nine months ended September 30, 2018:



	Unvested RSUs⁽¹⁾
	Number of Shares		Weighted Average Grant Date Fair Value
	(in thousands)
Unvested at December 31, 2017	81,214		$	110.49
Granted	33,015		$	172.97
Vested	(34,176	)	$	101.64
Forfeited	(5,938	)	$	114.33
Unvested at September 30, 2018	74,115		$	142.08


(1)	Unvested shares at December 31, 2017 included an inducement award issued in connection with the WhatsApp acquisition in 2014 which was subject to the terms, restrictions, and conditions of a separate non-plan RSU award agreement

Geographical Information (Tables)

9 Months Ended

Sep. 30, 2018

Segments, Geographical Areas [Abstract]

Revenue and Property and Equipment by Geographic Area

The following table sets forth property and equipment, net by geographic area (in millions):



	September 30, 2018		December 31, 2017
Property and equipment, net:
United States	$	16,038	$	10,406
Rest of the world⁽¹⁾	5,074		3,315
Total property and equipment, net	$	21,112	$	13,721


(1)	No individual country, other than disclosed above, exceeded 10% of our total property and equipment, net for any period presented.

Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 13,727	$ 10,328	$ 38,924	$ 27,681
US & Canada
Disaggregation of Revenue [Line Items]
Revenues	6,325	4,823	17,750	12,972
Europe
Disaggregation of Revenue [Line Items]
Revenues	3,234	2,546	9,568	6,846
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenues	3,007	2,042	8,253	5,424
Rest of the world
Disaggregation of Revenue [Line Items]
Revenues	1,161	917	3,353	2,439
United States
Disaggregation of Revenue [Line Items]
Revenues	5,930	4,480	16,620	12,060
Advertising
Disaggregation of Revenue [Line Items]
Revenues	13,539	10,142	38,373	27,163
Payments and other fees
Disaggregation of Revenue [Line Items]
Revenues	$ 188	$ 186	$ 551	$ 518

Summary of Significant Accounting Policies - Deferred Revenue and Deposits (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Deferred revenue	$ 85	$ 68
Deposits	30	30
Total deferred revenue and deposits	$ 115	$ 98

Summary of Significant Accounting Policies - Narrative (Details)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Percentage payable to developer	70.00%

Earnings per Share - Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator
Net income	$ 5,137	$ 4,707	$ 15,230	$ 11,665
Less: Net income attributable to participating securities	0	3	1	13
Net income attributable to Class A and Class B common stockholders	$ 5,137	$ 4,704	$ 15,229	$ 11,652
Denominator
Number of shares used for basic EPS computation (in shares)	2,885	2,904	2,895	2,898
Basic EPS (in dollars per share)	$ 1.78	$ 1.62	$ 5.26	$ 4.02
Numerator
Net income attributable to common stockholders	$ 5,137	$ 4,704	$ 15,229	$ 11,652
Denominator
Number of shares used for basic EPS computation (in shares)	2,885	2,904	2,895	2,898
Weighted average effect of dilutive securities:
Number of shares used for diluted EPS computation (in shares)	2,913	2,956	2,931	2,954
Diluted EPS (in dollars per share)	$ 1.76	$ 1.59	$ 5.20	$ 3.95
Class A Common Stock
Numerator
Net income	$ 4,293	$ 3,853	$ 12,661	$ 9,523
Less: Net income attributable to participating securities	0	3	1	11
Net income attributable to Class A and Class B common stockholders	$ 4,293	$ 3,850	$ 12,660	$ 9,512
Denominator
Weighted average shares outstanding (in shares)	2,411	2,378	2,407	2,368
Less: Shares subject to repurchase (in shares)	0	1	0	2
Number of shares used for basic EPS computation (in shares)	2,411	2,377	2,407	2,366
Basic EPS (in dollars per share)	$ 1.78	$ 1.62	$ 5.26	$ 4.02
Numerator
Net income attributable to common stockholders	$ 4,293	$ 3,850	$ 12,660	$ 9,512
Reallocation of net income attributable to participating securities	0	3	1	13
Reallocation of net income as a result of conversion of Class B to Class A common stock	844	854	2,569	2,140
Reallocation of net income to Class B common stock	0	0	0	0
Net income attributable to common stockholders for diluted EPS	$ 5,137	$ 4,707	$ 15,230	$ 11,665
Denominator
Number of shares used for basic EPS computation (in shares)	2,411	2,377	2,407	2,366
Conversion of Class B to Class A common stock (in shares)	474	527	488	532
Weighted average effect of dilutive securities:
Shares subject to repurchase (in shares)	0	2	0	3
Number of shares used for diluted EPS computation (in shares)	2,913	2,956	2,931	2,954
Diluted EPS (in dollars per share)	$ 1.76	$ 1.59	$ 5.20	$ 3.95
Class A Common Stock \| Employee Stock Options
Weighted average effect of dilutive securities:
Share based payment arrangements (in shares)	2	3	2	4
Class A Common Stock \| Restricted Stock Units (RSUs)
Weighted average effect of dilutive securities:
Share based payment arrangements (in shares)	26	47	34	49
Class B Common Stock
Numerator
Net income	$ 844	$ 854	$ 2,569	$ 2,142
Less: Net income attributable to participating securities	0	0	0	2
Net income attributable to Class A and Class B common stockholders	$ 844	$ 854	$ 2,569	$ 2,140
Denominator
Weighted average shares outstanding (in shares)	474	528	488	533
Less: Shares subject to repurchase (in shares)	0	1	0	1
Number of shares used for basic EPS computation (in shares)	474	527	488	532
Basic EPS (in dollars per share)	$ 1.78	$ 1.62	$ 5.26	$ 4.02
Numerator
Net income attributable to common stockholders	$ 844	$ 854	$ 2,569	$ 2,140
Reallocation of net income attributable to participating securities	0	0	0	0
Reallocation of net income as a result of conversion of Class B to Class A common stock	0	0	0	0
Reallocation of net income to Class B common stock	(4)	(5)	(14)	(6)
Net income attributable to common stockholders for diluted EPS	$ 840	$ 849	$ 2,555	$ 2,134
Denominator
Number of shares used for basic EPS computation (in shares)	474	527	488	532
Conversion of Class B to Class A common stock (in shares)	0	0	0	0
Weighted average effect of dilutive securities:
Shares subject to repurchase (in shares)	0	1	0	1
Number of shares used for diluted EPS computation (in shares)	476	533	491	540
Diluted EPS (in dollars per share)	$ 1.76	$ 1.59	$ 5.20	$ 3.95
Class B Common Stock \| Employee Stock Options
Weighted average effect of dilutive securities:
Share based payment arrangements (in shares)	2	3	2	4
Class B Common Stock \| Restricted Stock Units (RSUs)
Weighted average effect of dilutive securities:
Share based payment arrangements (in shares)	0	2	1	3

Cash and Cash Equivalents, and Marketable Securities - Breakout of Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Cash and Cash Equivalents, and Marketable Securities
Cash and cash equivalents	$ 9,637	$ 8,079	$ 7,201
Marketable securities	31,569	33,632
Total cash and cash equivalents, and marketable securities	41,206	41,711
U.S. government securities
Cash and Cash Equivalents, and Marketable Securities
Marketable securities	14,251	12,766
U.S. government agency securities
Cash and Cash Equivalents, and Marketable Securities
Marketable securities	8,356	10,944
Corporate debt securities
Cash and Cash Equivalents, and Marketable Securities
Marketable securities	8,962	9,922
Cash
Cash and Cash Equivalents, and Marketable Securities
Cash and cash equivalents	2,764	2,212
Money market funds
Cash and Cash Equivalents, and Marketable Securities
Cash and cash equivalents	5,991	5,268
U.S. government securities
Cash and Cash Equivalents, and Marketable Securities
Cash and cash equivalents	286	66
U.S. government agency securities
Cash and Cash Equivalents, and Marketable Securities
Cash and cash equivalents	12	25
Certificate of deposits and time deposits
Cash and Cash Equivalents, and Marketable Securities
Cash and cash equivalents	584	440
Corporate debt securities
Cash and Cash Equivalents, and Marketable Securities
Cash and cash equivalents	$ 0	$ 68

Cash and Cash Equivalents, and Marketable Securities - Contractual Maturities of Marketable Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Contractual Maturities of Marketable Securities
Due in one year	$ 8,433
Due in one to five years	23,136
Total marketable securities	$ 31,569	$ 33,632

Cash and Cash Equivalents, and Marketable Securities - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Cash and Cash Equivalents, and Marketable Securities [Abstract]
Gross unrealized losses on marketable securities	$ 514	$ 289
Gross unrealized losses in continuous loss position for 12 months or longer	$ (349)	$ (169)

Fair Value Measurement - Assets Measured at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	$ 31,569	$ 33,632
U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	14,251	12,766
U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	8,356	10,944
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	8,962	9,922
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total cash equivalents and marketable securities	38,442	39,499
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total cash equivalents and marketable securities	28,896	29,069
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total cash equivalents and marketable securities	9,546	10,430
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total cash equivalents and marketable securities	0	0
Fair Value, Measurements, Recurring \| U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	14,251	12,766
Fair Value, Measurements, Recurring \| U.S. government securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	14,251	12,766
Fair Value, Measurements, Recurring \| U.S. government securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	0	0
Fair Value, Measurements, Recurring \| U.S. government securities \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	0	0
Fair Value, Measurements, Recurring \| U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	8,356	10,944
Fair Value, Measurements, Recurring \| U.S. government agency securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	8,356	10,944
Fair Value, Measurements, Recurring \| U.S. government agency securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	0	0
Fair Value, Measurements, Recurring \| U.S. government agency securities \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	0	0
Fair Value, Measurements, Recurring \| Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	8,962	9,922
Fair Value, Measurements, Recurring \| Corporate debt securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	0	0
Fair Value, Measurements, Recurring \| Corporate debt securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	8,962	9,922
Fair Value, Measurements, Recurring \| Corporate debt securities \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	0	0
Fair Value, Measurements, Recurring \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	5,991	5,268
Fair Value, Measurements, Recurring \| Money market funds \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	5,991	5,268
Fair Value, Measurements, Recurring \| Money market funds \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
Fair Value, Measurements, Recurring \| Money market funds \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
Fair Value, Measurements, Recurring \| U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	286	66
Fair Value, Measurements, Recurring \| U.S. government securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	286	66
Fair Value, Measurements, Recurring \| U.S. government securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
Fair Value, Measurements, Recurring \| U.S. government securities \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
Fair Value, Measurements, Recurring \| U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	12	25
Fair Value, Measurements, Recurring \| U.S. government agency securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	12	25
Fair Value, Measurements, Recurring \| U.S. government agency securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
Fair Value, Measurements, Recurring \| U.S. government agency securities \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
Fair Value, Measurements, Recurring \| Certificate of deposits and time deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	584	440
Fair Value, Measurements, Recurring \| Certificate of deposits and time deposits \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
Fair Value, Measurements, Recurring \| Certificate of deposits and time deposits \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	584	440
Fair Value, Measurements, Recurring \| Certificate of deposits and time deposits \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	$ 0	0
Fair Value, Measurements, Recurring \| Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents		68
Fair Value, Measurements, Recurring \| Corporate debt securities \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents		0
Fair Value, Measurements, Recurring \| Corporate debt securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents		68
Fair Value, Measurements, Recurring \| Corporate debt securities \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents		$ 0

Property and Equipment (Details) - USD ($)	3 Months Ended		9 Months Ended
Property and Equipment (Details) - USD ($)	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Property, Plant and Equipment
Property and equipment, gross	$ 27,196,000,000		$ 27,196,000,000		$ 18,337,000,000
Less: Accumulated depreciation	(6,084,000,000)		(6,084,000,000)		(4,616,000,000)
Property and equipment, net	21,112,000,000		21,112,000,000		13,721,000,000
Interest costs capitalized	0	$ 0	0	$ 0
Land
Property, Plant and Equipment
Property and equipment, gross	890,000,000		890,000,000		798,000,000
Buildings
Property, Plant and Equipment
Property and equipment, gross	6,609,000,000		6,609,000,000		4,909,000,000
Leasehold improvements
Property, Plant and Equipment
Property and equipment, gross	1,576,000,000		1,576,000,000		959,000,000
Network equipment
Property, Plant and Equipment
Property and equipment, gross	11,181,000,000		11,181,000,000		7,998,000,000
Computer software, office equipment and other
Property, Plant and Equipment
Property and equipment, gross	1,025,000,000		1,025,000,000		681,000,000
Construction in progress
Property, Plant and Equipment
Property and equipment, gross	$ 5,915,000,000		$ 5,915,000,000		$ 2,992,000,000

Goodwill and Intangible Assets - Change in Carrying Amount of Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Goodwill
Goodwill beginning	$ 18,221
Goodwill acquired	88
Effect of currency translation adjustment	(5)
Goodwill ending	$ 18,304

Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in years)			3 years 2 months 12 days
Gross Carrying Amount	$ 4,654		$ 4,654		$ 4,604
Accumulated Amortization	(3,203)		(3,203)		(2,720)
Net Carrying Amount	1,451		1,451		1,884
Amortization expense	156	$ 173	$ 483	$ 522
Acquired users
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in years)			3 years
Gross Carrying Amount	2,056		$ 2,056		2,056
Accumulated Amortization	(1,188)		(1,188)		(971)
Net Carrying Amount	868		$ 868		1,085
Acquired technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in years)			1 year 4 months 23 days
Gross Carrying Amount	1,002		$ 1,002		972
Accumulated Amortization	(834)		(834)		(711)
Net Carrying Amount	168		$ 168		261
Acquired patents
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in years)			5 years 9 months 17 days
Gross Carrying Amount	805		$ 805		785
Accumulated Amortization	(548)		(548)		(499)
Net Carrying Amount	257		$ 257		286
Trade names
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in years)			1 year 7 months 6 days
Gross Carrying Amount	629		$ 629		629
Accumulated Amortization	(489)		(489)		(406)
Net Carrying Amount	140		$ 140		223
Other
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in years)			2 years 3 months 17 days
Gross Carrying Amount	162		$ 162		162
Accumulated Amortization	(144)		(144)		(133)
Net Carrying Amount	$ 18		$ 18		$ 29

Goodwill and Intangible Assets - Estimated Amortization Expense (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
The remainder of 2018	$ 156
2019	551
2020	377
2021	271
2022	31
Thereafter	65
Net Carrying Amount	$ 1,451	$ 1,884

Long-term Debt - Narrative (Details) - Revolving Credit Facility - 2016 Facility - USD ($)	Sep. 30, 2018	May 31, 2016
Debt Instrument
Maximum borrowing capacity		$ 2,000,000,000.0
Amount outstanding	$ 0

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Commitments and Contingencies - Narrative (Details) $ in Millions		3 Months Ended		9 Months Ended
	Jul. 27, 2018 claim	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Operating lease expense		$ 170	$ 91	$ 436	$ 247
Non-cancelable contractual commitment				$ 5,290
Commitment period				5 years
Number of class actions filed \| claim	2

Commitments and Contingencies - Future Minimum Lease Payments (Details) $ in Millions	Sep. 30, 2018 USD ($)
Operating Leases
The remainder of 2018	$ 108
2019	726
2020	873
2021	946
2022	906
Thereafter	8,830
Total minimum lease payments	12,389
Financing Obligation, Future Minimum Payment Due, Fiscal Year Maturity [Abstract]
The remainder of 2018	0
2019	1
2020	9
2021	9
2022	9
Thereafter	91
Total minimum lease payments	119
Financing obligation, building in progress	$ 70

Stockholders' Equity - Share Repurchase Program (Details) - USD ($) shares in Millions	9 Months Ended
	Sep. 30, 2018	Apr. 30, 2018	Nov. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award
Additional authorized repurchase amount		$ 9,000,000,000
Shares repurchased and retired (in shares)	54
Shares repurchased and retired	$ 9,390,000,000
Remaining authorized repurchase amount	$ 3,540,000,000
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award
Share repurchase program, authorized amount			$ 6,000,000,000

Stockholders' Equity - Share-based Compensation Plans (Detail)	9 Months Ended
	Sep. 30, 2018 plan	Jan. 01, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award
Share-based employee compensation plans, number \| plan	2
2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Equity incentive plan shares authorized (in shares) \| shares		67,000,000
Shares reserved for issuance increase, percentage	2.50%

Stockholders' Equity - Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($) $ / shares shares
Class A Common Stock
Aggregate Intrinsic Value
Common stock, closing share price (in usd per share)	$ 164.46
Employee Stock Options
Number of Shares
Beginning balance (in shares) \| shares	3,078
Stock options exercised (in shares) \| shares	(1,398)
Ending balance (in shares) \| shares	1,680
Stock options exercisable as of period end (in shares) \| shares	1,680
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 10.06
Stock options exercised (in dollars per share)	8.06
Ending balance (in dollars per share)	11.72
Stock options exercisable as of period end (in dollars per share)	$ 11.72
Weighted Average Remaining Contractual Term
Balance at period end	1 year 9 months
Stock options exercisable as of period end	1 year 9 months
Aggregate Intrinsic Value
Balance at period end \| $	$ 257
Stock options exercisable as of period end \| $	$ 257

Stockholders' Equity - Restricted Stock Units (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Number of Shares
Unvested at beginning of period (in shares)			81,214
Granted (in shares)			33,015
Vested (in shares)			(34,176)
Forfeited (in shares)			(5,938)
Unvested at end of period (in shares)	74,115		74,115
Weighted Average Grant Date Fair Value
Unvested at beginning of period (in dollars per share)			$ 110.49
Granted (in dollars per share)			172.97
Vested (in dollars per share)			101.64
Forfeited (in dollars per share)			114.33
Unvested at end of period (in dollars per share)	$ 142.08		$ 142.08
Fair value of vested RSUs	$ 2,110	$ 1,730	$ 6,240	$ 4,940

Stockholders' Equity - Additional Award Disclosures (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Equity [Abstract]
Unrecognized share-based compensation expense	$ 9,570
Unrecognized share-based compensation expense recognition period (in years)	3 years

Income Taxes - Income Tax (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
Income Taxes - Income Tax (Details) - USD ($) $ in Millions	Jul. 31, 2016	Sep. 30, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Unrecognized tax benefits		$ 4,260	$ 3,870
Unrecognized tax benefits that would result in tax benefit if realized		2,800
Accrued interest and penalties		310	$ 154
Internal Revenue Service (IRS) \| Tax Year 2010
Income Tax Contingency [Line Items]
Income tax examination, estimate of possible loss	$ 5,000
Internal Revenue Service (IRS) \| Tax Years 2011 Through 2013
Income Tax Contingency [Line Items]
Income tax examination, estimate of possible loss		$ 680

Geographical Information - Property and Equipment, Net (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Long-Lived Assets By Geographical Area
Total property and equipment, net	$ 21,112	$ 13,721
United States
Long-Lived Assets By Geographical Area
Total property and equipment, net	16,038	10,406
Rest of the world
Long-Lived Assets By Geographical Area
Total property and equipment, net	$ 5,074	$ 3,315

Label	Element	Value
Other Assets [Member]
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	$ 97,000,000
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	100,000,000
Prepaid Expenses and Other Current Assets [Member]
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	41,000,000
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	$ 7,000,000