Cover Page - shares	9 Months Ended
Cover Page - shares	Sep. 30, 2019	Oct. 25, 2019
Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2019
Document Transition Report	false
Entity File Number	001-35551
Entity Registrant Name	Facebook, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-1665019
Entity Address, Address Line One	1601 Willow Road
Entity Address, City or Town	Menlo Park
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94025
City Area Code	650
Local Phone Number	543-4800
Title of 12(b) Security	Class A Common Stock, par value $0.000006
Trading Symbol	FB
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001326801
Current Fiscal Year End Date	--12-31
Class A Common Stock
Entity Information
Entity Common Stock, Shares Outstanding		2,406,468,226
Class B Common Stock
Entity Information
Entity Common Stock, Shares Outstanding		445,278,305

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 15,979	$ 10,019
Marketable securities	36,290	31,095
Accounts receivable, net of allowances of $301 and $229 as of September 30, 2019 and December 31, 2018, respectively	7,673	7,587
Prepaid expenses and other current assets	2,137	1,779
Total current assets	62,079	50,480
Property and equipment, net	32,284	24,683
Operating lease right-of-use assets, net	8,403
Intangible assets, net	853	1,294
Goodwill	18,338	18,301
Other assets	2,461	2,576
Total assets	124,418	97,334
Current liabilities:
Accounts payable	860	820
Partners payable	590	541
Operating lease liabilities, current	776
Accrued expenses and other current liabilities	10,877	5,509
Deferred revenue and deposits	225	147
Total current liabilities	13,328	7,017
Operating lease liabilities, non-current	8,356
Other liabilities	8,735	6,190
Total liabilities	30,419	13,207
Commitments and contingencies
Stockholders' equity:
Common stock, $0.000006 par value; 5,000 million Class A shares authorized, 2,408 million and 2,385 million shares issued and outstanding, as of September 30, 2019 and December 31, 2018, respectively; 4,141 million Class B shares authorized, 446 million and 469 million shares issued and outstanding, as of September 30, 2019 and December 31, 2018, respectively.	0	0
Additional paid-in capital	45,059	42,906
Accumulated other comprehensive loss	(849)	(760)
Retained earnings	49,789	41,981
Total stockholders' equity	93,999	84,127
Total liabilities and stockholders' equity	$ 124,418	$ 97,334

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Accounts receivable, allowances for doubtful accounts	$ 301	$ 229
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)	2,408,000,000	2,385,000,000
Common stock, shares outstanding (in shares)	2,408,000,000	2,385,000,000
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)	446,000,000	469,000,000
Common stock, shares outstanding (in shares)	446,000,000	469,000,000

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue	$ 17,652	$ 13,727	$ 49,615	$ 38,924
Costs and expenses:
Cost of revenue	3,155	2,418	9,279	6,559
Research and development	3,548	2,657	9,722	7,418
Marketing and sales	2,416	1,928	6,850	5,379
General and administrative	1,348	943	8,636	2,475
Total costs and expenses	10,467	7,946	34,487	21,831
Income from operations	7,185	5,781	15,128	17,093
Interest and other income, net	144	131	515	297
Income before provision for income taxes	7,329	5,912	15,643	17,390
Provision for income taxes	1,238	775	4,507	2,160
Net income	6,091	5,137	11,136	15,230
Less: Net income attributable to participating securities	0	0	0	(1)
Net income attributable to Class A and Class B common stockholders	$ 6,091	$ 5,137	$ 11,136	$ 15,229
Earnings per share attributable to Class A and Class B common stockholders:
Basic (in dollars per share)	$ 2.13	$ 1.78	$ 3.90	$ 5.26
Diluted (in dollars per share)	$ 2.12	$ 1.76	$ 3.87	$ 5.20
Weighted-average shares used to compute earnings per share attributable to Class A and Class B common stockholders:
Basic (in shares)	2,854	2,885	2,855	2,895
Diluted (in shares)	2,874	2,913	2,875	2,931
Share-based compensation expense included in costs and expenses:
Share-based compensation expense	$ 1,249	$ 1,040	$ 3,562	$ 3,180
Cost of revenue
Share-based compensation expense included in costs and expenses:
Share-based compensation expense	91	72	287	202
Research and development
Share-based compensation expense included in costs and expenses:
Share-based compensation expense	907	748	2,557	2,347
Marketing and sales
Share-based compensation expense included in costs and expenses:
Share-based compensation expense	148	133	421	380
General and administrative
Share-based compensation expense included in costs and expenses:
Share-based compensation expense	$ 103	$ 87	$ 297	$ 251

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 6,091	$ 5,137	$ 11,136	$ 15,230
Other comprehensive income (loss):
Change in foreign currency translation adjustment, net of tax	(418)	(44)	(503)	(321)
Change in unrealized gain/loss on available-for-sale investments and other, net of tax	52	(15)	414	(198)
Comprehensive income	$ 5,725	$ 5,078	$ 11,047	$ 14,711

- 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 - USD ($) shares in Millions, $ in Millions	Total	Class A and Class B Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings
Balances 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)		37
Issuance of common stock	11		11
Shares withheld related to net share settlement and other (in shares)		(15)
Shares withheld related to net share settlement	(2,663)		(1,423)		(1,240)
Share-based compensation	3,180		3,180
Share repurchases (in shares)		(54)
Share repurchases	(9,385)				(9,385)
Other comprehensive loss	(519)			(519)
Net income	15,230				15,230
Balances 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
Balances 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)		12
Issuance of common stock	3		3
Shares withheld related to net share settlement and other (in shares)		(5)
Shares withheld related to net share settlement	(905)		(523)		(382)
Share-based compensation	1,040		1,040
Share repurchases (in shares)		(24)
Share repurchases	(4,256)				(4,256)
Other comprehensive loss	(59)			(59)
Net income	5,137				5,137
Balances 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
Balances at beginning of period (in shares) at Dec. 31, 2018		2,854
Balances at beginning of period at Dec. 31, 2018	84,127	$ 0	42,906	(760)	41,981
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)		25
Issuance of common stock	14		14
Shares withheld related to net share settlement and other (in shares)		(10)
Shares withheld related to net share settlement	(1,954)		(1,423)		(531)
Share-based compensation	3,562		3,562
Share repurchases (in shares)		(15)
Share repurchases	(2,797)				(2,797)
Other comprehensive loss	(89)			(89)
Net income	11,136				11,136
Balances at end of period (in shares) at Sep. 30, 2019		2,854
Balances at end of period at Sep. 30, 2019	93,999	$ 0	45,059	(849)	49,789
Balances at beginning of period (in shares) at Jun. 30, 2019		2,854
Balances at beginning of period at Jun. 30, 2019	88,762	$ 0	44,277	(483)	44,968
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)		9
Issuance of common stock	5		5
Shares withheld related to net share settlement and other (in shares)		(3)
Shares withheld related to net share settlement	(591)		(472)		(119)
Share-based compensation	1,249		1,249
Share repurchases (in shares)		(6)
Share repurchases	(1,151)				(1,151)
Other comprehensive loss	(366)			(366)
Net income	6,091				6,091
Balances at end of period (in shares) at Sep. 30, 2019		2,854
Balances at end of period at Sep. 30, 2019	$ 93,999	$ 0	$ 45,059	$ (849)	$ 49,789

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net income	$ 11,136	$ 15,230
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,273	3,090
Share-based compensation	3,562	3,180
Deferred income taxes	358	83
Other	44	19
Changes in assets and liabilities:
Accounts receivable	(264)	(328)
Prepaid expenses and other current assets	(527)	(889)
Other assets	66	(99)
Operating lease right-of-use assets	(2,890)
Accounts payable	2	88
Partners payable	59	116
Accrued expenses and other current liabilities	6,439	1,044
Deferred revenue and deposits	82	20
Operating lease liabilities, non-current	2,914
Other liabilities	1,977	102
Net cash provided by operating activities	27,231	21,656
Cash flows from investing activities
Purchases of property and equipment, net	(11,002)	(9,614)
Purchases of marketable securities	(19,152)	(12,658)
Sales of marketable securities	7,402	11,104
Maturities of marketable securities	7,048	3,391
Other investing activities, net	(124)	(141)
Net cash used in investing activities	(15,828)	(7,918)
Cash flows from financing activities
Taxes paid related to net share settlement of equity awards	(1,710)	(2,663)
Repurchases of Class A common stock	(2,906)	(9,379)
Principal payments on finance leases	(411)	0
Net change in overdraft in cash pooling entities	(260)	0
Other financing activities, net	14	11
Net cash used in financing activities	(5,273)	(12,031)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(174)	(167)
Net increase in cash, cash equivalents, and restricted cash	5,956	1,540
Cash, cash equivalents, and restricted cash at beginning of the period	10,124	8,204
Cash, cash equivalents, and restricted cash at end of the period	16,080	9,744
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	15,979	9,637
Total cash, cash equivalents, and restricted cash	10,124	8,204
Cash paid during the period for:
Interest	9	0
Income taxes, net	2,528	2,728
Non-cash investing activities:
Net change in prepaids and liabilities related to property and equipment	(59)	613
Property and equipment in accounts payable and accrued liabilities	$ 1,850	$ 1,504

Summary of Significant Accounting Policies	9 Months Ended
Summary of Significant Accounting Policies	Sep. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	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 (SEC) 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 year ended December 31, 2018. The condensed consolidated balance sheet as of December 31, 2018 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., its wholly owned subsidiaries, and any variable interest entities for which we are deemed to be the primary beneficiary. 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, 2019. 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. Accounting Pronouncement Not Yet Adopted In June 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13), which requires the measurement and recognition of expected credit losses for financial assets held at amortized cost. ASU 2016-13 replaces the existing incurred loss impairment model with a forward-looking expected credit loss model which will result in earlier recognition of credit losses. We will adopt the new standard effective January 1, 2020. While we are currently finalizing the implementation of this new guidance, we do not expect the adoption of this guidance to have a material impact on our consolidated financial statements. Recently Adopted Accounting Pronouncement On January 1, 2019, we adopted Accounting Standards Update No. 2016-02, Leases (Topic 842) (ASU 2016-02), as amended, which supersedes the lease accounting guidance under Topic 840, and generally requires lessees to recognize operating and financing lease liabilities and corresponding right-of-use (ROU) assets on the balance sheet and to provide enhanced disclosures surrounding the amount, timing and uncertainty of cash flows arising from leasing arrangements. We adopted the new guidance using the modified retrospective transition approach by applying the new standard to all leases existing at the date of initial application and not restating comparative periods. The most significant impact was the recognition of ROU assets and lease liabilities for operating leases, while our accounting for finance leases remained substantially unchanged. For information regarding the impact of Topic 842 adoption, see Significant Accounting Policies - Leases and Note 7— Leases. Significant Accounting Policies - Leases On January 1, 2019, we adopted Topic 842 using the modified retrospective transition approach by applying the new standard to all leases existing at the date of initial application. Results and disclosure requirements for reporting periods beginning after January 1, 2019 are presented under Topic 842, while prior period amounts have not been adjusted and continue to be reported in accordance with our historical accounting under Topic 840. We elected the package of practical expedients permitted under the transition guidance, which allowed us to carryforward our historical lease classification, our assessment on whether a contract was or contains a lease, and our initial direct costs for any leases that existed prior to January 1, 2019. We also elected to combine our lease and non-lease components and to keep leases with an initial term of 12 months or less off the balance sheet and recognize the associated lease payments in the consolidated statements of income on a straight-line basis over the lease term. Additionally, for certain equipment leases, we apply a portfolio approach to effectively account for the operating lease ROU assets and liabilities. Upon adoption, we recognized total ROU assets of $6.63 billion, with corresponding liabilities of $6.35 billion on the condensed consolidated balance sheets. This included $761 million of pre-existing finance lease ROU assets previously reported in the network equipment within property and equipment, net. The ROU assets include adjustments for prepayments and accrued lease payments. The adoption did not impact our beginning retained earnings, or our prior year condensed consolidated statements of income and statements of cash flows. Under Topic 842, we determine if an arrangement is a lease at inception. ROU assets and liabilities are recognized at commencement date based on the present value of remaining lease payments over the lease term. For this purpose, we consider only payments that are fixed and determinable at the time of commencement. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. Our incremental borrowing rate is a hypothetical rate based on our understanding of what our credit rating would be. The ROU asset also includes any lease payments made prior to commencement and is recorded net of any lease incentives received. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise such options. Operating leases are included in operating lease right-of-use assets, operating lease liabilities, current and operating lease liabilities, non-current on our condensed consolidated balance sheets. Finance leases are included in property and equipment, net, accrued expenses and other current liabilities, and other liabilities on our condensed consolidated balance sheets.

Revenue

9 Months Ended

Sep. 30, 2019

Revenue from Contract with Customer [Abstract]

Revenue

e disaggregated by revenue source for the three and nine months ended September 30, 2019 and 2018, consists of the following (in millions):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Advertising	$	17,383	$	13,539	$	48,919	$	38,373
Payments and other fees	269		188		696		551
Total revenue	$	17,652	$	13,727	$	49,615	$	38,924

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,
	2019		2018		2019		2018
Revenue:
US & Canada⁽¹⁾	$	8,026	$	6,325	$	22,435	$	17,750
Europe⁽²⁾	4,053		3,234		11,774		9,568
Asia-Pacific	3,958		3,007		10,923		8,253
Rest of World⁽²⁾	1,615		1,161		4,483		3,353
Total revenue	$	17,652	$	13,727	$	49,615	$	38,924

^{(1) United States revenue was}^{$7.54 billion}^and^{$5.93 billion}^{for the}^{three months ended}^{September 30, 2019}^and²⁰¹⁸^{, respectively, and}^{$21.05 billion}^and^{$16.62 billion} ^{for the}^nine^{months ended}^{September 30, 2019} ^and²⁰¹⁸^{, respectively.}

^{(2) Europe includes Russia and Turkey, and Rest of World includes Africa, Latin America, and the Middle East.}

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



	September 30, 2019		December 31, 2018
Deferred revenue	$	192	$	117
Deposits	33		30
Total deferred revenue and deposits	$	225	$	147

Earnings per Share

9 Months Ended

Sep. 30, 2019

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, including awards under our equity compensation plans. In 2018, the calculation of diluted EPS also included the effect of 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, 2019 and 2018, 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,
	2019					2018					2019					2018
	Class A		Class B			Class A		Class B			Class A		Class B			Class A			Class B
Basic EPS:
Numerator
Net income	$	5,138	$	953		$	4,293	$	844		$	9,372	$	1,764		$	12,661		$	2,569
Less: Net income attributable to participating securities	—		—			—		—			—		—			(1		)	—
Net income attributable to common stockholders	$	5,138	$	953		$	4,293	$	844		$	9,372	$	1,764		$	12,660		$	2,569
Denominator
Weighted-average shares outstanding	2,407		447			2,411		474			2,403		452			2,407			488
Basic EPS	$	2.13	$	2.13		$	1.78	$	1.78		$	3.90	$	3.90		$	5.26		$	5.26
Diluted EPS:
Numerator
Net income attributable to common stockholders	$	5,138	$	953		$	4,293	$	844		$	9,372	$	1,764		$	12,660		$	2,569
Reallocation of net income attributable to participating securities	—		—			—		—			—		—			1			—
Reallocation of net income as a result of conversion of Class B to Class A common stock	953		—			844		—			1,764		—			2,569			—
Reallocation of net income to Class B common stock	—		(6		)	—		(4		)	—		(9		)	—			(14		)
Net income attributable to common stockholders for diluted EPS	$	6,091	$	947		$	5,137	$	840		$	11,136	$	1,755		$	15,230		$	2,555
Denominator
Number of shares used for basic EPS computation	2,407		447			2,411		474			2,403		452			2,407			488
Conversion of Class B to Class A common stock	447		—			474		—			452		—			488			—
Weighted-average effect of dilutive RSUs and employee stock options	20		—			28		2			20		1			36			3
Number of shares used for diluted EPS computation	2,874		447			2,913		476			2,875		453			2,931			491
Diluted EPS	$	2.12	$	2.12		$	1.76	$	1.76		$	3.87	$	3.87		$	5.20		$	5.20

Cash and Cash Equivalents, and Marketable Securities

9 Months Ended

Sep. 30, 2019

Cash and Cash Equivalents, and Marketable Securities [Abstract]

Cash and Cash Equivalents, and Marketable Securities

Cash and Cash Equivalents and Marketable Securities

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



	September 30, 2019		December 31, 2018
Cash and cash equivalents:
Cash	$	3,871	$	2,713
Money market funds	11,306		6,792
U.S. government securities	540		90
U.S. government agency securities	59		54
Certificate of deposits and time deposits	189		369
Corporate debt securities	14		1
Total cash and cash equivalents	15,979		10,019
Marketable securities:
U.S. government securities	18,599		13,836
U.S. government agency securities	7,464		8,333
Corporate debt securities	10,227		8,926
Total marketable securities	36,290		31,095
Total cash and cash equivalents, and marketable securities	$	52,269	$	41,114

The gross unrealized gains on our marketable securities were $218 million and $24 million as of September 30, 2019 and December 31, 2018, respectively. The gross unrealized losses on our marketable securities were $45 million and $357 million as of September 30, 2019 and December 31, 2018, respectively. In addition, gross unrealized losses that had been in a continuous loss position for 12 months or longer were $35 million and $332 million as of September 30, 2019 and December 31, 2018, respectively. As of September 30, 2019, we considered the unrealized losses 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, 2019
Due in one year	$	12,933
Due after one year to five years	23,357
Total	$	36,290

Fair Value Measurement

9 Months Ended

Sep. 30, 2019

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, 2019		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	$	11,306	$	11,306	$	—	$	—
U.S. government securities	540		540		—		—
U.S. government agency securities	59		59		—		—
Certificate of deposits and time deposits	189		—		189		—
Corporate debt securities	14		—		14		—
Marketable securities:
U.S. government securities	18,599		18,599		—		—
U.S. government agency securities	7,464		7,464		—		—
Corporate debt securities	10,227		—		10,227		—
Total cash equivalents and marketable securities	$	48,398	$	37,968	$	10,430	$	—



			Fair Value Measurement at Reporting Date Using
Description	December 31, 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	$	6,792	$	6,792	$	—	$	—
U.S. government securities	90		90		—		—
U.S. government agency securities	54		54		—		—
Certificate of deposits and time deposits	369		—		369		—
Corporate debt securities	1		—		1		—
Marketable securities:
U.S. government securities	13,836		13,836		—		—
U.S. government agency securities	8,333		8,333		—		—
Corporate debt securities	8,926		—		8,926		—
Total cash equivalents and marketable securities	$	38,401	$	29,105	$	9,296	$	—

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

9 Months Ended

Sep. 30, 2019

Property, Plant and Equipment [Abstract]

Property and Equipment

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



	September 30, 2019			December 31, 2018
Land	$	1,055		$	899
Buildings	9,176			7,401
Leasehold improvements	2,736			1,841
Network equipment	15,486			13,017
Computer software, office equipment and other	1,608			1,187
Finance lease right-of-use assets	1,427			—
Construction in progress	10,442			7,228
Total	41,930			31,573
Less: Accumulated depreciation	(9,646		)	(6,890		)
Property and equipment, net	$	32,284		$	24,683

Construction in progress includes costs mostly related to construction of data centers, network equipment infrastructure to support our data centers around the world, and office buildings. No interest was capitalized for any period presented.

Leases

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Leases

We have entered into various non-cancelable operating lease agreements for certain of our offices, data center, land, colocations and certain network equipment. Our leases have original lease periods expiring between 2019 and 2093. Many leases include one or more options to renew. We do not assume renewals in our determination of the lease term unless the renewals are deemed to be reasonably assured at lease commencement. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants.

The components of lease costs, lease term and discount rate are as follows (in millions):



	Three Months Ended		Nine Months Ended
	September 30, 2019		September 30, 2019
Finance lease cost
Amortization of right-of-use assets	$	51	$	140
Interest	4		9
Operating lease cost	298		818
Variable lease cost and other, net	41		111
Total lease cost	$	394	$	1,078

Weighted-average remaining lease term
Operating leases			13.1 years
Finance leases			15.5 years

Weighted-average discount rate
Operating leases			3.3		%
Finance leases			3.2		%

The following is a schedule, by years, of maturities of lease liabilities as of September 30, 2019 (in millions):



	Operating Leases			Finance Leases
The remainder of 2019	$	200		$	26
2020	1,096			44
2021	1,089			39
2022	992			32
2023	963			32
Thereafter	7,468			373
Total undiscounted cash flows	11,808			546
Less imputed interest	(2,676		)	(115		)
Present value of lease liabilities	$	9,132		$	431

As of September 30, 2019, we have additional operating and finance leases for facilities and network equipment that have not yet commenced with lease obligations of approximately $3.16 billion and $356 million, respectively. These operating and finance leases will commence between the fourth quarter of 2019 and 2022 with lease terms of greater than one year to 25 years. This table does not include lease payments that were not fixed at commencement or modification.

Supplemental cash flow information related to leases are as follows (in millions):



	Nine Months Ended
	September 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	633
Operating cash flows from finance leases	$	8
Financing cash flows from finance leases	$	411
Lease liabilities arising from obtaining right-of-use assets:
Operating leases	$	3,756
Finance leases	$	128

Leases

We have entered into various non-cancelable operating lease agreements for certain of our offices, data center, land, colocations and certain network equipment. Our leases have original lease periods expiring between 2019 and 2093. Many leases include one or more options to renew. We do not assume renewals in our determination of the lease term unless the renewals are deemed to be reasonably assured at lease commencement. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants.

The components of lease costs, lease term and discount rate are as follows (in millions):



	Three Months Ended		Nine Months Ended
	September 30, 2019		September 30, 2019
Finance lease cost
Amortization of right-of-use assets	$	51	$	140
Interest	4		9
Operating lease cost	298		818
Variable lease cost and other, net	41		111
Total lease cost	$	394	$	1,078

Weighted-average remaining lease term
Operating leases			13.1 years
Finance leases			15.5 years

Weighted-average discount rate
Operating leases			3.3		%
Finance leases			3.2		%

The following is a schedule, by years, of maturities of lease liabilities as of September 30, 2019 (in millions):



	Operating Leases			Finance Leases
The remainder of 2019	$	200		$	26
2020	1,096			44
2021	1,089			39
2022	992			32
2023	963			32
Thereafter	7,468			373
Total undiscounted cash flows	11,808			546
Less imputed interest	(2,676		)	(115		)
Present value of lease liabilities	$	9,132		$	431

As of September 30, 2019, we have additional operating and finance leases for facilities and network equipment that have not yet commenced with lease obligations of approximately $3.16 billion and $356 million, respectively. These operating and finance leases will commence between the fourth quarter of 2019 and 2022 with lease terms of greater than one year to 25 years. This table does not include lease payments that were not fixed at commencement or modification.

Supplemental cash flow information related to leases are as follows (in millions):



	Nine Months Ended
	September 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	633
Operating cash flows from finance leases	$	8
Financing cash flows from finance leases	$	411
Lease liabilities arising from obtaining right-of-use assets:
Operating leases	$	3,756
Finance leases	$	128

Goodwill and Intangible Assets

9 Months Ended

Sep. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

During the nine months ended September 30, 2019, we 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, 2019 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, 2019 are as follows (in millions):



Balance as of December 31, 2018	$	18,301
Goodwill acquired	32
Effect of currency translation adjustment	5
Balance as of September 30, 2019	$	18,338

The following table sets forth the major categories of the intangible assets and the weighted‑average remaining useful lives for those assets that are not already fully amortized (in millions):



		September 30, 2019							December 31, 2018
	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	2.0	$	2,056	$	(1,477	)	$	579	$	2,056	$	(1,260	)	$	796
Acquired technology	1.5	1,018		(974		)	44		1,002		(871		)	131
Acquired patents	4.7	805		(611		)	194		805		(565		)	240
Trade names	1.8	629		(600		)	29		629		(517		)	112
Other	3.6	162		(155		)	7		162		(147		)	15
Total intangible assets		$	4,670	$	(3,817	)	$	853	$	4,654	$	(3,360	)	$	1,294

Amortization expense of intangible assets was $145 million and $457 million for the three and nine months ended September 30, 2019, respectively, and $156 million and $483 million for the three and nine months ended September 30, 2018, respectively.

As of September 30, 2019, expected amortization expense for the unamortized acquired intangible assets for the next five years and thereafter is as follows (in millions):



The remainder of 2019	$	101
2020	383
2021	278
2022	34
2023	26
Thereafter	31
Total	$	853

Long-term Debt	9 Months Ended
Long-term Debt	Sep. 30, 2019
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, 2019, no amounts had been drawn down, and we were in compliance with the covenants under this facility.

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Guarantee In 2018, we established a multi-currency notional cash pool for certain of our entities with a third-party bank provider. Actual cash balances are not physically converted and are not commingled between participating legal entities. As part of the notional cash pool agreement, the bank extends overdraft credit to our participating entities as needed, provided that the overall notionally pooled balance of all accounts in the pool at the end of each day is at least zero. In the unlikely event of a default by our collective entities participating in the pool, any overdraft balances incurred would be guaranteed by Facebook, Inc. Other contractual commitments We also have $5.04 billion of non-cancelable contractual commitments as of September 30, 2019, the majority of which is related to network infrastructure and our data center operations. These commitments are primarily due within five years. Legal Matters 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 platform and user data practices as well as 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 our platform and user data practices. On September 25, 2019, the district court granted our motion to dismiss the consolidated putative securities class action, with leave to amend. We believe these lawsuits are without merit, and we are vigorously defending them. In addition, our platform and user data practices, as well as the events surrounding the misuse of certain data by a developer, became the subject of U.S. Federal Trade Commission (FTC), SEC, state attorneys general, and other government inquiries in the United States, Europe, and other jurisdictions. In July 2019, we entered into a settlement and modified consent order to resolve the FTC inquiry, which is pending federal court approval, and we also entered into a final settlement to resolve the SEC inquiry. Among other matters, our settlement with the FTC requires us to pay a penalty of $5.0 billion and to significantly enhance our practices and processes for privacy compliance and oversight. We have recognized the penalty in accrued expenses and other current liabilities on our condensed consolidated balance sheet as of September 30, 2019. On April 1, 2015, a putative class action was filed against us in the U.S. District Court for the Northern District of California by Facebook users alleging that the "tag suggestions" facial recognition feature violates the Illinois Biometric Information Privacy Act, and seeking statutory and punitive damages and injunctive relief. On April 16, 2018, the district court certified a class of Illinois residents, and on May 14, 2018, the district court denied both parties' motions for summary judgment. On May 29, 2018, the U.S. Court of Appeals for the Ninth Circuit granted our petition for review of the class certification order and stayed the proceeding. On August 8, 2019, the Ninth Circuit affirmed the class certification order. We plan to request that the U.S. Supreme Court review the decision of the Ninth Circuit. The district court has not yet scheduled a trial date, but it could be scheduled as early as the first quarter of 2020. Although we believe this lawsuit is without merit, and we are vigorously defending it, we believe there is a reasonable possibility that the ultimate potential loss related to this matter could be material. 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 (IDPC) and other government inquiries. 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. From time to time we also notify the IDPC, our designated European privacy regulator under the General Data Protection Regulation, of certain other personal data breaches and privacy issues, and are subject to inquiries and investigations regarding various aspects of our regulatory compliance. With respect to the cases, actions, and inquiries described above, we evaluate the associated developments on a regular basis and accrue a liability when we believe a loss is probable and the amount can be reasonably estimated. In addition, we believe there is a reasonable possibility that we may incur a loss in some of these matters. With respect to the matters described above that do not include an estimate of the amount of loss or range of possible loss, such losses or range of possible losses either cannot be estimated or are not individually material, but we believe there is a reasonable possibility that they may be material in the aggregate. 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 other matters, we evaluate the associated developments on a regular basis and accrue a liability when we believe a loss is probable and the amount can be reasonably estimated. In addition, we believe there is a reasonable possibility that we may incur a loss in some of these other matters. We believe that the amount of losses or any estimable range of possible losses with respect to these other matters will not, either individually or in the aggregate, have a material adverse effect on our business and consolidated financial statements. However, the outcome of the legal matters described in this section 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 12 — Income Taxes.

Stockholders' Equity

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Stockholders' Equity

Share Repurchase Program

Our board of directors has authorized a share repurchase program that commenced in 2017 and does not have an expiration date. In December 2018, our board of directors authorized an additional $9.0 billion of repurchases under this program. During the nine months ended September 30, 2019, we repurchased and subsequently retired 15.4 million shares of our Class A common stock for an aggregate amount of $2.80 billion. As of September 30, 2019, $6.20 billion remained available and authorized for repurchases.

The timing and actual number of shares repurchased under the share repurchase 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. Shares that are withheld in connection with the net settlement of RSUs or forfeited under our Stock Plans are added to the reserves of the Amended 2012 Plan. We account for forfeitures as they occur.

Effective January 1, 2019, there were 143 million shares of our Class A common stock reserved for future 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 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 for our unvested RSUs for the nine months ended September 30, 2019:



	Unvested RSUs
	Number of Shares		Weighted-Average Grant Date Fair Value
	(in thousands)
Unvested at December 31, 2018	67,298		$	144.77
Granted	46,999		$	169.77
Vested	(25,231	)	$	139.14
Forfeited	(7,740	)	$	142.28
Unvested at September 30, 2019	81,326		$	161.21

The fair value as of the respective vesting dates of RSUs that vested during the three and nine months ended September 30, 2019 was $1.53 billion and $4.42 billion, respectively, and $2.11 billion and $6.24 billion during the three and nine months ended September 30, 2018, respectively.

As of September 30, 2019, there was $12.28 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	9 Months Ended
Income Taxes	Sep. 30, 2019
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 2019 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%, the provision for income taxes recorded as a result of the developments in Altera Corp. v. Commissioner discussed below, the $5.0 billion of legal accruals recorded in the first six months of 2019 related to the FTC settlement that is not expected to be tax-deductible, and the recognition of excess tax benefits from share-based compensation. Our gross unrecognized tax benefits were $7.16 billion and $4.68 billion on September 30, 2019 and December 31, 2018, respectively. If the gross unrecognized tax benefits as of September 30, 2019 were realized in a subsequent period, this would result in a tax benefit of $4.25 billion within our provision of income taxes at such time. The amount of interest and penalties accrued was $618 million and $340 million as of September 30, 2019 and December 31, 2018, respectively. We expect to continue to accrue unrecognized tax benefits for certain recurring tax positions. On July 27, 2015, the United States Tax Court issued a decision (Tax Court Decision) in Altera Corp. v. Commissioner, which concluded that related parties in a cost sharing arrangement are not required to share expenses related to share-based compensation. The Tax Court Decision was appealed by the Commissioner to the Ninth Circuit Court of Appeals (Ninth Circuit). On June 7, 2019, a three-judge panel from the Ninth Circuit issued an opinion (Altera Ninth Circuit Panel Opinion) that reversed the Tax Court Decision. Based on the Altera Ninth Circuit Panel Opinion, we recorded a cumulative income tax expense of $1.11 billion in the second quarter of 2019. On July 22, 2019, the taxpayer requested a rehearing before the full Ninth Circuit and may subsequently appeal from the Ninth Circuit to the Supreme Court. As a result, the final outcome of the case is uncertain. If the Altera Ninth Circuit Panel Opinion is reversed, we would anticipate recording an income tax benefit at that time. 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 and subsequent tax years remain 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 stated that it will also apply its position for tax years subsequent to 2010. We do not agree with the position of the IRS and have filed a petition in the Tax Court challenging the Notice. The case is scheduled for trial beginning in February 2020. In October 2019, the IRS filed its Statement of Position in the case stating that it planned to assert at trial an adjustment that is higher than the adjustment stated in the Notice. The IRS did not provide a specific amount for the adjustment nor any information about how it intends to apply the revised adjustment to future years. Based on the limited information provided, we believe that, if the IRS prevails in its updated position, this could result in an additional federal tax liability of an estimated, aggregate amount of up to approximately $9.0 billion in excess of the amounts in our originally filed U.S. return, which is an increase from our previous estimate of up to $5.0 billion, plus interest and any penalties asserted. 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. returns, 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, Income Taxes, that is lower than the potential additional federal tax liability from the positions taken by the IRS in the two Notices and its Statement of Position. 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 2017 Tax Cuts and Jobs Act (Tax Act). As of September 30, 2019, we have not resolved these matters and proceedings continue in the Tax Court. 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

9 Months Ended

Sep. 30, 2019

Segments, Geographical Areas [Abstract]

Geographical Information

The following table sets forth our long-lived assets by geographic area, which consist of property and equipment, net and operating lease right-of-use assets, net (in millions):



	September 30, 2019		December 31, 2018
Long-lived assets:
United States	$	32,459	$	18,950
Rest of the world ⁽¹⁾	8,228		5,733
Total long-lived assets	$	40,687	$	24,683

(1)

No individual country, other than disclosed above, exceeded 10% of our total long-lived assets for any period presented.

Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	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 (SEC) 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 year ended December 31, 2018. The condensed consolidated balance sheet as of December 31, 2018 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., its wholly owned subsidiaries, and any variable interest entities for which we are deemed to be the primary beneficiary. 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, 2019.
Use of Estimates	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.
Accounting Pronouncement Not Yet Adopted and Recently Adopted Accounting Pronouncement	Accounting Pronouncement Not Yet Adopted In June 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13), which requires the measurement and recognition of expected credit losses for financial assets held at amortized cost. ASU 2016-13 replaces the existing incurred loss impairment model with a forward-looking expected credit loss model which will result in earlier recognition of credit losses. We will adopt the new standard effective January 1, 2020. While we are currently finalizing the implementation of this new guidance, we do not expect the adoption of this guidance to have a material impact on our consolidated financial statements. Recently Adopted Accounting Pronouncement On January 1, 2019, we adopted Accounting Standards Update No. 2016-02, Leases (Topic 842) (ASU 2016-02), as amended, which supersedes the lease accounting guidance under Topic 840, and generally requires lessees to recognize operating and financing lease liabilities and corresponding right-of-use (ROU) assets on the balance sheet and to provide enhanced disclosures surrounding the amount, timing and uncertainty of cash flows arising from leasing arrangements. We adopted the new guidance using the modified retrospective transition approach by applying the new standard to all leases existing at the date of initial application and not restating comparative periods. The most significant impact was the recognition of ROU assets and lease liabilities for operating leases, while our accounting for finance leases remained substantially unchanged. For information regarding the impact of Topic 842 adoption, see Significant Accounting Policies - Leases and Note 7— Leases.
Leases	Leases On January 1, 2019, we adopted Topic 842 using the modified retrospective transition approach by applying the new standard to all leases existing at the date of initial application. Results and disclosure requirements for reporting periods beginning after January 1, 2019 are presented under Topic 842, while prior period amounts have not been adjusted and continue to be reported in accordance with our historical accounting under Topic 840. We elected the package of practical expedients permitted under the transition guidance, which allowed us to carryforward our historical lease classification, our assessment on whether a contract was or contains a lease, and our initial direct costs for any leases that existed prior to January 1, 2019. We also elected to combine our lease and non-lease components and to keep leases with an initial term of 12 months or less off the balance sheet and recognize the associated lease payments in the consolidated statements of income on a straight-line basis over the lease term. Additionally, for certain equipment leases, we apply a portfolio approach to effectively account for the operating lease ROU assets and liabilities. Upon adoption, we recognized total ROU assets of $6.63 billion, with corresponding liabilities of $6.35 billion on the condensed consolidated balance sheets. This included $761 million of pre-existing finance lease ROU assets previously reported in the network equipment within property and equipment, net. The ROU assets include adjustments for prepayments and accrued lease payments. The adoption did not impact our beginning retained earnings, or our prior year condensed consolidated statements of income and statements of cash flows. Under Topic 842, we determine if an arrangement is a lease at inception. ROU assets and liabilities are recognized at commencement date based on the present value of remaining lease payments over the lease term. For this purpose, we consider only payments that are fixed and determinable at the time of commencement. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. Our incremental borrowing rate is a hypothetical rate based on our understanding of what our credit rating would be. The ROU asset also includes any lease payments made prior to commencement and is recorded net of any lease incentives received. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise such options. Operating leases are included in operating lease right-of-use assets, operating lease liabilities, current and operating lease liabilities, non-current on our condensed consolidated balance sheets. Finance leases are included in property and equipment, net, accrued expenses and other current liabilities, and other liabilities on our condensed consolidated balance sheets.
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, including awards under our equity compensation plans. In 2018, the calculation of diluted EPS also included the effect of 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.

Revenue (Tables)

9 Months Ended

Sep. 30, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

regated by revenue source for the three and nine months ended September 30, 2019 and 2018, consists of the following (in millions):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Advertising	$	17,383	$	13,539	$	48,919	$	38,373
Payments and other fees	269		188		696		551
Total revenue	$	17,652	$	13,727	$	49,615	$	38,924

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,
	2019		2018		2019		2018
Revenue:
US & Canada⁽¹⁾	$	8,026	$	6,325	$	22,435	$	17,750
Europe⁽²⁾	4,053		3,234		11,774		9,568
Asia-Pacific	3,958		3,007		10,923		8,253
Rest of World⁽²⁾	1,615		1,161		4,483		3,353
Total revenue	$	17,652	$	13,727	$	49,615	$	38,924

^{(1) United States revenue was}^{$7.54 billion}^and^{$5.93 billion}^{for the}^{three months ended}^{September 30, 2019}^and²⁰¹⁸^{, respectively, and}^{$21.05 billion}^and^{$16.62 billion} ^{for the}^nine^{months ended}^{September 30, 2019} ^and²⁰¹⁸^{, respectively.}

^{(2) Europe includes Russia and Turkey, and Rest of World includes Africa, Latin America, and the Middle East.}

Deferred reve

Deferred Revenue and Deposits

ue and deposits consists of the following (in millions):



	September 30, 2019		December 31, 2018
Deferred revenue	$	192	$	117
Deposits	33		30
Total deferred revenue and deposits	$	225	$	147

Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2019

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,
	2019					2018					2019					2018
	Class A		Class B			Class A		Class B			Class A		Class B			Class A			Class B
Basic EPS:
Numerator
Net income	$	5,138	$	953		$	4,293	$	844		$	9,372	$	1,764		$	12,661		$	2,569
Less: Net income attributable to participating securities	—		—			—		—			—		—			(1		)	—
Net income attributable to common stockholders	$	5,138	$	953		$	4,293	$	844		$	9,372	$	1,764		$	12,660		$	2,569
Denominator
Weighted-average shares outstanding	2,407		447			2,411		474			2,403		452			2,407			488
Basic EPS	$	2.13	$	2.13		$	1.78	$	1.78		$	3.90	$	3.90		$	5.26		$	5.26
Diluted EPS:
Numerator
Net income attributable to common stockholders	$	5,138	$	953		$	4,293	$	844		$	9,372	$	1,764		$	12,660		$	2,569
Reallocation of net income attributable to participating securities	—		—			—		—			—		—			1			—
Reallocation of net income as a result of conversion of Class B to Class A common stock	953		—			844		—			1,764		—			2,569			—
Reallocation of net income to Class B common stock	—		(6		)	—		(4		)	—		(9		)	—			(14		)
Net income attributable to common stockholders for diluted EPS	$	6,091	$	947		$	5,137	$	840		$	11,136	$	1,755		$	15,230		$	2,555
Denominator
Number of shares used for basic EPS computation	2,407		447			2,411		474			2,403		452			2,407			488
Conversion of Class B to Class A common stock	447		—			474		—			452		—			488			—
Weighted-average effect of dilutive RSUs and employee stock options	20		—			28		2			20		1			36			3
Number of shares used for diluted EPS computation	2,874		447			2,913		476			2,875		453			2,931			491
Diluted EPS	$	2.12	$	2.12		$	1.76	$	1.76		$	3.87	$	3.87		$	5.20		$	5.20

Cash and Cash Equivalents, and Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2019

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, 2019		December 31, 2018
Cash and cash equivalents:
Cash	$	3,871	$	2,713
Money market funds	11,306		6,792
U.S. government securities	540		90
U.S. government agency securities	59		54
Certificate of deposits and time deposits	189		369
Corporate debt securities	14		1
Total cash and cash equivalents	15,979		10,019
Marketable securities:
U.S. government securities	18,599		13,836
U.S. government agency securities	7,464		8,333
Corporate debt securities	10,227		8,926
Total marketable securities	36,290		31,095
Total cash and cash equivalents, and marketable securities	$	52,269	$	41,114

Marketable Securities by Contractual Maturities

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



	September 30, 2019
Due in one year	$	12,933
Due after one year to five years	23,357
Total	$	36,290

Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2019

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, 2019		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	$	11,306	$	11,306	$	—	$	—
U.S. government securities	540		540		—		—
U.S. government agency securities	59		59		—		—
Certificate of deposits and time deposits	189		—		189		—
Corporate debt securities	14		—		14		—
Marketable securities:
U.S. government securities	18,599		18,599		—		—
U.S. government agency securities	7,464		7,464		—		—
Corporate debt securities	10,227		—		10,227		—
Total cash equivalents and marketable securities	$	48,398	$	37,968	$	10,430	$	—



			Fair Value Measurement at Reporting Date Using
Description	December 31, 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	$	6,792	$	6,792	$	—	$	—
U.S. government securities	90		90		—		—
U.S. government agency securities	54		54		—		—
Certificate of deposits and time deposits	369		—		369		—
Corporate debt securities	1		—		1		—
Marketable securities:
U.S. government securities	13,836		13,836		—		—
U.S. government agency securities	8,333		8,333		—		—
Corporate debt securities	8,926		—		8,926		—
Total cash equivalents and marketable securities	$	38,401	$	29,105	$	9,296	$	—

Property and Equipment (Tables)

9 Months Ended

Sep. 30, 2019

Property, Plant and Equipment [Abstract]

Property and Equipment

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



	September 30, 2019			December 31, 2018
Land	$	1,055		$	899
Buildings	9,176			7,401
Leasehold improvements	2,736			1,841
Network equipment	15,486			13,017
Computer software, office equipment and other	1,608			1,187
Finance lease right-of-use assets	1,427			—
Construction in progress	10,442			7,228
Total	41,930			31,573
Less: Accumulated depreciation	(9,646		)	(6,890		)
Property and equipment, net	$	32,284		$	24,683

Leases (Tables)

9 Months Ended

Sep. 30, 2019

Leases [Abstract]

Components of Lease Costs

The components of lease costs, lease term and discount rate are as follows (in millions):



	Three Months Ended		Nine Months Ended
	September 30, 2019		September 30, 2019
Finance lease cost
Amortization of right-of-use assets	$	51	$	140
Interest	4		9
Operating lease cost	298		818
Variable lease cost and other, net	41		111
Total lease cost	$	394	$	1,078

Weighted-average remaining lease term
Operating leases			13.1 years
Finance leases			15.5 years

Weighted-average discount rate
Operating leases			3.3		%
Finance leases			3.2		%

Supplemental cash flow information related to leases are as follows (in millions):



	Nine Months Ended
	September 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	633
Operating cash flows from finance leases	$	8
Financing cash flows from finance leases	$	411
Lease liabilities arising from obtaining right-of-use assets:
Operating leases	$	3,756
Finance leases	$	128

Finance Lease, Liability, Maturity

The following is a schedule, by years, of maturities of lease liabilities as of September 30, 2019 (in millions):



	Operating Leases			Finance Leases
The remainder of 2019	$	200		$	26
2020	1,096			44
2021	1,089			39
2022	992			32
2023	963			32
Thereafter	7,468			373
Total undiscounted cash flows	11,808			546
Less imputed interest	(2,676		)	(115		)
Present value of lease liabilities	$	9,132		$	431

Operating Lease, Liability, Maturity

The following is a schedule, by years, of maturities of lease liabilities as of September 30, 2019 (in millions):



	Operating Leases			Finance Leases
The remainder of 2019	$	200		$	26
2020	1,096			44
2021	1,089			39
2022	992			32
2023	963			32
Thereafter	7,468			373
Total undiscounted cash flows	11,808			546
Less imputed interest	(2,676		)	(115		)
Present value of lease liabilities	$	9,132		$	431

Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2019

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, 2019 are as follows (in millions):



Balance as of December 31, 2018	$	18,301
Goodwill acquired	32
Effect of currency translation adjustment	5
Balance as of September 30, 2019	$	18,338

Schedule of Intangible Assets

The following table sets forth the major categories of the intangible assets and the weighted‑average remaining useful lives for those assets that are not already fully amortized (in millions):



		September 30, 2019							December 31, 2018
	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	2.0	$	2,056	$	(1,477	)	$	579	$	2,056	$	(1,260	)	$	796
Acquired technology	1.5	1,018		(974		)	44		1,002		(871		)	131
Acquired patents	4.7	805		(611		)	194		805		(565		)	240
Trade names	1.8	629		(600		)	29		629		(517		)	112
Other	3.6	162		(155		)	7		162		(147		)	15
Total intangible assets		$	4,670	$	(3,817	)	$	853	$	4,654	$	(3,360	)	$	1,294

Expected Amortization Expense for Unamortized Acquired Intangible Assets

As of September 30, 2019, expected amortization expense for the unamortized acquired intangible assets for the next five years and thereafter is as follows (in millions):



The remainder of 2019	$	101
2020	383
2021	278
2022	34
2023	26
Thereafter	31
Total	$	853

Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Restricted Stock Units Award Activity

The following table summarizes the activities for our unvested RSUs for the nine months ended September 30, 2019:



	Unvested RSUs
	Number of Shares		Weighted-Average Grant Date Fair Value
	(in thousands)
Unvested at December 31, 2018	67,298		$	144.77
Granted	46,999		$	169.77
Vested	(25,231	)	$	139.14
Forfeited	(7,740	)	$	142.28
Unvested at September 30, 2019	81,326		$	161.21

Geographical Information (Tables)

9 Months Ended

Sep. 30, 2019

Segments, Geographical Areas [Abstract]

Revenue and Property and Equipment by Geographic Area

The following table sets forth our long-lived assets by geographic area, which consist of property and equipment, net and operating lease right-of-use assets, net (in millions):



	September 30, 2019		December 31, 2018
Long-lived assets:
United States	$	32,459	$	18,950
Rest of the world ⁽¹⁾	8,228		5,733
Total long-lived assets	$	40,687	$	24,683

(1)

No individual country, other than disclosed above, exceeded 10% of our total long-lived assets for any period presented.

Summary of Significant Accounting Policies (Details) - Accounting Standards Update 2016-02 $ in Millions	Jan. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset	$ 6,630
Lease liability	6,350
Finance lease, right of use asset	$ 761

Revenue Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 17,652	$ 13,727	$ 49,615	$ 38,924
US & Canada
Disaggregation of Revenue [Line Items]
Revenue	8,026	6,325	22,435	17,750
Europe
Disaggregation of Revenue [Line Items]
Revenue	4,053	3,234	11,774	9,568
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	3,958	3,007	10,923	8,253
Rest of World
Disaggregation of Revenue [Line Items]
Revenue	1,615	1,161	4,483	3,353
United States
Disaggregation of Revenue [Line Items]
Revenue	7,540	5,930	21,050	16,620
Advertising
Disaggregation of Revenue [Line Items]
Revenue	17,383	13,539	48,919	38,373
Payments and other fees
Disaggregation of Revenue [Line Items]
Revenue	$ 269	$ 188	$ 696	$ 551

Revenue Deferred Revenue and Deposits (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Deferred revenue	$ 192	$ 117
Deposits	33	30
Total deferred revenue and deposits	$ 225	$ 147

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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator
Net income	$ 6,091	$ 5,137	$ 11,136	$ 15,230
Less: Net income attributable to participating securities	0	0	0	(1)
Net income attributable to Class A and Class B common stockholders	$ 6,091	$ 5,137	$ 11,136	$ 15,229
Denominator
Number of shares used for basic EPS computation (in shares)	2,854	2,885	2,855	2,895
Basic EPS (in dollars per share)	$ 2.13	$ 1.78	$ 3.90	$ 5.26
Numerator
Net income attributable to common stockholders	$ 6,091	$ 5,137	$ 11,136	$ 15,229
Denominator
Number of shares used for diluted EPS computation (in shares)	2,874	2,913	2,875	2,931
Diluted EPS (in dollars per share)	$ 2.12	$ 1.76	$ 3.87	$ 5.20
Class A Common Stock
Numerator
Net income	$ 5,138	$ 4,293	$ 9,372	$ 12,661
Less: Net income attributable to participating securities	0	0	0	(1)
Net income attributable to Class A and Class B common stockholders	$ 5,138	$ 4,293	$ 9,372	$ 12,660
Denominator
Number of shares used for basic EPS computation (in shares)	2,407	2,411	2,403	2,407
Basic EPS (in dollars per share)	$ 2.13	$ 1.78	$ 3.90	$ 5.26
Numerator
Net income attributable to common stockholders	$ 5,138	$ 4,293	$ 9,372	$ 12,660
Reallocation of net income attributable to participating securities	0	0	0	1
Reallocation of net income as a result of conversion of Class B to Class A common stock	953	844	1,764	2,569
Reallocation of net income to Class B common stock	0	0	0	0
Net income attributable to common stockholders for diluted EPS	$ 6,091	$ 5,137	$ 11,136	$ 15,230
Denominator
Conversion of Class B to Class A common stock (in shares)	447	474	452	488
Weighted average effect of dilutive RSUs and employee stock options (in shares)	20	28	20	36
Number of shares used for diluted EPS computation (in shares)	2,874	2,913	2,875	2,931
Diluted EPS (in dollars per share)	$ 2.12	$ 1.76	$ 3.87	$ 5.20
Class B Common Stock
Numerator
Net income	$ 953	$ 844	$ 1,764	$ 2,569
Less: Net income attributable to participating securities	0	0	0	0
Net income attributable to Class A and Class B common stockholders	$ 953	$ 844	$ 1,764	$ 2,569
Denominator
Number of shares used for basic EPS computation (in shares)	447	474	452	488
Basic EPS (in dollars per share)	$ 2.13	$ 1.78	$ 3.90	$ 5.26
Numerator
Net income attributable to common stockholders	$ 953	$ 844	$ 1,764	$ 2,569
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	(6)	(4)	(9)	(14)
Net income attributable to common stockholders for diluted EPS	$ 947	$ 840	$ 1,755	$ 2,555
Denominator
Conversion of Class B to Class A common stock (in shares)	0	0	0	0
Weighted average effect of dilutive RSUs and employee stock options (in shares)	0	2	1	3
Number of shares used for diluted EPS computation (in shares)	447	476	453	491
Diluted EPS (in dollars per share)	$ 2.12	$ 1.76	$ 3.87	$ 5.20

Cash and Cash Equivalents, and Marketable Securities - Breakout of Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Cash and Cash Equivalents, and Marketable Securities
Cash and cash equivalents	$ 15,979	$ 10,019	$ 9,637
Marketable securities	36,290	31,095
Total cash and cash equivalents, and marketable securities	52,269	41,114
U.S. government securities
Cash and Cash Equivalents, and Marketable Securities
Marketable securities	18,599	13,836
U.S. government agency securities
Cash and Cash Equivalents, and Marketable Securities
Marketable securities	7,464	8,333
Corporate debt securities
Cash and Cash Equivalents, and Marketable Securities
Marketable securities	10,227	8,926
Cash
Cash and Cash Equivalents, and Marketable Securities
Cash and cash equivalents	3,871	2,713
Money market funds
Cash and Cash Equivalents, and Marketable Securities
Cash and cash equivalents	11,306	6,792
U.S. government securities
Cash and Cash Equivalents, and Marketable Securities
Cash and cash equivalents	540	90
U.S. government agency securities
Cash and Cash Equivalents, and Marketable Securities
Cash and cash equivalents	59	54
Certificate of deposits and time deposits
Cash and Cash Equivalents, and Marketable Securities
Cash and cash equivalents	189	369
Corporate debt securities
Cash and Cash Equivalents, and Marketable Securities
Cash and cash equivalents	$ 14	$ 1

Cash and Cash Equivalents, and Marketable Securities - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Cash and Cash Equivalents, and Marketable Securities [Abstract]
Gross unrealized gains on marketable securities	$ 218	$ 24
Gross unrealized losses on marketable securities	45	357
Gross unrealized losses in continuous loss position for 12 months or longer	$ 35	$ 332

Cash and Cash Equivalents, and Marketable Securities - Contractual Maturities of Marketable Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Contractual Maturities of Marketable Securities
Due in one year	$ 12,933
Due after one year to five years	23,357
Total marketable securities	$ 36,290	$ 31,095

Fair Value Measurement - Assets Measured at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	$ 36,290	$ 31,095
Total cash equivalents and marketable securities	48,398	38,401
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	37,968	29,105
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total cash equivalents and marketable securities	10,430	9,296
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Total cash equivalents and marketable securities	0	0
U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	18,599	13,836
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	18,599	13,836
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
U.S. government securities \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	0	0
U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	7,464	8,333
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	7,464	8,333
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
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
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	10,227	8,926
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
Corporate debt securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	10,227	8,926
Corporate debt securities \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	0	0
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	11,306	6,792
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	11,306	6,792
Money market funds \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
Money market funds \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
U.S. government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	540	90
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	540	90
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
U.S. government securities \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	59	54
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	59	54
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
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
Certificate of deposits and time deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	189	369
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
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	189	369
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
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	14	1
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	0
Corporate debt securities \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	14	1
Corporate debt securities \| Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	$ 0	$ 0

Property and Equipment (Details) - USD ($)	9 Months Ended	12 Months Ended
Property and Equipment (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment
Property and equipment, gross	$ 41,930,000,000	$ 31,573,000,000
Less: Accumulated depreciation	(9,646,000,000)	(6,890,000,000)
Property and equipment, net	32,284,000,000	24,683,000,000
Interest costs capitalized	0	0
Land
Property, Plant and Equipment
Property and equipment, gross	1,055,000,000	899,000,000
Buildings
Property, Plant and Equipment
Property and equipment, gross	9,176,000,000	7,401,000,000
Leasehold improvements
Property, Plant and Equipment
Property and equipment, gross	2,736,000,000	1,841,000,000
Network equipment
Property, Plant and Equipment
Property and equipment, gross	15,486,000,000	13,017,000,000
Computer software, office equipment and other
Property, Plant and Equipment
Property and equipment, gross	1,608,000,000	1,187,000,000
Finance lease right-of-use assets
Property, Plant and Equipment
Property and equipment, gross	1,427,000,000	0
Construction in progress
Property, Plant and Equipment
Property and equipment, gross	$ 10,442,000,000	$ 7,228,000,000

Leases - Narrative (Details) $ in Millions	9 Months Ended
Leases - Narrative (Details) $ in Millions	Sep. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease not yet commenced	$ 3,160
Finance lease not yet commenced	$ 356
Minimum
Lessee, Lease, Description [Line Items]
Lease not yet commenced, term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease not yet commenced, term	25 years

Leases - Components of Lease Cost (Details) $ in Millions	3 Months Ended	9 Months Ended
Leases - Components of Lease Cost (Details) $ in Millions	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Finance lease cost
Amortization of right-of-use assets	$ 51	$ 140
Interest	4	9
Operating lease cost	298	818
Variable lease cost and other, net	41	111
Total lease cost	$ 394	$ 1,078
Weighted-average remaining lease term
Operating leases	13 years 1 month 6 days	13 years 1 month 6 days
Finance leases	15 years 6 months	15 years 6 months
Weighted-average discount rate
Operating leases	3.30%	3.30%
Finance leases	3.20%	3.20%

Leases - Maturities of Lease Liabilities (Details) $ in Millions	Sep. 30, 2019 USD ($)
Operating Leases
The remainder of 2019	$ 200
2020	1,096
2021	1,089
2022	992
2023	963
Thereafter	7,468
Total undiscounted cash flows	11,808
Less imputed interest	(2,676)
Present value of lease liabilities	9,132
Finance Leases
The remainder of 2019	26
2020	44
2021	39
2022	32
2023	32
Thereafter	373
Total undiscounted cash flows	546
Less imputed interest	(115)
Present value of lease liabilities	$ 431

Leases - Supplemental Cash Flow (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 633
Operating cash flows from finance leases	8
Financing cash flows from finance leases	411	$ 0
Lease liabilities arising from obtaining right-of-use assets:
Operating leases	3,756
Finance leases	$ 128

Goodwill and Intangible Assets - Change in Carrying Amount of Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Goodwill
Balance as of December 31, 2018	$ 18,301
Goodwill acquired	32
Effect of currency translation adjustment	5
Balance as of September 30, 2019	$ 18,338

Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,670		$ 4,670		$ 4,654
Accumulated Amortization	(3,817)		(3,817)		(3,360)
Net Carrying Amount	853		853		1,294
Amortization expense	145	$ 156	$ 457	$ 483
Acquired users
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Useful Lives (in years)			2 years
Gross Carrying Amount	2,056		$ 2,056		2,056
Accumulated Amortization	(1,477)		(1,477)		(1,260)
Net Carrying Amount	579		$ 579		796
Acquired technology
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Useful Lives (in years)			1 year 6 months
Gross Carrying Amount	1,018		$ 1,018		1,002
Accumulated Amortization	(974)		(974)		(871)
Net Carrying Amount	44		$ 44		131
Acquired patents
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Useful Lives (in years)			4 years 8 months 12 days
Gross Carrying Amount	805		$ 805		805
Accumulated Amortization	(611)		(611)		(565)
Net Carrying Amount	194		$ 194		240
Trade names
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Useful Lives (in years)			1 year 9 months 18 days
Gross Carrying Amount	629		$ 629		629
Accumulated Amortization	(600)		(600)		(517)
Net Carrying Amount	29		$ 29		112
Other
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Remaining Useful Lives (in years)			3 years 7 months 6 days
Gross Carrying Amount	162		$ 162		162
Accumulated Amortization	(155)		(155)		(147)
Net Carrying Amount	$ 7		$ 7		$ 15

Goodwill and Intangible Assets - Estimated Amortization Expense (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
The remainder of 2019	$ 101
2020	383
2021	278
2022	34
2023	26
Thereafter	31
Net Carrying Amount	$ 853	$ 1,294

Long-term Debt - Narrative (Details) - Revolving Credit Facility - 2016 Facility - USD ($)	Sep. 30, 2019	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 (Details) $ in Millions		9 Months Ended
Commitments and Contingencies (Details) $ in Millions	Jul. 27, 2018 claim	Sep. 30, 2019 USD ($)	Jul. 24, 2019 USD ($)
Loss Contingencies [Line Items]
Non-cancelable contractual commitments		$ 5,040
Commitment period		5 years
Number of class actions filed \| claim	2
Loss contingency accrual		$ 5,000
FTC Inquiry
Loss Contingencies [Line Items]
Loss contingency accrual			$ 5,000

Stockholders' Equity - Share Repurchase Program (Details) - USD ($) shares in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Equity [Abstract]
Share repurchase program, authorized amount		$ 9,000,000,000.0
Shares repurchased and retired (in shares)	15.4
Shares repurchased and retired	$ 2,800,000,000
Remaining authorized repurchase amount	$ 6,200,000,000

Stockholders' Equity - Share-based Compensation Plans (Detail)	9 Months Ended
	Sep. 30, 2019 plan	Jan. 01, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award
Share-based employee compensation plans, number \| plan	2
Equity Incentive Plan 2012
Share-based Compensation Arrangement by Share-based Payment Award
Equity incentive plan shares authorized (in shares) \| shares		143,000,000
Shares reserved for issuance increase, percentage	2.50%

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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Number of Shares
Unvested at beginning of period (in shares)			67,298
Granted (in shares)			46,999
Vested (in shares)			(25,231)
Forfeited (in shares)			(7,740)
Unvested at end of period (in shares)	81,326		81,326
Weighted-Average Grant Date Fair Value
Unvested at beginning of period (in dollars per share)			$ 144.77
Granted (in dollars per share)			169.77
Vested (in dollars per share)			139.14
Forfeited (in dollars per share)			142.28
Unvested at end of period (in dollars per share)	$ 161.21		$ 161.21
Fair value of vested RSUs	$ 1,530	$ 2,110	$ 4,420	$ 6,240

Stockholders' Equity - Additional Award Disclosures (Details) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Equity [Abstract]
Unrecognized share-based compensation expense	$ 12,280
Unrecognized share-based compensation expense recognition period (in years)	3 years

Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			9 Months Ended		19 Months Ended	39 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Oct. 30, 2019	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
U.S. statutory rate					21.00%
Loss contingency accrual		$ 5,000			$ 5,000		$ 5,000	$ 5,000
Unrecognized tax benefits		7,160			7,160		7,160	7,160	$ 4,680
Unrecognized tax benefits that would result in tax benefit if realized		4,250			4,250		4,250	4,250
Accrued interest and penalties		618			618		618	618	$ 340
Cumulative income tax expense		$ 1,238		$ 775	$ 4,507	$ 2,160
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
Altera Corp V Commissioner
Income Tax Contingency [Line Items]
Cumulative income tax expense			$ 1,110
Subsequent Event [Member] \| Internal Revenue Service (IRS) \| Tax Year 2010
Income Tax Contingency [Line Items]
Income tax examination, estimate of possible loss	$ 9,000

Geographical Information - Property and Equipment, Net (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Long-Lived Assets By Geographical Area
Total long-lived assets	$ 40,687	$ 24,683
United States
Long-Lived Assets By Geographical Area
Total long-lived assets	32,459	18,950
Rest of the world
Long-Lived Assets By Geographical Area
Total long-lived assets	$ 8,228	$ 5,733

Label	Element	Value
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 141,000,000
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	31,000,000
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	172,000,000
AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(31,000,000)
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(31,000,000)
Other Assets [Member]
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	94,000,000
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	7,000,000
Restricted Cash and Cash Equivalents	us-gaap_RestrictedCashAndCashEquivalents	$ 7,000,000