CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Class A and Class B Common Stock, Class C Capital Stock and Additional Paid-In Capital	Accumulated other comprehensive income (loss)	Accumulated other comprehensive income (loss) Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment
Beginning Balance (in shares) at Dec. 31, 2018			695,556
Beginning Balance at Dec. 31, 2018	$ 177,628	$ (34)	$ 45,049	$ (2,306)	$ (30)	$ 134,885	$ (4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common and capital stock issued (in shares)			5,931
Common and capital stock issued	122		$ 122
Stock-based compensation expense	8,215		8,215
Tax withholding related to vesting of restricted stock units and other	(3,636)		$ (3,636)
Repurchases of capital stock (in shares)			(10,581)
Repurchases of capital stock	(12,298)		$ (870)			(11,428)
Sale of interest in consolidated entities	160		$ 160
Net income	23,672					23,672
Other comprehensive income (loss)	1,140			1,140
Ending Balance (in shares) at Sep. 30, 2019			690,906
Ending Balance at Sep. 30, 2019	194,969		$ 49,040	(1,196)		147,125
Beginning Balance (in shares) at Jun. 30, 2019			694,050
Beginning Balance at Jun. 30, 2019	192,192		$ 47,937	(1,091)		145,346
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common and capital stock issued (in shares)			1,616
Common and capital stock issued	49		$ 49
Stock-based compensation expense	2,645		2,645
Tax withholding related to vesting of restricted stock units and other	(1,184)		$ (1,184)
Repurchases of capital stock (in shares)			(4,760)
Repurchases of capital stock	(5,696)		$ (407)			(5,289)
Net income	7,068					7,068
Other comprehensive income (loss)	(105)			(105)
Ending Balance (in shares) at Sep. 30, 2019			690,906
Ending Balance at Sep. 30, 2019	194,969		$ 49,040	(1,196)		147,125
Beginning Balance (in shares) at Dec. 31, 2019			688,335
Beginning Balance at Dec. 31, 2019	201,442		$ 50,552	(1,232)		152,122
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common and capital stock issued (in shares)			6,185
Common and capital stock issued	158		$ 158
Stock-based compensation expense	9,865		9,865
Tax withholding related to vesting of restricted stock units and other	(4,076)		$ (4,076)
Repurchases of capital stock (in shares)			(16,796)
Repurchases of capital stock	(23,245)		$ (1,648)			(21,597)
Sale of interest in consolidated entities	2,456		$ 2,456
Net income	25,042					25,042
Other comprehensive income (loss)	1,278			1,278
Ending Balance (in shares) at Sep. 30, 2020			677,724
Ending Balance at Sep. 30, 2020	212,920		$ 57,307	46		155,567
Beginning Balance (in shares) at Jun. 30, 2020			681,215
Beginning Balance at Jun. 30, 2020	207,322		$ 55,937	(296)		151,681
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common and capital stock issued (in shares)			1,669
Common and capital stock issued	15		$ 15
Stock-based compensation expense	3,230		3,230
Tax withholding related to vesting of restricted stock units and other	(1,339)		$ (1,339)
Repurchases of capital stock (in shares)			(5,160)
Repurchases of capital stock	(7,897)		$ (536)			(7,361)
Net income	11,247					11,247
Other comprehensive income (loss)	342			342
Ending Balance (in shares) at Sep. 30, 2020			677,724
Ending Balance at Sep. 30, 2020	$ 212,920		$ 57,307	$ 46		$ 155,567