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)			4,315
Common and capital stock issued	73		$ 73
Stock-based compensation expense	5,570		5,570
Tax withholding related to vesting of restricted stock units and other	(2,452)		$ (2,452)
Repurchases of capital stock (in shares)			(5,821)
Repurchases of capital stock	(6,602)		$ (463)			(6,139)
Sale of interest in consolidated entities	160		$ 160
Net income	16,604					16,604
Other comprehensive income (loss)	1,245			1,245
Ending Balance (in shares) at Jun. 30, 2019			694,050
Ending Balance at Jun. 30, 2019	192,192		$ 47,937	(1,091)		145,346
Beginning Balance (in shares) at Mar. 31, 2019			694,782
Beginning Balance at Mar. 31, 2019	183,472		$ 46,532	(1,780)		138,720
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common and capital stock issued (in shares)			2,403
Common and capital stock issued	34		$ 34
Stock-based compensation expense	2,782		2,782
Tax withholding related to vesting of restricted stock units and other	(1,268)		$ (1,268)
Repurchases of capital stock (in shares)			(3,135)
Repurchases of capital stock	(3,577)		$ (256)			(3,321)
Sale of interest in consolidated entities	113		$ 113
Net income	9,947					9,947
Other comprehensive income (loss)	689			689
Ending Balance (in shares) at Jun. 30, 2019			694,050
Ending Balance at Jun. 30, 2019	192,192		$ 47,937	(1,091)		145,346
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)			4,516
Common and capital stock issued	143		$ 143
Stock-based compensation expense	6,635		6,635
Tax withholding related to vesting of restricted stock units and other	(2,737)		$ (2,737)
Repurchases of capital stock (in shares)			(11,636)
Repurchases of capital stock	(15,348)		$ (1,112)			(14,236)
Sale of interest in consolidated entities	2,456		$ 2,456
Net income	13,795					13,795
Other comprehensive income (loss)	936			936
Ending Balance (in shares) at Jun. 30, 2020			681,215
Ending Balance at Jun. 30, 2020	207,322		$ 55,937	(296)		151,681
Beginning Balance (in shares) at Mar. 31, 2020			683,972
Beginning Balance at Mar. 31, 2020	203,659		$ 53,688	(1,097)		151,068
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common and capital stock issued (in shares)			2,391
Common and capital stock issued	37		$ 37
Stock-based compensation expense	3,413		3,413
Tax withholding related to vesting of restricted stock units and other	(1,558)		$ (1,558)
Repurchases of capital stock (in shares)			(5,148)
Repurchases of capital stock	(6,852)		$ (506)			(6,346)
Sale of interest in consolidated entities	863		$ 863
Net income	6,959					6,959
Other comprehensive income (loss)	801			801
Ending Balance (in shares) at Jun. 30, 2020			681,215
Ending Balance at Jun. 30, 2020	$ 207,322		$ 55,937	$ (296)		$ 151,681