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, 2017			694,783
Beginning Balance at Dec. 31, 2017	$ 152,502	$ (697)	$ 40,247	$ (992)	$ (98)	$ 113,247	$ (599)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common and capital stock issued (in shares)			8,975
Common and capital stock issued	148		$ 148
Stock-based compensation expense	9,353		9,353
Tax withholding related to vesting of restricted stock units and other	(4,782)		$ (4,782)
Repurchases of capital stock (in shares)			(8,202)
Repurchases of capital stock	(9,075)		$ (576)			(8,499)
Sale of interest in consolidated entities	659		659
Net income	30,736					30,736
Other comprehensive income (loss)	(1,216)			(1,216)
Ending Balance at Dec. 31, 2018	177,628	$ (34)	$ 45,049	(2,306)	$ (30)	134,885	$ (4)
Ending Balance (in shares) at Dec. 31, 2018			695,556
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common and capital stock issued (in shares)			8,120
Common and capital stock issued	202		$ 202
Stock-based compensation expense	10,890		10,890
Tax withholding related to vesting of restricted stock units and other	(4,455)		$ (4,455)
Repurchases of capital stock (in shares)			(15,341)
Repurchases of capital stock	(18,396)		$ (1,294)			(17,102)
Sale of interest in consolidated entities	160		160
Net income	34,343					34,343
Other comprehensive income (loss)	1,104			1,104
Ending Balance at Dec. 31, 2019	201,442		$ 50,552	(1,232)		152,122
Ending Balance (in shares) at Dec. 31, 2019			688,335
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common and capital stock issued (in shares)			8,398
Common and capital stock issued	168		$ 168
Stock-based compensation expense	13,123		13,123
Tax withholding related to vesting of restricted stock units and other	(5,969)		$ (5,969)
Repurchases of capital stock (in shares)			(21,511)
Repurchases of capital stock	(31,149)		$ (2,159)			(28,990)
Sale of interest in consolidated entities	2,795		2,795
Net income	40,269					40,269
Other comprehensive income (loss)	1,865			1,865
Ending Balance at Dec. 31, 2020	$ 222,544		$ 58,510	$ 633		$ 163,401
Ending Balance (in shares) at Dec. 31, 2020			675,222