Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Cumulative effect of changes in accounting principles, net of taxes	Number of shares of common stock	Common stock and additional paid-in capital	Accumulated deficit	Accumulated deficit Cumulative effect of changes in accounting principles, net of taxes	Accumulated other comprehensive (loss) income
Beginning Balance, Shares at Dec. 31, 2018			629.6
Beginning Balance at Dec. 31, 2018	$ 12,500			$ 31,246	$ (17,977)		$ (769)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,842				7,842
Other comprehensive income (loss), net of tax	241						241
Dividends declared on common stock	(3,555)				(3,555)
Issuance of common stock in connection with the Company’s equity award programs, Shares			2.0
Issuance of common stock in connection with the Company’s equity award programs	97			97
Stock-based compensation expense	323			323
Tax impact related to employee stock-based compensation expense	(135)			(135)
Repurchases of common stock, Shares			(40.2)
Repurchases of common stock	(7,640)				(7,640)
Ending Balance, Shares at Dec. 31, 2019			591.4
Ending Balance at Dec. 31, 2019	9,673	$ (2)		31,531	(21,330)	$ (2)	(528)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,264				7,264
Other comprehensive income (loss), net of tax	(457)						(457)
Dividends declared on common stock	(3,843)				(3,843)
Issuance of common stock in connection with the Company’s equity award programs, Shares			2.1
Issuance of common stock in connection with the Company’s equity award programs	91			91
Stock-based compensation expense	349			349
Tax impact related to employee stock-based compensation expense	(169)			(169)
Repurchases of common stock, Shares			(15.2)
Repurchases of common stock	$ (3,497)				(3,497)
Ending Balance, Shares at Dec. 31, 2020	578.3		578.3
Ending Balance at Dec. 31, 2020	$ 9,409			31,802	(21,408)		(985)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,893				5,893
Other comprehensive income (loss), net of tax	189						189
Dividends declared on common stock	(4,098)				(4,098)
Issuance of common stock in connection with the Company’s equity award programs, Shares			1.7
Issuance of common stock in connection with the Company’s equity award programs	82			82
Stock-based compensation expense	361			361
Tax impact related to employee stock-based compensation expense	(149)			(149)
Repurchases of common stock, Shares			(21.7)
Repurchases of common stock	$ (4,987)				(4,987)
Ending Balance, Shares at Dec. 31, 2021	558.3		558.3
Ending Balance at Dec. 31, 2021	$ 6,700			$ 32,096	$ (24,600)		$ (796)