Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Number of shares of common stock	Common stock and additional paid-in capital [Member]	Accumulated deficit [Member]	Accumulated other comprehensive loss [Member]
Beginning Balance, Shares at Dec. 31, 2016		738.2
Beginning Balance at Dec. 31, 2016	$ 29,875		$ 30,784	$ (438)	$ (471)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,979			1,979
Other comprehensive income (loss), net of tax	(208)				(208)
Dividends declared on common stock	(3,487)			(3,487)
Issuance of common stock in connection with the Company’s equity award programs, Shares		2.5
Issuance of common stock in connection with the Company’s equity award programs	52		52
Stock-based compensation expense	347		347
Tax impact related to employee stock-based compensation expense	(191)		(191)
Repurchases of common stock, Shares		(18.5)
Repurchases of common stock	(3,126)			(3,126)
Ending Balance, Shares at Dec. 31, 2017		722.2
Ending Balance at Dec. 31, 2017	25,241		30,992	(5,072)	(679)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,394			8,394
Other comprehensive income (loss), net of tax	(81)				(81)
Dividends declared on common stock	(3,482)			(3,482)
Issuance of common stock in connection with the Company’s equity award programs, Shares		1.9
Issuance of common stock in connection with the Company’s equity award programs	56		56
Stock-based compensation expense	327		327
Tax impact related to employee stock-based compensation expense	(129)		(129)
Repurchases of common stock, Shares		(94.5)
Repurchases of common stock	$ (17,855)			(17,855)
Ending Balance, Shares at Dec. 31, 2018	629.6	629.6
Ending 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	591.4
Ending Balance at Dec. 31, 2019	$ 9,673		$ 31,531	$ (21,330)	$ (528)