Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Number of shares of common stock [Member]	Common stock and additional paid-in capital [Member]	Accumulated deficit [Member]	Accumulated other comprehensive loss [Member]
Beginning Balance, Shares at Dec. 31, 2018		629.6
Balance as of beginning of period at Dec. 31, 2018	$ 12,500		$ 31,246	$ (17,977)	$ (769)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for basic and diluted EPS	1,992			1,992
Other comprehensive income (loss), net of taxes	253				253
Dividends declared on common stock	(879)			(879)
Issuance of common stock in connection with the Company’s equity award programs, Shares		0.7
Issuance of common stock in connection with the Company’s equity award programs	6		6
Stock-based compensation expense	64		64
Tax impact related to employee stock-based compensation expense	(73)		(73)
Repurchases of common stock, Shares		(15.9)
Repurchases of common stock	(3,031)			(3,031)
Ending Balance, Shares at Mar. 31, 2019		614.4
Balance as of end of period at Mar. 31, 2019	10,832		31,243	(19,895)	(516)
Beginning Balance, Shares at Dec. 31, 2018		629.6
Balance as of beginning of period at Dec. 31, 2018	12,500		31,246	(17,977)	(769)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for basic and diluted EPS	4,171
Ending Balance, Shares at Jun. 30, 2019		602.1
Balance as of end of period at Jun. 30, 2019	10,794		31,313	(20,054)	(465)
Beginning Balance, Shares at Mar. 31, 2019		614.4
Balance as of beginning of period at Mar. 31, 2019	10,832		31,243	(19,895)	(516)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for basic and diluted EPS	2,179			2,179
Other comprehensive income (loss), net of taxes	51				51
Issuance of common stock in connection with the Company’s equity award programs, Shares		0.8
Issuance of common stock in connection with the Company’s equity award programs	23		23
Stock-based compensation expense	97		97
Tax impact related to employee stock-based compensation expense	(50)		(50)
Repurchases of common stock, Shares		(13.1)
Repurchases of common stock	(2,349)			(2,349)
Other	11			11
Ending Balance, Shares at Jun. 30, 2019		602.1
Balance as of end of period at Jun. 30, 2019	10,794		31,313	(20,054)	(465)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of changes in accounting principles, net of taxes	$ (2)			(2)
Beginning Balance, Shares at Dec. 31, 2019	591.4	591.4
Balance as of beginning of period at Dec. 31, 2019	$ 9,673		31,531	(21,330)	(528)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for basic and diluted EPS	1,825			1,825
Other comprehensive income (loss), net of taxes	(134)				(134)
Dividends declared on common stock	(938)			(938)
Issuance of common stock in connection with the Company’s equity award programs, Shares		0.9
Issuance of common stock in connection with the Company’s equity award programs	10		10
Stock-based compensation expense	52		52
Tax impact related to employee stock-based compensation expense	(68)		(68)
Repurchases of common stock, Shares		(4.3)
Repurchases of common stock	(933)			(933)
Ending Balance, Shares at Mar. 31, 2020		588.0
Balance as of end of period at Mar. 31, 2020	$ 9,485		31,525	(21,378)	(662)
Beginning Balance, Shares at Dec. 31, 2019	591.4	591.4
Balance as of beginning of period at Dec. 31, 2019	$ 9,673		31,531	(21,330)	(528)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for basic and diluted EPS	$ 3,628
Ending Balance, Shares at Jun. 30, 2020	586.4	586.4
Balance as of end of period at Jun. 30, 2020	$ 10,659		31,610	(20,168)	(783)
Beginning Balance, Shares at Mar. 31, 2020		588.0
Balance as of beginning of period at Mar. 31, 2020	9,485		31,525	(21,378)	(662)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income for basic and diluted EPS	1,803			1,803
Other comprehensive income (loss), net of taxes	(121)				(121)
Issuance of common stock in connection with the Company’s equity award programs, Shares		1.0
Issuance of common stock in connection with the Company’s equity award programs	65		65
Stock-based compensation expense	101		101
Tax impact related to employee stock-based compensation expense	(81)		(81)
Repurchases of common stock, Shares		(2.6)
Repurchases of common stock	(591)			(591)
Other	$ (2)			(2)
Ending Balance, Shares at Jun. 30, 2020	586.4	586.4
Balance as of end of period at Jun. 30, 2020	$ 10,659		$ 31,610	$ (20,168)	$ (783)