Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Paid-in Capital	Retained Earnings	Treasury Common Stock	AOCI
Balance, beginning balance at Dec. 31, 2016		$ 1,741	$ 1,674	$ 33,107	$ (25,523)	$ (526)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 3,682			3,682
Dividends declared and paid				(2,104)
Common stock issued for stock-based awards			(138)		621
Stock repurchases					(2,556)
Stock compensation			242
Other comprehensive income (loss), net of taxes	142					142
Dividend equivalents on RSUs				(17)
Other			(2)	(6)
Balance, ending balance at Dec. 31, 2017		1,741	1,776	34,662	(27,458)	(384)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,580			5,580
Dividends declared and paid				(2,555)
Common stock issued for stock-based awards			(55)		428
Stock repurchases					(5,100)
Stock compensation			232
Other comprehensive income (loss), net of taxes	(59)					(59)
Dividend equivalents on RSUs				(17)
Cumulative effect of accounting changes				236		(30)
Other			(3)
Balance, ending balance at Dec. 31, 2018	8,994	1,741	1,950	37,906	(32,130)	(473)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,017			5,017
Dividends declared and paid				(3,008)
Common stock issued for stock-based awards			(55)		594
Stock repurchases					(2,960)
Stock compensation			217
Other comprehensive income (loss), net of taxes	126					126
Dividend equivalents on RSUs				(17)
Other			(2)		1
Balance, ending balance at Dec. 31, 2019	$ 8,907	$ 1,741	$ 2,110	$ 39,898	$ (34,495)	$ (347)