Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Impact of adopting accounting standard	Common Stock	Capital In Excess of Par Value	Retained Earnings	Retained Earnings Impact of adopting accounting standard	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balances at Dec. 31, 2017	$ 9,842		$ 33	$ 2,445	$ 13,670		$ 19	$ (6,325)
Balances (in shares) at Dec. 31, 2017			198,572
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,683				1,683
Other comprehensive income (loss)	(182)				(4)		(178)
Common stock repurchases	(1,090)			50				(1,140)
Dividends and dividend equivalents	(277)				(277)
Stock-based compensation	137			137
Restricted stock unit vesting	0			(145)				145
Restricted stock unit vesting (in shares)			0
Stock option exercises	48			48				0
Stock option exercises (in shares)			23
Balances at Dec. 31, 2018	10,161		$ 33	2,535	15,072		(159)	(7,320)
Balances (in shares) at Dec. 31, 2018			198,595
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,707				2,707
Other comprehensive income (loss)	315				0		315
Common stock repurchases	(1,070)			150				(1,220)
Dividends and dividend equivalents	(296)				(296)
Stock-based compensation	163			163
Restricted stock unit vesting	0			(48)				48
Restricted stock unit vesting (in shares)			32
Stock option exercises	57			20				37
Stock option exercises (in shares)			3
Balances at Dec. 31, 2019	12,037	$ (2)	$ 33	2,820	17,483	$ (2)	156	(8,455)
Balances (in shares) at Dec. 31, 2019			198,630
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,367				3,367
Other comprehensive income (loss)	235				0		235
Common stock repurchases	(1,820)			(263)				(1,557)
Dividends and dividend equivalents	(331)				(331)
Stock-based compensation	181			181
Restricted stock unit vesting	0			(59)				59
Restricted stock unit vesting (in shares)			19
Stock option exercises	61			26				35
Stock option exercises (in shares)			0
Balances at Dec. 31, 2020	$ 13,728		$ 33	$ 2,705	$ 20,517		$ 391	$ (9,918)
Balances (in shares) at Dec. 31, 2020			198,649