Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Capital In Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balances at Dec. 31, 2016	$ 10,685	$ 33	$ 2,562	$ 11,454	$ (66)	$ (3,298)
Balances (in shares) at Dec. 31, 2016		198,495
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,448			2,448
Other comprehensive income (loss)	85				85
Common stock repurchases	(3,365)		(200)			(3,165)
Dividends and dividend equivalents	(232)			(232)
Stock-based compensation	157		157
Restricted stock unit vesting	0		(138)			138
Restricted stock unit vesting (in shares)		0
Stock option exercises	64		64
Stock option exercises (in shares)		77
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
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				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	$ 33	$ 2,820	$ 17,483	$ 156	$ (8,455)
Balances (in shares) at Dec. 31, 2019		198,630