Condensed 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, 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	566			566
Other comprehensive income (loss)	149				149
Common stock repurchases	(10)		150			(160)
Dividends and dividend equivalents	(75)			(75)
Stock-based compensation	33		33
Restricted stock unit vesting	0	$ 0	(13)			13
Restricted stock unit vesting (in shares)		0
Stock option exercises	17	$ 0	17			0
Stock option exercises (in shares)		0
Balances at Mar. 31, 2019	10,841	$ 33	2,722	15,563	(10)	(7,467)
Balances (in shares) at Mar. 31, 2019		198,595
Balances at Dec. 31, 2019	12,037	$ 33	2,820	17,483	156	(8,455)
Balances (in shares) at Dec. 31, 2019		198,630
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	473			473
Other comprehensive income (loss)	(108)				(108)
Common stock repurchases	(17)		0			(17)
Dividends and dividend equivalents	(83)			(83)
Stock-based compensation	36		36
Restricted stock unit vesting	0	$ 0	(6)			6
Restricted stock unit vesting (in shares)		0
Stock option exercises	19	$ 0	7			12
Stock option exercises (in shares)		0
Balances at Mar. 31, 2020	$ 12,355	$ 33	$ 2,857	$ 17,871	$ 48	$ (8,454)
Balances (in shares) at Mar. 31, 2020		198,630