Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Impact of adoption of ASC 326	Common Stock	Capital In Excess of Par Value	Retained Earnings	Retained Earnings Impact of adoption of ASC 326	Accumulated Other Comprehensive Income	Treasury Stock
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	473				473
Other comprehensive loss	(108)						(108)
Common stock repurchases	(17)			0				(17)
Common stock repurchases (in shares)
Dividends and dividend equivalents	(83)				(83)
Stock-based compensation	36			36
Restricted stock unit vesting	0			(6)				6
Restricted stock unit vesting (in shares)			0
Stock option exercises	19			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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update	us-gaap:AccountingStandardsUpdate201613Member
Balances at Dec. 31, 2020	$ 13,728		$ 33	2,705	20,517		391	(9,918)
Balances (in shares) at Dec. 31, 2020			198,649
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	828				828
Other comprehensive loss	(283)						(283)
Common stock repurchases	(30)			0				(30)
Common stock repurchases (in shares)
Dividends and dividend equivalents	(93)				(93)
Stock-based compensation	39			39
Restricted stock unit vesting	0			(33)				33
Restricted stock unit vesting (in shares)			0
Stock option exercises	1			1				0
Stock option exercises (in shares)			0
Balances at Mar. 31, 2021	$ 14,190		$ 33	$ 2,712	$ 21,252		$ 108	$ (9,915)
Balances (in shares) at Mar. 31, 2021			198,649