Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Impact of adopting ASC 326	Common Stock	Capital In Excess of Par Value	Retained Earnings	Retained Earnings Impact of adopting ASC 326	Accumulated Other Comprehensive Income (Loss)	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	2,301				2,301
Other comprehensive income (loss)	161						161
Common stock repurchases	(25)			0				(25)
Dividends and dividend equivalents	(166)				(166)
Stock-based compensation	82			82
Restricted stock unit vesting	0		$ 0	(15)				15
Restricted stock unit vesting (in shares)			0
Stock option exercises	28		$ 0	11				17
Stock option exercises (in shares)			0
Balances at Jun. 30, 2020	14,416		$ 33	2,898	19,616		317	(8,448)
Balances (in shares) at Jun. 30, 2020			198,630
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]
Net income	1,828				1,828
Other comprehensive income (loss)	269						269
Common stock repurchases	(8)			0				(8)
Dividends and dividend equivalents	(83)				(83)
Stock-based compensation	46			46
Restricted stock unit vesting	0		$ 0	(9)				9
Restricted stock unit vesting (in shares)			0
Stock option exercises	9		$ 0	4				5
Stock option exercises (in shares)			0
Balances at Jun. 30, 2020	14,416		$ 33	2,898	19,616		317	(8,448)
Balances (in shares) at Jun. 30, 2020			198,630
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	1,416				1,416
Other comprehensive income (loss)	(175)						(175)
Common stock repurchases	(33)			263				(296)
Dividends and dividend equivalents	(182)				(182)
Stock-based compensation	84			84
Restricted stock unit vesting	0		$ 0	(36)				36
Restricted stock unit vesting (in shares)			0
Stock option exercises	5		$ 0	2				3
Stock option exercises (in shares)			0
Balances at Jun. 30, 2021	14,843		$ 33	3,018	21,751		216	(10,175)
Balances (in shares) at Jun. 30, 2021			198,649
Balances at Mar. 31, 2021	14,190		$ 33	2,712	21,252		108	(9,915)
Balances (in shares) at Mar. 31, 2021			198,649
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	588				588
Other comprehensive income (loss)	108						108
Common stock repurchases	(2)			263				(265)
Dividends and dividend equivalents	(89)				(89)
Stock-based compensation	45			45
Restricted stock unit vesting	0		$ 0	(3)				3
Restricted stock unit vesting (in shares)			0
Stock option exercises	3		$ 0	1				2
Stock option exercises (in shares)			0
Balances at Jun. 30, 2021	$ 14,843		$ 33	$ 3,018	$ 21,751		$ 216	$ (10,175)
Balances (in shares) at Jun. 30, 2021			198,649