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 (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	2,195				2,195
Other comprehensive income (loss)	336						336
Common stock repurchases	(1,010)			(50)				(960)
Dividends and dividend equivalents	(222)				(222)
Stock-based compensation	119			119
Restricted stock unit vesting	0			(3)				3
Restricted stock unit vesting (in shares)			32
Stock option exercises	22			7				15
Stock option exercises (in shares)			2
Balances at Sep. 30, 2019	11,601		$ 33	2,608	17,045		177	(8,262)
Balances (in shares) at Sep. 30, 2019			198,629
Balances at Dec. 31, 2018	10,161		$ 33	2,535	15,072		(159)	(7,320)
Balances (in shares) at Dec. 31, 2018			198,595
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]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Balances at Jun. 30, 2019	$ 11,872		$ 33	2,763	16,429		112	(7,465)
Balances (in shares) at Jun. 30, 2019			198,628
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	689				689
Other comprehensive income (loss)	65						65
Common stock repurchases	(1,000)			(200)				(800)
Dividends and dividend equivalents	(73)				(73)
Stock-based compensation	43			43
Restricted stock unit vesting	0			0				0
Restricted stock unit vesting (in shares)			0
Stock option exercises	5			2				3
Stock option exercises (in shares)			1
Balances at Sep. 30, 2019	11,601		$ 33	2,608	17,045		177	(8,262)
Balances (in shares) at Sep. 30, 2019			198,629
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	3,641				3,641
Other comprehensive income (loss)	214						214
Common stock repurchases	(30)			0				(30)
Common stock repurchases (in shares)			19
Dividends and dividend equivalents	(250)				(250)
Stock-based compensation	129			129
Restricted stock unit vesting	0			(21)				21
Restricted stock unit vesting (in shares)			0
Stock option exercises	29			12				17
Stock option exercises (in shares)			0
Balances at Sep. 30, 2020	15,768		$ 33	2,940	20,872		370	(8,447)
Balances (in shares) at Sep. 30, 2020			198,649
Balances at Jun. 30, 2020	14,416		$ 33	2,898	19,616		317	(8,448)
Balances (in shares) at Jun. 30, 2020			198,630
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,340				1,340
Other comprehensive income (loss)	53						53
Common stock repurchases	(5)			0				(5)
Common stock repurchases (in shares)			19
Dividends and dividend equivalents	(84)				(84)
Stock-based compensation	47			47
Restricted stock unit vesting	0			(6)				6
Restricted stock unit vesting (in shares)			0
Stock option exercises	1			1				0
Stock option exercises (in shares)			0
Balances at Sep. 30, 2020	$ 15,768		$ 33	$ 2,940	$ 20,872		$ 370	$ (8,447)
Balances (in shares) at Sep. 30, 2020			198,649