Consolidated Statements Of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjusted Balance	Cumulative Effect, Period of Adoption, Adjustment	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive (Loss) Income [Member]	Noncontrolling Interest [Member]
Balance (in shares), Beginning at Dec. 31, 2019				252.9
Total shareholders' equity, Beginning Balance at Dec. 31, 2019				$ 3	$ 9,448	$ 22,573	$ 22,538		$ (296)
Total shareholders' equity, Beginning Balance (Accounting Standards Update 2016-13) at Dec. 31, 2019								$ (35)
Total equity, Beginning Balance at Dec. 31, 2019	$ 31,728	$ 31,693
Total equity, Beginning Balance (Accounting Standards Update 2016-13) at Dec. 31, 2019			$ (35)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' net income						1,523
Shareholders' other comprehensive income (loss)									(712)
Repurchase and retirement of common stock	(529)				(71)	(458)
Repurchase and retirement of common stock, shares				(1.9)
Dividends and dividend equivalents	(243)					(243)
Issuance of common stock under employee stock plans, net of related tax benefits, Shares				1.0
Issuance of common stock under employee stock plans, net of related tax benefits	3				3
Convertible debenture repurchases and conversions	(42)				(42)
Net income	1,523
Other Comprehensive Income (Loss), Net of Tax	(712)
Balance (in shares), Ending at Mar. 31, 2020				252.0
Total shareholders' equity, Ending Balance at Mar. 31, 2020				$ 3	9,338	23,360			(1,008)
Total equity, Ending Balance at Mar. 31, 2020	31,693
Balance (in shares), Beginning at Dec. 31, 2019				252.9
Total shareholders' equity, Beginning Balance at Dec. 31, 2019				$ 3	9,448	22,573	$ 22,538		(296)
Total shareholders' equity, Beginning Balance (Accounting Standards Update 2016-13) at Dec. 31, 2019								$ (35)
Total equity, Beginning Balance at Dec. 31, 2019	31,728	$ 31,693
Total equity, Beginning Balance (Accounting Standards Update 2016-13) at Dec. 31, 2019			$ (35)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' net income	3,799
Shareholders' other comprehensive income (loss)	42
Net income attributable to noncontrolling interests	0
Other comprehensive income attributable to noncontrolling interests	0
Repurchase and retirement of common stock	$ (584)
Repurchase and retirement of common stock, shares	(2.1)
Net income	$ 3,799
Other Comprehensive Income (Loss), Net of Tax	42
Balance (in shares), Ending at Jun. 30, 2020				252.1
Total shareholders' equity, Ending Balance at Jun. 30, 2020				$ 3	9,360	25,346			(254)
Total equity, Ending Balance at Jun. 30, 2020	34,455
Balance (in shares), Beginning at Mar. 31, 2020				252.0
Total shareholders' equity, Beginning Balance at Mar. 31, 2020				$ 3	9,338	23,360			(1,008)
Total equity, Beginning Balance at Mar. 31, 2020	31,693
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' net income	2,276					2,276
Shareholders' other comprehensive income (loss)	754								754
Net income attributable to noncontrolling interests	0
Other comprehensive income attributable to noncontrolling interests	0
Repurchase and retirement of common stock	(55)			$ 0	(9)	(46)
Repurchase and retirement of common stock, shares				(0.2)
Dividends and dividend equivalents	(244)					(244)
Issuance of common stock under employee stock plans, net of related tax benefits, Shares				0.3
Issuance of common stock under employee stock plans, net of related tax benefits	113				113
Convertible debenture repurchases and conversions	(82)				(82)
Net income	2,276
Other Comprehensive Income (Loss), Net of Tax	754
Balance (in shares), Ending at Jun. 30, 2020				252.1
Total shareholders' equity, Ending Balance at Jun. 30, 2020				$ 3	9,360	25,346			(254)
Total equity, Ending Balance at Jun. 30, 2020	34,455
Balance (in shares), Beginning at Dec. 31, 2020				245.4
Total shareholders' equity, Beginning Balance at Dec. 31, 2020	33,199			$ 3	9,244	23,802			150
Noncontrolling interests, Beginning Balance at Dec. 31, 2020	0									$ 0
Total equity, Beginning Balance at Dec. 31, 2020	33,199
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' net income						1,665
Shareholders' other comprehensive income (loss)									(345)
Net income attributable to noncontrolling interests										2
Other comprehensive income attributable to noncontrolling interests										(2)
Noncontrolling interests adjustment	65									65
Repurchase and retirement of common stock	(447)			$ (1)	(53)	(393)
Repurchase and retirement of common stock, shares				(1.4)
Dividends and dividend equivalents	(281)					(281)
Issuance of common stock under employee stock plans, net of related tax benefits, Shares				0.9
Issuance of common stock under employee stock plans, net of related tax benefits	62				62
Net income	1,667
Other Comprehensive Income (Loss), Net of Tax	(347)
Balance (in shares), Ending at Mar. 31, 2021				244.9
Total shareholders' equity, Ending Balance at Mar. 31, 2021				$ 2	9,253	24,793			(195)
Noncontrolling interests, Ending Balance at Mar. 31, 2021										65
Total equity, Ending Balance at Mar. 31, 2021	33,918
Balance (in shares), Beginning at Dec. 31, 2020				245.4
Total shareholders' equity, Beginning Balance at Dec. 31, 2020	33,199			$ 3	9,244	23,802			150
Noncontrolling interests, Beginning Balance at Dec. 31, 2020	0									0
Total equity, Beginning Balance at Dec. 31, 2020	33,199
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' net income	3,458
Shareholders' other comprehensive income (loss)	(167)
Net income attributable to noncontrolling interests	10
Other comprehensive income attributable to noncontrolling interests	0
Repurchase and retirement of common stock	$ (927)
Repurchase and retirement of common stock, shares	(2.7)
Net income	$ 3,468
Other Comprehensive Income (Loss), Net of Tax	(167)
Balance (in shares), Ending at Jun. 30, 2021				243.9
Total shareholders' equity, Ending Balance at Jun. 30, 2021	34,968			$ 2	9,109	25,874			(17)
Noncontrolling interests, Ending Balance at Jun. 30, 2021	78									78
Total equity, Ending Balance at Jun. 30, 2021	35,046
Balance (in shares), Beginning at Mar. 31, 2021				244.9
Total shareholders' equity, Beginning Balance at Mar. 31, 2021				$ 2	9,253	24,793			(195)
Noncontrolling interests, Beginning Balance at Mar. 31, 2021										65
Total equity, Beginning Balance at Mar. 31, 2021	33,918
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shareholders' net income	1,793					1,793
Shareholders' other comprehensive income (loss)	178								178
Net income attributable to noncontrolling interests	8									8
Other comprehensive income attributable to noncontrolling interests	2									2
Noncontrolling interests adjustment	3									3
Repurchase and retirement of common stock	(480)				(47)	(433)
Repurchase and retirement of common stock, shares				(1.3)
Dividends and dividend equivalents	(279)					(279)
Issuance of common stock under employee stock plans, net of related tax benefits, Shares				0.3
Issuance of common stock under employee stock plans, net of related tax benefits	119				119
Convertible debenture repurchases and conversions	(216)				(216)
Net income	1,801
Other Comprehensive Income (Loss), Net of Tax	180
Balance (in shares), Ending at Jun. 30, 2021				243.9
Total shareholders' equity, Ending Balance at Jun. 30, 2021	34,968			$ 2	$ 9,109	$ 25,874			$ (17)
Noncontrolling interests, Ending Balance at Jun. 30, 2021	78									$ 78
Total equity, Ending Balance at Jun. 30, 2021	$ 35,046