Consolidated Statements Of Shareholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]
Adjusted beginning balance	$ 28,567		$ 9,536	$ 20,014	$ (986)
Balance at Dec. 31, 2018	28,541	$ 3	9,536	19,988	(986)
Balance (in shares) at Dec. 31, 2018		257.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,551			1,551
Other comprehensive income (loss)	363				363
Repurchase and retirement of common stock, value	$ (294)		(71)	(223)
Repurchase and retirement of common stock, shares	(1.1)	(1.1)
Dividends and dividend equivalents	$ (206)			(206)
Issuance of common stock under employee stock plans, net of related tax benefits, Shares		1.1
Issuance of common stock under employee stock plans, net of related tax benefits	69		69
Convertible debenture repurchases and conversions	(52)		(52)
Balance at Mar. 31, 2019	29,998	$ 3	9,482	21,136	(623)
Balance (in shares) at Mar. 31, 2019		257.4
Cumulative effect of new accounting principle in period of adoption	26			26
Adjusted beginning balance	31,693		9,448	22,538	(296)
Balance at Dec. 31, 2019	31,728	$ 3	9,448	22,573	(296)
Balance (in shares) at Dec. 31, 2019		252.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,523			1,523
Other comprehensive income (loss)	(712)				(712)
Repurchase and retirement of common stock, value	$ (529)		(71)	(458)
Repurchase and retirement of common stock, shares	(1.9)	(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)
Balance at Mar. 31, 2020	31,693	$ 3	$ 9,338	23,360	$ (1,008)
Balance (in shares) at Mar. 31, 2020		252.0
Cumulative effect of new accounting principle in period of adoption	$ (35)			$ (35)