Consolidated Statements Of Shareholders' Equity - USD ($) $ in Millions	Total	Common Shares	Common Shares in Treasury	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]	Cumulative Translation Adjustment	Accumulated Defined Benefit Plans Adjustment [Member]	Accumulated Other Comprehensive Income
Balance – beginning of year, net of tax at Dec. 31, 2019		$ 11,121	$ (3,754)	$ 11,203	$ 36,142	$ (72)	$ 36,070	$ 2,543	$ (1,939)	$ 15	$ 619
Treasury Stock, Retired, Cost Method, Amount		(57)	323		(266)
Common Shares repurchased			(516)
Net shares issued under employee share-based compensation plans			303	(195)
Stock Issued During Period, Value, Stock Options Exercised				(50)
Share-based compensation expense				255
FundingDividendsDeclaredToRetainedEarnings				(1,398)
Net income	$ 3,533				3,533
Funding Dividends Declared From Additional Paid In Capital					1,398
Dividends declared on Common Shares					(1,398)
Other Comprehensive Income (Loss), Net of Tax	2,250										2,250
Balance – end of year, net of tax at Dec. 31, 2020	59,441	11,064	(3,644)	9,815	39,337	0	39,337	4,673	(1,637)	(167)	2,869
Treasury Stock, Retired, Cost Method, Amount		(79)	590		(511)
Common Shares repurchased			(4,861)
Net shares issued under employee share-based compensation plans			451	(179)
Stock Issued During Period, Value, Stock Options Exercised				(52)
Share-based compensation expense				286
FundingDividendsDeclaredToRetainedEarnings				(1,392)
Net income	8,539				8,539
Funding Dividends Declared From Additional Paid In Capital					1,392
Dividends declared on Common Shares					(1,392)
Other Comprehensive Income (Loss), Net of Tax	(2,519)										(2,519)
Balance – end of year, net of tax at Dec. 31, 2021	59,714	10,985	(7,464)	8,478	47,365	$ 0	$ 47,365	2,256	(2,146)	240	350
Treasury Stock, Retired, Cost Method, Amount		(639)	4,983		(4,344)
Common Shares repurchased			(3,014)
Net shares issued under employee share-based compensation plans			382	(173)
Stock Issued During Period, Value, Stock Options Exercised				(43)
Share-based compensation expense				283
FundingDividendsDeclaredToRetainedEarnings				(1,379)
Net income	5,313				5,313
Funding Dividends Declared From Additional Paid In Capital					1,379
Dividends declared on Common Shares					(1,379)
Other Comprehensive Income (Loss), Net of Tax	(10,543)										(10,543)
Balance – end of year, net of tax at Dec. 31, 2022	$ 50,540	$ 10,346	$ (5,113)	$ 7,166	$ 48,334			$ (7,279)	$ (3,073)	$ 225	$ (10,193)