Consolidated Statements Of Shareholders' Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock [Member]	Treasury Stock, Common	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance – beginning of period, net of tax at Dec. 31, 2021		$ 10,985	$ (7,464)	$ 8,478	$ 47,403	$ (1,074)
Common Shares repurchased			(1,001)
Treasury Stock, Retired, Cost Method, Amount		(319)	2,510		(2,191)
Net shares issued under employee share-based compensation plans			255	(199)
Exercise of stock options				(21)
Share-based compensation expense				70
Funding of dividends declared to Retained earnings				(340)
Net income (loss)	$ 1,953				1,953
Funding of dividends declared from Additional paid-in capital					340
Dividends declared on Common Shares					(340)
Other Comprehensive Income (Loss), Net of Tax	(3,329)					(3,329)
Balance – end of period, net of tax at Mar. 31, 2022	55,716	10,666	(5,700)	7,988	47,165	(4,403)
Balance – beginning of period, net of tax at Dec. 31, 2022	50,519	10,346	(5,113)	7,166	48,305	(10,185)
Common Shares repurchased			(428)
Treasury Stock, Retired, Cost Method, Amount		0	0		0
Net shares issued under employee share-based compensation plans			200	(211)
Exercise of stock options				(13)
Share-based compensation expense				82
Funding of dividends declared to Retained earnings				(344)
Net income (loss)	1,892				1,892
Funding of dividends declared from Additional paid-in capital					344
Dividends declared on Common Shares					(344)
Other Comprehensive Income (Loss), Net of Tax	1,290					1,290
Balance – end of period, net of tax at Mar. 31, 2023	$ 52,987	$ 10,346	$ (5,341)	$ 6,680	$ 50,197	$ (8,895)