Other Comprehensive Income (Loss) (Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			$ 10,139
Current period change	$ (771)	$ (153)	(2,360)	$ (331)
Balance	7,649	9,979	7,649	9,979
URA(D) On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(1,288)	518	239	724
Current period change	(671)	(101)	(2,199)	(308)
Balance	(1,959)	416	(1,959)	416
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(240)	(91)	(177)	(115)
Current period change	(101)	(54)	(163)	(29)
Balance	(341)	(144)	(341)	(144)
Benefit Plan Net Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(49)	(70)	(50)	(74)
Current period change	1	2	2	6
Balance	(48)	(68)	(48)	(68)
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(1,577)	357	12	535
Current period change	(771)	(153)	(2,360)	(331)
Balance	$ (2,348)	$ 204	$ (2,348)	$ 204