Investment Securities - Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Unrealized Losses
Fair value, less than 12 months	$ 300	$ 4,554
Unrealized losses, less than 12 months	(4)	(487)
Fair value, 12 months or longer	7,699	4,037
Unrealized loss, 12 months or longer	(1,108)	(801)
Fair value, total	7,999	8,591
Unrealized losses, total	(1,112)	(1,288)
Government agency issued MBS
Unrealized Losses
Fair value, less than 12 months	140	2,314
Unrealized losses, less than 12 months	(2)	(249)
Fair value, 12 months or longer	4,231	2,350
Unrealized loss, 12 months or longer	(577)	(446)
Fair value, total	4,371	4,664
Unrealized losses, total	(579)	(695)
Government agency issued CMO
Unrealized Losses
Fair value, less than 12 months	32	1,104
Unrealized losses, less than 12 months	0	(123)
Fair value, 12 months or longer	2,098	1,209
Unrealized loss, 12 months or longer	(341)	(246)
Fair value, total	2,130	2,313
Unrealized losses, total	(341)	(369)
Other U.S. government agencies
Unrealized Losses
Fair value, less than 12 months	114	643
Unrealized losses, less than 12 months	(2)	(67)
Fair value, 12 months or longer	905	424
Unrealized loss, 12 months or longer	(149)	(95)
Fair value, total	1,019	1,067
Unrealized losses, total	(151)	(162)
States and municipalities
Unrealized Losses
Fair value, less than 12 months	14	493
Unrealized losses, less than 12 months	0	(48)
Fair value, 12 months or longer	465	54
Unrealized loss, 12 months or longer	(41)	(14)
Fair value, total	479	547
Unrealized losses, total	$ (41)	$ (62)