Investment Securities - Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Less than 12 months	$ 1,327	$ 4,554
12 months or longer	7,186	4,037
Total fair value	8,513	8,591
Unrealized Losses
Less than 12 months	(47)	(487)
12 months or longer	(1,099)	(801)
Total unrealized losses	(1,146)	(1,288)
Government agency issued MBS
Schedule of Investments [Line Items]
Less than 12 months	700	2,314
12 months or longer	3,996	2,350
Total fair value	4,696	4,664
Unrealized Losses
Less than 12 months	(20)	(249)
12 months or longer	(602)	(446)
Total unrealized losses	(622)	(695)
Government agency issued CMO
Schedule of Investments [Line Items]
Less than 12 months	309	1,104
12 months or longer	2,006	1,209
Total fair value	2,315	2,313
Unrealized Losses
Less than 12 months	(15)	(123)
12 months or longer	(321)	(246)
Total unrealized losses	(336)	(369)
Other U.S. government agencies
Schedule of Investments [Line Items]
Less than 12 months	265	643
12 months or longer	733	424
Total fair value	998	1,067
Unrealized Losses
Less than 12 months	(10)	(67)
12 months or longer	(131)	(95)
Total unrealized losses	(141)	(162)
States and municipalities
Schedule of Investments [Line Items]
Less than 12 months	53	493
12 months or longer	451	54
Total fair value	504	547
Unrealized Losses
Less than 12 months	(2)	(48)
12 months or longer	(45)	(14)
Total unrealized losses	$ (47)	$ (62)