Investment Securities - Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Less than 12 months	$ 5,742	$ 4,936
12 months or longer	2,943	522
Total fair value	8,685	5,458
Unrealized Losses
Less than 12 months	(729)	(90)
12 months or longer	(645)	(22)
Total unrealized losses	(1,374)	(112)
Government agency issued MBS
Schedule of Investments [Line Items]
Less than 12 months	3,168	2,973
12 months or longer	1,517	184
Total fair value	4,685	3,157
Unrealized Losses
Less than 12 months	(429)	(41)
12 months or longer	(338)	(8)
Total unrealized losses	(767)	(49)
Government agency issued CMO
Schedule of Investments [Line Items]
Less than 12 months	1,398	1,436
12 months or longer	992	248
Total fair value	2,390	1,684
Unrealized Losses
Less than 12 months	(155)	(37)
12 months or longer	(205)	(10)
Total unrealized losses	(360)	(47)
Other U.S. government agencies
Schedule of Investments [Line Items]
Less than 12 months	669	459
12 months or longer	386	90
Total fair value	1,055	549
Unrealized Losses
Less than 12 months	(71)	(11)
12 months or longer	(85)	(4)
Total unrealized losses	(156)	(15)
States and municipalities
Schedule of Investments [Line Items]
Less than 12 months	507	68
12 months or longer	48	0
Total fair value	555	68
Unrealized Losses
Less than 12 months	(74)	(1)
12 months or longer	(17)	0
Total unrealized losses	$ (91)	$ (1)