Investment Securities - Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Less than 12 months	$ 6,756	$ 4,936
12 months or longer	1,816	522
Total fair value	8,572	5,458
Unrealized Losses
Less than 12 months	(601)	(90)
12 months or longer	(290)	(22)
Total unrealized losses	(891)	(112)
Government agency issued MBS
Schedule of Investments [Line Items]
Less than 12 months	3,887	2,973
12 months or longer	787	184
Total fair value	4,674	3,157
Unrealized Losses
Less than 12 months	(362)	(41)
12 months or longer	(129)	(8)
Total unrealized losses	(491)	(49)
Government agency issued CMO
Schedule of Investments [Line Items]
Less than 12 months	1,695	1,436
12 months or longer	819	248
Total fair value	2,514	1,684
Unrealized Losses
Less than 12 months	(115)	(37)
12 months or longer	(126)	(10)
Total unrealized losses	(241)	(47)
Other U.S. government agencies
Schedule of Investments [Line Items]
Less than 12 months	664	459
12 months or longer	203	90
Total fair value	867	549
Unrealized Losses
Less than 12 months	(65)	(11)
12 months or longer	(33)	(4)
Total unrealized losses	(98)	(15)
States and municipalities
Schedule of Investments [Line Items]
Less than 12 months	510	68
12 months or longer	7	0
Total fair value	517	68
Unrealized Losses
Less than 12 months	(59)	(1)
12 months or longer	(2)	0
Total unrealized losses	$ (61)	$ (1)