Investment Securities - Gross Unrealized Losses and Fair Values of Investments in Continuous Unrealized Loss Positions (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
AFS securities, Fair Value
Less than 12 months	$ 13,598	$ 22,396
12 months or more	29,396	29,690
Total	42,994	52,086
AFS securities, Unrealized Losses
Less than 12 months	(168)	(334)
12 months or more	(5,513)	(6,209)
Total	(5,681)	(6,543)
U.S. Treasury
AFS securities, Fair Value
Less than 12 months	2,420	1,579
12 months or more	244	352
Total	2,664	1,931
AFS securities, Unrealized Losses
Less than 12 months	(4)	(6)
12 months or more	(12)	(18)
Total	(16)	(24)
GSE
AFS securities, Fair Value
Less than 12 months	106	146
12 months or more	214	230
Total	320	376
AFS securities, Unrealized Losses
Less than 12 months	(1)	(4)
12 months or more	(27)	(35)
Total	(28)	(39)
Agency MBS – residential
AFS securities, Fair Value
Less than 12 months	10,845	20,546
12 months or more	26,761	26,788
Total	37,606	47,334
AFS securities, Unrealized Losses
Less than 12 months	(146)	(322)
12 months or more	(4,866)	(5,494)
Total	(5,012)	(5,816)
Debt Securities, Held-to-Maturity, Fair Value
Less than 12 months	0	0
12 months or more	40,438	40,286
Total	40,438	40,286
Debt Securities, Held-To-Maturity, Unrealized Losses
Less than 12 months	0	0
12 months or more	(9,438)	(10,354)
Total	(9,438)	(10,354)
Agency MBS – commercial
AFS securities, Fair Value
Less than 12 months	35	105
12 months or more	2,133	2,111
Total	2,168	2,216
AFS securities, Unrealized Losses
Less than 12 months	0	(1)
12 months or more	(604)	(644)
Total	(604)	(645)
States and political subdivisions
AFS securities, Fair Value
Less than 12 months	184	20
12 months or more	37	202
Total	221	222
AFS securities, Unrealized Losses
Less than 12 months	(17)	(1)
12 months or more	(3)	(18)
Total	(20)	(19)
Other
AFS securities, Fair Value
Less than 12 months	8	0
12 months or more	7	7
Total	15	7
AFS securities, Unrealized Losses
Less than 12 months	0	0
12 months or more	(1)	0
Total	$ (1)	$ 0

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