Investment Securities (Gross Unrealized Loss and Fair Value of Securities Available for Sale Without an Allowance for Credit Losses) (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	$ (62)	$ (5)
Unrealized loss position less than 12 months	17,227	644
Unrealized loss position 12 months or more	(2,460)	(2,364)
Unrealized loss position 12 months or more	21,268	22,091
Total	(2,522)	(2,369)
Total	38,495	22,735
U.S. Treasury and government agencies
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	(26)	(1)
Unrealized loss position less than 12 months	11,216	103
Unrealized loss position 12 months or more	(330)	(312)
Unrealized loss position 12 months or more	1,390	1,427
Total	(356)	(313)
Total	12,606	1,530
Residential mortgage-backed \| Mortgage-backed Securities Agency
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	(32)	(4)
Unrealized loss position less than 12 months	5,494	541
Unrealized loss position 12 months or more	(2,011)	(1,938)
Unrealized loss position 12 months or more	16,745	17,383
Total	(2,043)	(1,942)
Total	22,239	17,924
Residential mortgage-backed \| Mortgage-backed Securities Non-agency
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	0	0
Unrealized loss position less than 12 months	0	0
Unrealized loss position 12 months or more	(1)	(1)
Unrealized loss position 12 months or more	31	24
Total	(1)	(1)
Total	31	24
Commercial mortgage servicing rights \| Mortgage-backed Securities Agency
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	(1)	0
Unrealized loss position less than 12 months	83	0
Unrealized loss position 12 months or more	(68)	(66)
Unrealized loss position 12 months or more	1,543	1,572
Total	(69)	(66)
Total	1,626	1,572
Commercial mortgage servicing rights \| Mortgage-backed Securities Non-agency
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	0	0
Unrealized loss position less than 12 months	0	0
Unrealized loss position 12 months or more	(3)	(4)
Unrealized loss position 12 months or more	140	167
Total	(3)	(4)
Total	140	167
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	(1)	0
Unrealized loss position less than 12 months	183	0
Unrealized loss position 12 months or more	0	0
Unrealized loss position 12 months or more	0	0
Total	(1)	0
Total	183	0
Other
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	(2)	0
Unrealized loss position less than 12 months	251	0
Unrealized loss position 12 months or more	(47)	(43)
Unrealized loss position 12 months or more	1,419	1,518
Total	(49)	(43)
Total	$ 1,670	$ 1,518

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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