Investment Securities (Gross Unrealized Loss and Fair Value of Securities Available for Sale Without an Allowance for Credit Losses) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	$ (109)	$ (5)
Unrealized loss position less than 12 months	16,133	644
Unrealized loss position 12 months or more	(2,390)	(2,364)
Unrealized loss position 12 months or more	19,194	22,091
Total	(2,499)	(2,369)
Total	35,327	22,735
U.S. Treasury and government agencies
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	(34)	(1)
Unrealized loss position less than 12 months	7,060	103
Unrealized loss position 12 months or more	(317)	(312)
Unrealized loss position 12 months or more	1,386	1,427
Total	(351)	(313)
Total	8,446	1,530
Residential mortgage-backed \| Mortgage-backed Securities Agency
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	(68)	(4)
Unrealized loss position less than 12 months	7,664	541
Unrealized loss position 12 months or more	(1,957)	(1,938)
Unrealized loss position 12 months or more	15,093	17,383
Total	(2,025)	(1,942)
Total	22,757	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	30	24
Total	(1)	(1)
Total	30	24
Commercial mortgage servicing rights \| Mortgage-backed Securities Agency
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	(2)	0
Unrealized loss position less than 12 months	407	0
Unrealized loss position 12 months or more	(73)	(66)
Unrealized loss position 12 months or more	1,515	1,572
Total	(75)	(66)
Total	1,922	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	(2)	(4)
Unrealized loss position 12 months or more	71	167
Total	(2)	(4)
Total	71	167
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	(3)	0
Unrealized loss position less than 12 months	829	0
Unrealized loss position 12 months or more	0	0
Unrealized loss position 12 months or more	0	0
Total	(3)	0
Total	829	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	173	0
Unrealized loss position 12 months or more	(40)	(43)
Unrealized loss position 12 months or more	1,099	1,518
Total	(42)	(43)
Total	$ 1,272	$ 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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