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, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	$ (50)	$ (147)
Unrealized loss position less than 12 months	14,034	24,489
Unrealized loss position 12 months or more	(2,973)	(3,534)
Unrealized loss position 12 months or more	31,554	25,149
Total	(3,023)	(3,681)
Total	45,588	49,638
U.S. Treasury and government agencies
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	(17)	(70)
Unrealized loss position less than 12 months	9,256	17,500
Unrealized loss position 12 months or more	(409)	(366)
Unrealized loss position 12 months or more	9,495	1,824
Total	(426)	(436)
Total	18,751	19,324
Residential mortgage-backed \| Mortgage-backed Securities Agency
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	(25)	(65)
Unrealized loss position less than 12 months	4,316	6,163
Unrealized loss position 12 months or more	(2,407)	(2,926)
Unrealized loss position 12 months or more	18,692	19,595
Total	(2,432)	(2,991)
Total	23,008	25,758
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	(2)	(3)
Unrealized loss position 12 months or more	32	41
Total	(2)	(3)
Total	32	41
Commercial mortgage servicing rights \| Mortgage-backed Securities Agency
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	(2)	(8)
Unrealized loss position less than 12 months	390	501
Unrealized loss position 12 months or more	(84)	(125)
Unrealized loss position 12 months or more	1,348	1,388
Total	(86)	(133)
Total	1,738	1,889
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	(7)	(15)
Unrealized loss position 12 months or more	415	559
Total	(7)	(15)
Total	415	559
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	0	(2)
Unrealized loss position less than 12 months	0	226
Unrealized loss position 12 months or more	0	(1)
Unrealized loss position 12 months or more	0	8
Total	0	(3)
Total	0	234
Other
Debt Securities, Available-for-sale [Line Items]
Unrealized loss position less than 12 months	(6)	(2)
Unrealized loss position less than 12 months	72	99
Unrealized loss position 12 months or more	(64)	(98)
Unrealized loss position 12 months or more	1,572	1,734
Total	(70)	(100)
Total	$ 1,644	$ 1,833

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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