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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

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