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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 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months | $ (39) | $ (8)
Unrealized loss position less than 12 months | 12,348 | 1,108
Unrealized loss position 12 months or more | (2,709) | (3,792)
Unrealized loss position 12 months or more | 26,908 | 34,766
Total | (2,748) | (3,800)
Total | 39,256 | 35,874
U.S. Treasury and government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months | (37) |
Unrealized loss position less than 12 months | 11,531 |
Unrealized loss position 12 months or more | (385) | (666)
Unrealized loss position 12 months or more | 1,962 | 6,035
Total | (422) | (666)
Total | 13,493 | 6,035
Residential mortgage-backed | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months | (1) | (4)
Unrealized loss position less than 12 months | 577 | 1,015
Unrealized loss position 12 months or more | (2,130) | (2,805)
Unrealized loss position 12 months or more | 21,064 | 24,306
Total | (2,131) | (2,809)
Total | 21,641 | 25,321
Residential mortgage-backed | Mortgage-backed Securities Non-agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months |  | (1)
Unrealized loss position less than 12 months |  | 15
Unrealized loss position 12 months or more | (3) | (4)
Unrealized loss position 12 months or more | 52 | 84
Total | (3) | (5)
Total | 52 | 99
Commercial mortgage servicing rights | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months | (1) |
Unrealized loss position less than 12 months | 240 |
Unrealized loss position 12 months or more | (92) | (135)
Unrealized loss position 12 months or more | 1,432 | 1,495
Total | (93) | (135)
Total | 1,672 | 1,495
Commercial mortgage servicing rights | Mortgage-backed Securities Non-agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months |  |
Unrealized loss position less than 12 months |  |
Unrealized loss position 12 months or more | (18) | (45)
Unrealized loss position 12 months or more | 600 | 731
Total | (18) | (45)
Total | 600 | 731
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months |  |
Unrealized loss position less than 12 months |  |
Unrealized loss position 12 months or more | (1) | (1)
Unrealized loss position 12 months or more | 8 | 9
Total | (1) | (1)
Total | 8 | 9
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months |  | (3)
Unrealized loss position less than 12 months |  | 78
Unrealized loss position 12 months or more | (80) | (136)
Unrealized loss position 12 months or more | 1,790 | 2,106
Total | (80) | (139)
Total | $ 1,790 | $ 2,184

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