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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 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months | $ (147) | $ (8)
Unrealized loss position less than 12 months | 24,489 | 1,108
Unrealized loss position 12 months or more | (3,534) | (3,792)
Unrealized loss position 12 months or more | 25,149 | 34,766
Total | (3,681) | (3,800)
Total | 49,638 | 35,874
U.S. Treasury and government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months | (70) |
Unrealized loss position less than 12 months | 17,500 |
Unrealized loss position 12 months or more | (366) | (666)
Unrealized loss position 12 months or more | 1,824 | 6,035
Total | (436) | (666)
Total | 19,324 | 6,035
Residential mortgage-backed Securities | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months | (65) | (4)
Unrealized loss position less than 12 months | 6,163 | 1,015
Unrealized loss position 12 months or more | (2,926) | (2,805)
Unrealized loss position 12 months or more | 19,595 | 24,306
Total | (2,991) | (2,809)
Total | 25,758 | 25,321
Residential mortgage-backed Securities | 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 | 41 | 84
Total | (3) | (5)
Total | 41 | 99
Commercial Mortgage-Backed Securities | Mortgage-backed Securities Agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months | (8) |
Unrealized loss position less than 12 months | 501 |
Unrealized loss position 12 months or more | (125) | (135)
Unrealized loss position 12 months or more | 1,388 | 1,495
Total | (133) | (135)
Total | 1,889 | 1,495
Commercial Mortgage-Backed Securities | 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 | (15) | (45)
Unrealized loss position 12 months or more | 559 | 731
Total | (15) | (45)
Total | 559 | 731
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months | (2) |
Unrealized loss position less than 12 months | 226 |
Unrealized loss position 12 months or more | (1) | (1)
Unrealized loss position 12 months or more | 8 | 9
Total | (3) | (1)
Total | 234 | 9
Other debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months | (2) | (3)
Unrealized loss position less than 12 months | 99 | 78
Unrealized loss position 12 months or more | (98) | (136)
Unrealized loss position 12 months or more | 1,734 | 2,106
Total | (100) | (139)
Total | $ 1,833 | $ 2,184

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