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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, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months | $ (58) | $ (8)
Unrealized loss position less than 12 months | 14,530 | 1,108
Unrealized loss position 12 months or more | (3,827) | (3,792)
Unrealized loss position 12 months or more | 28,875 | 34,766
Total | (3,885) | (3,800)
Total | 43,405 | 35,874
U.S. Treasury and government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months | (30) |
Unrealized loss position less than 12 months | 10,966 |
Unrealized loss position 12 months or more | (383) | (666)
Unrealized loss position 12 months or more | 2,960 | 6,035
Total | (413) | (666)
Total | 13,926 | 6,035
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months | (3) |
Unrealized loss position less than 12 months | 694 |
Unrealized loss position 12 months or more | (1) | (1)
Unrealized loss position 12 months or more | 93 | 9
Total | (4) | (1)
Total | 787 | 9
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months | (1) | (3)
Unrealized loss position less than 12 months | 105 | 78
Unrealized loss position 12 months or more | (139) | (136)
Unrealized loss position 12 months or more | 1,932 | 2,106
Total | (140) | (139)
Total | 2,037 | 2,184
Mortgage-backed Securities Agency | Residential mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months | (22) | (4)
Unrealized loss position less than 12 months | 2,576 | 1,015
Unrealized loss position 12 months or more | (3,131) | (2,805)
Unrealized loss position 12 months or more | 21,752 | 24,306
Total | (3,153) | (2,809)
Total | 24,328 | 25,321
Mortgage-backed Securities Agency | Commercial mortgage servicing rights |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position less than 12 months | (2) |
Unrealized loss position less than 12 months | 189 |
Unrealized loss position 12 months or more | (139) | (135)
Unrealized loss position 12 months or more | 1,397 | 1,495
Total | (141) | (135)
Total | 1,586 | 1,495
Mortgage-backed Securities Non-agency | Residential mortgage-backed |  |
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 | (6) | (4)
Unrealized loss position 12 months or more | 87 | 84
Total | (6) | (5)
Total | 87 | 99
Mortgage-backed Securities Non-agency | Commercial mortgage servicing rights |  |
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 | (28) | (45)
Unrealized loss position 12 months or more | 654 | 731
Total | (28) | (45)
Total | $ 654 | $ 731

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