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Derivative Instruments and Hedging Activities - Gains Losses on Freestanding Derivatives (Details) - Other non-interest income - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other non-interest income: | $ 265 | $ 324 | $ 141
Interest rate contracts: |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other non-interest income: | 69 | 89 | 103
Interest rate contracts: | Customer accommodation: |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other non-interest income: | 30 | 34 | 40
Interest rate contracts: | Other interest rate exposures |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other non-interest income: | 254 | 264 | 76
Commodity contracts | Customer accommodation: |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other non-interest income: | 18 | 39 | 49
Foreign exchange and other contracts | Customer accommodation: |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other non-interest income: | 21 | 16 | 14
Other contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (losses) recognized in other non-interest income: | $ (58) | $ (29) | $ (38)

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