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Derivative Instruments and Hedging Activities - Gains Losses on Freestanding Derivatives (Details) - Other non-interest income - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) recognized in other non-interest income: | $ 56 | $ 74
Interest rate contracts: |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) recognized in other non-interest income: | 17 | 17
Interest rate contracts: | Customer accommodation: |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) recognized in other non-interest income: | 6 | 7
Interest rate contracts: | Other interest rate exposures |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) recognized in other non-interest income: | 40 | 68
Commodity contracts | Customer accommodation: |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) recognized in other non-interest income: | 7 | 4
Foreign exchange and other contracts | Customer accommodation: |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) recognized in other non-interest income: | 4 | 6
Other contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gains (losses) recognized in other non-interest income: | $ (1) | $ (11)

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