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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | $ 54 | $ 101 | $ 110 | $ 175
Interest rate contracts: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | 24 | 20 | 41 | 37
Interest rate contracts: | Customer accommodation: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | 14 | 10 | 20 | 17
Interest rate contracts: | Other interest rate exposures |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | 39 | 90 | 79 | 158
Commodity contracts | Customer accommodation: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | 5 | 4 | 12 | 8
Foreign exchange and other contracts | Customer accommodation: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | 5 | 6 | 9 | 12
Other contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | $ (9) | $ (9) | $ (10) | $ (20)

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