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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 | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | $ 28 | $ 97 | $ 203 | $ 242
Interest rate contracts: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | 11 | 23 | 48 | 67
Interest rate contracts: | Customer accommodation: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | 3 | 7 | 20 | 26
Interest rate contracts: | Other interest rate exposures |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | 48 | 81 | 206 | 199
Commodity contracts | Customer accommodation: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | 5 | 11 | 13 | 28
Foreign exchange and other contracts | Customer accommodation: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | 3 | 5 | 15 | 13
Other contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | $ (31) | $ (7) | $ (51) | $ (24)

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