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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
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | $ 101 | $ 79 | $ 175 | $ 145
Interest rate contracts: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | 20 | 25 | 37 | 44
Interest rate contracts: | Customer accommodation: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | 10 | 11 | 17 | 19
Interest rate contracts: | Other interest rate exposures |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | 90 | 66 | 158 | 118
Commodity contracts | Customer accommodation: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | 4 | 9 | 8 | 17
Foreign exchange and other contracts | Customer accommodation: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | 6 | 5 | 12 | 8
Other contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) recognized in other non-interest income: | $ (9) | $ (12) | $ (20) | $ (17)

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