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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
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)