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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) recognized in other non-interest income: $ 33 $ 28 $ 143 $ 203
Interest rate contracts:        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) recognized in other non-interest income: 29 11 70 48
Interest rate contracts: | Customer accommodation:        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) recognized in other non-interest income: 9 3 29 20
Interest rate contracts: | Other interest rate exposures        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) recognized in other non-interest income: 23 48 102 206
Commodity contracts | Customer accommodation:        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) recognized in other non-interest income: 9 5 21 13
Foreign exchange and other contracts | Customer accommodation:        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) recognized in other non-interest income: 11 3 20 15
Other contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) recognized in other non-interest income: $ (19) $ (31) $ (29) $ (51)