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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)