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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Derivatives Not Designated as Hedges) (Details) - Derivatives not designated as hedging instruments - 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]        
Other Noninterest Income/(Expense) $ 7 $ 10 $ 38 $ 38
Customer-facing interest rate derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Other Noninterest Income/(Expense) (2) 4 16 17
Other interest rate derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Other Noninterest Income/(Expense) 1 (2) 1 (1)
Foreign exchange derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Other Noninterest Income/(Expense) 8 8 22 22
Purchased credit derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Other Noninterest Income/(Expense) $ 0 $ 0 $ (1) $ 0