v3.26.1
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Derivatives Not Designated as Hedges) (Details) - Derivatives not designated as hedging instruments - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]    
Other Noninterest Income/(Expense) $ 17 $ 13
Customer-facing interest rate derivatives    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Noninterest Income/(Expense) 8 7
Customer commodity derivatives    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Noninterest Income/(Expense) 1 0
Other interest rate derivatives    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Noninterest Income/(Expense) 1 0
Foreign exchange derivatives    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Noninterest Income/(Expense) 7 6
Purchased credit derivatives    
Derivative Instruments, Gain (Loss) [Line Items]    
Other Noninterest Income/(Expense) $ 0 $ 0