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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]        
Other Noninterest Income/(Expense) $ 17 $ 18 $ 34 $ 30
Customer-facing interest rate derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Other Noninterest Income/(Expense) 11 11 20 18
Customer commodity derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Other Noninterest Income/(Expense) 1 0 2 0
Other interest rate derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Other Noninterest Income/(Expense) (1) 0 0 (1)
Foreign exchange derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Other Noninterest Income/(Expense) 6 8 12 14
Purchased credit derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Other Noninterest Income/(Expense) $ 0 $ (1) $ 0 $ (1)