v3.26.3
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, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]        
Other Noninterest Income/(Expense) $ 36 $ 7 $ 70 $ 38
Customer-facing interest rate derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Other Noninterest Income/(Expense) 27 (2) 46 16
Customer commodity derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Other Noninterest Income/(Expense) 1 0 3 0
Other interest rate derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Other Noninterest Income/(Expense) 2 1 2 1
Foreign exchange derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Other Noninterest Income/(Expense) 6 8 19 22
Purchased credit derivatives        
Derivative Instruments, Gain (Loss) [Line Items]        
Other Noninterest Income/(Expense) $ 0 $ 0 $ 0 $ (1)