Quarterly report [Sections 13 or 15(d)]

DERIVATIVE FINANCIAL INSTRUMENTS - Gain (Loss) (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Gain (Loss) (Details) - Derivatives not designated as Hedging Instruments - Fair Value Hedges - 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]        
Amount of Gain or (Loss) Recognized in Income on Derivative $ 8 $ (2) $ 44 $ 0
Interest rate contracts | Capital markets and advisory fees        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in Income on Derivative 13 6 21 11
Interest rate contracts | Mortgage banking income        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in Income on Derivative (21) (12) 0 (23)
Foreign exchange contracts | Capital markets and advisory fees        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in Income on Derivative 13 11 24 22
Credit contracts | Other noninterest income        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in Income on Derivative (2) (6) (4) (8)
Commodities contracts | Capital markets and advisory fees        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in Income on Derivative 1 1 2 2
Equity contracts | Other noninterest income and other noninterest expense        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in Income on Derivative $ 4 $ (2) $ 1 $ (4)