Quarterly report pursuant to Section 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 Hedging - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in Income on Derivative $ (25) $ 147
Interest rate contracts | Capital markets fees    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in Income on Derivative 10 12
Interest rate contracts | Mortgage banking income    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in Income on Derivative (47) (6)
Interest rate floors | Interest and fee income on loans and leases    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in Income on Derivative 0 (2)
Interest rate caps | Interest expense on long-term debt    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in Income on Derivative 0 144
Foreign exchange contracts | Capital markets fees    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in Income on Derivative 10 6
Commodities contracts | Capital markets fees    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in Income on Derivative 1 0
Equity contracts | Other noninterest expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in Income on Derivative $ 1 $ (7)