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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Basis Adjustments for Hedged Items) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]    
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged items $ 35  
Investment securities 10,379 $ 10,601
Amount of hedging 5,600  
Fair Value Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Investment securities 9,500  
Fair Value Hedging | Hedges of fixed-rate assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Par value of hedged items 11,494 11,388
Carrying amount of hedged assets 11,333 11,099
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged items (161) (289)
Fair Value Hedging | Hedges of fixed-rate liabilities    
Derivative Instruments, Gain (Loss) [Line Items]    
Par value of hedged liabilities (1,000) (500)
Carrying amount of hedged liabilities (1,012) (493)
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged items $ (12) $ 7