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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Derivative Gain (Loss) Recognized/Reclassified) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) reclassified from AOCI into income $ (11) $ (23) $ (45) $ (71)
Loss to be reclassified within the next 12 months into interest income     37  
Deferred losses 48   48  
Derivatives designated as accounting hedges:        
Derivative Instruments, Gain (Loss) [Line Items]        
Effective portion of derivative gain (loss) deferred in AOCI 0 3 8 1
Amount of gain (loss) reclassified from AOCI into income (15) (28) (52) (93)
Interest on fair value hedges 12 22 34 65
Derivatives designated as accounting hedges: | Cash Flow Hedging        
Derivative Instruments, Gain (Loss) [Line Items]        
Terminated or redesignated, unamortized basis adjustments, debt 34 41 34 41
Terminated or redesignated, unamortized basis adjustments, assets 3 3 3 3
Derivatives designated as accounting hedges: | Cash Flow Hedging | Hedges of floating-rate assets        
Derivative Instruments, Gain (Loss) [Line Items]        
Effective portion of derivative gain (loss) deferred in AOCI 0 5 8 (2)
Amount of gain (loss) reclassified from AOCI into income (15) (30) (53) (99)
Interest on fair value hedges 0 0 0 0
Derivatives designated as accounting hedges: | Cash Flow Hedging | Hedges of floating-rate liabilities        
Derivative Instruments, Gain (Loss) [Line Items]        
Effective portion of derivative gain (loss) deferred in AOCI 0 (2) 0 3
Amount of gain (loss) reclassified from AOCI into income 0 2 1 6
Interest on fair value hedges 0 0 0 0
Derivatives designated as accounting hedges: | Fair Value Hedging | Hedges of fixed-rate assets        
Derivative Instruments, Gain (Loss) [Line Items]        
Effective portion of derivative gain (loss) deferred in AOCI 0 0 0 0
Amount of gain (loss) reclassified from AOCI into income 0 0 0 0
Interest on fair value hedges 15 24 (8) (5)
Derivatives designated as accounting hedges: | Fair Value Hedging | Hedges of fixed-rate liabilities        
Derivative Instruments, Gain (Loss) [Line Items]        
Effective portion of derivative gain (loss) deferred in AOCI 0 0 0 0
Amount of gain (loss) reclassified from AOCI into income 0 0 0 0
Interest on fair value hedges $ (3) $ (2) $ 42 $ 70