v3.26.1
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Basis Adjustments for Hedged Items) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]    
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged items $ 3  
Investment securities 10,383 $ 10,353
Amount of hedging 5,700  
Fair Value Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Investment securities 9,200  
Fair Value Hedging | Hedges of fixed-rate assets    
Derivative Instruments, Gain (Loss) [Line Items]    
Par value of hedged items 11,510 11,566
Carrying amount of hedged assets 11,296 11,383
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged items (214) (183)
Fair Value Hedging | Hedges of fixed-rate liabilities    
Derivative Instruments, Gain (Loss) [Line Items]    
Par value of hedged liabilities (1,500) (1,000)
Carrying amount of hedged liabilities (1,501) (1,009)
Cumulative amount of fair value hedging adjustment included in the carrying amount of the hedged items $ (1) $ (9)