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DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Derivative Instruments Fair Value Hedges (Details) - Qualifying Hedges - Interest rate contracts - Fair Value Hedges - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Net gain (loss) on fair value hedges $ 3 $ (2) $ (1)
Deposits      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Recognized on hedged item 1 (1) 0
Borrowings      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Recognized on derivatives 0 (4) 4
Recognized on hedged item $ 2 $ 3 $ (5)