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BORROWINGS - Short-term Borrowings (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Securities sold under agreements to repurchase $ 450 $ 367
Securities sold under agreements to repurchase, interest rate 0.51% 0.59%
Asset Pledged as Collateral | Securities Assets    
Debt Instrument [Line Items]    
Securities sold under agreements to repurchase $ 526 $ 435