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DERIVATIVE FINANCIAL INSTRUMENTS - MSR Hedging Activities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Remaining maturity 1 year   1 year    
Notional Value $ 42,311   $ 42,311   $ 45,809
Derivative used in Mortgage Banking Activities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, fair value, net 3   3   7
Notional Value 2,350   2,350   1,780
Trading liabilities 15   15   45
Trading gains (losses) 4 $ 26 13 $ (3)  
Commitments to sell loans          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Commitments to sell residential real estate loans $ 1,600   $ 1,600   $ 869