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LOAN SERVICING - Schedule of Sensitivity of Fair Value to Changes in Key Assumptions (Details) - Mortgage Servicing Rights - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Servicing Assets at Fair Value [Line Items]    
Weighted average life (months) 89 months 96 months
Constant prepayment rate (annualized) 8.60% 7.60%
Discount rate 10.10% 10.30%
Sensitivity analysis of fair value, change in interest rates, plus 2.00% $ 13 $ 6
Sensitivity analysis of fair value, change in interest rates, plus 1.00% 10 5
Sensitivity analysis of fair value, change in interest rates, plus .50% 7 3
Sensitivity analysis of fair value, change in interest rates, plus .25% 4 2
Sensitivity analysis of fair value, change in interest rates, minus .25% (4) (2)
Sensitivity analysis of fair value, change in interest rates, minus .50% (8) (5)
Sensitivity analysis of fair value, change in interest rates, minus 1.00% (14) (11)
Sensitivity analysis of fair value, change in interest rates, minus 2.00% (24) (20)
Sensitivity analysis of fair value, change in interest rates, minus 3.00% $ (42) $ (34)