v3.26.1
LOAN SERVICING - Schedule of Sensitivity of Fair Value to Changes in Key Assumptions (Details) - Mortgage Servicing Rights - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]    
Weighted average life (months) 91 months 89 months
Constant prepayment rate (annualized) 8.40% 8.60%
Discount rate 10.10% 10.10%
Sensitivity analysis of fair value, change in interest rates, plus 2.00% $ 11 $ 13
Sensitivity analysis of fair value, change in interest rates, plus 1.00% 9 10
Sensitivity analysis of fair value, change in interest rates, plus 0.50% 6 7
Sensitivity analysis of fair value, change in interest rates, plus 0.25% 4 4
Sensitivity analysis of fair value, change in interest rates, minus 0.25% (4) (4)
Sensitivity analysis of fair value, change in interest rates, minus 0.50% (9) (8)
Sensitivity analysis of fair value, change in interest rates, minus 1.00% (16) (14)
Sensitivity analysis of fair value, change in interest rates, minus 2.00% (26) (24)
Sensitivity analysis of fair value, change in interest rates, minus 3.00% $ (43) $ (42)