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LOAN SERVICING - Sensitivity of Fair Value to Changes in Key Assumptions (Detail) - Mortgage Servicing Rights - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Servicing Assets at Fair Value [Line Items]    
Weighted average life (months) 92 months 96 months
Constant prepayment rate (annualized) 7.90% 7.30%
Discount rate 10.20% 10.00%
Sensitivity analysis of fair value, change in interest rates, plus 2.00% $ 7 $ 9
Sensitivity analysis of fair value, change in interest rates, plus 1.00% 5 4
Sensitivity analysis of fair value, change in interest rates, plus .50% 3 2
Sensitivity analysis of fair value, change in interest rates, plus .25% 2 1
Sensitivity analysis of fair value, change in interest rates, minus .25% (2) (1)
Sensitivity analysis of fair value, change in interest rates, minus .50% (4) (3)
Sensitivity analysis of fair value, change in interest rates, minus 1.00% (8) (6)
Sensitivity analysis of fair value, change in interest rates, minus 2.00% (21) (15)
Sensitivity analysis of fair value, change in interest rates, minus 3.00% $ (42) $ (29)