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, 2024	Dec. 31, 2023
Servicing Assets at Fair Value [Line Items]
Weighted average life (months)	96 months	92 months
Constant prepayment rate (annualized)	7.60%	7.90%
Discount rate	10.30%	10.20%
Sensitivity analysis of fair value, change in interest rates, plus 2.00%	$ 6	$ 7
Sensitivity analysis of fair value, change in interest rates, plus 1.00%	5	5
Sensitivity analysis of fair value, change in interest rates, plus .50%	3	3
Sensitivity analysis of fair value, change in interest rates, plus .25%	2	2
Sensitivity analysis of fair value, change in interest rates, minus .25%	(2)	(2)
Sensitivity analysis of fair value, change in interest rates, minus .50%	(5)	(4)
Sensitivity analysis of fair value, change in interest rates, minus 1.00%	(11)	(8)
Sensitivity analysis of fair value, change in interest rates, minus 2.00%	(20)	(21)
Sensitivity analysis of fair value, change in interest rates, minus 3.00%	$ (34)	$ (42)