VARIABLE INTEREST ENTITIES - Schedule of Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Variable Interest Entity [Line Items]
Total Assets	$ 49,889	$ 48,625	$ 47,976
Total Liabilities	43,253	42,323
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	205	201
Total Liabilities	133	141
Maximum Exposure to Loss	202	198
Variable Interest Entity, Primary Beneficiary | Trust preferred securities
Variable Interest Entity [Line Items]
Total Assets	3	3
Total Liabilities	74	73
Maximum Exposure to Loss	0	0
Variable Interest Entity, Primary Beneficiary | Tax credit partnerships
Variable Interest Entity [Line Items]
Total Assets	165	164
Total Liabilities	59	68
Maximum Exposure to Loss	165	164
Variable Interest Entity, Primary Beneficiary | Other investments
Variable Interest Entity [Line Items]
Total Assets	37	34
Total Liabilities	0	0
Maximum Exposure to Loss	$ 37	$ 34