VARIABLE INTEREST ENTITIES - Unconsolidated VIEs (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Variable Interest Entity [Line Items]
Total Assets	$ 210,228	$ 204,230
Total Liabilities	187,942	184,448
Variable Interest Entity
Variable Interest Entity [Line Items]
Total Assets	3,850	3,597
Total Liabilities	1,445	1,481
Maximum Exposure to Loss	3,836	3,583
Affordable housing tax credit partnerships | Variable Interest Entity
Variable Interest Entity [Line Items]
Total Assets	2,469	2,382
Total Liabilities	1,017	1,065
Maximum Exposure to Loss	2,469	2,382
Trust preferred securities | Variable Interest Entity
Variable Interest Entity [Line Items]
Total Assets	14	14
Total Liabilities	248	248
Maximum Exposure to Loss	0	0
Other investments | Variable Interest Entity
Variable Interest Entity [Line Items]
Total Assets	1,367	1,201
Total Liabilities	180	168
Maximum Exposure to Loss	$ 1,367	$ 1,201