VARIABLE INTEREST ENTITIES - Unconsolidated VIEs (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Variable Interest Entity [Line Items]
Total Assets	$ 285,372	$ 225,106
Total Liabilities	252,791	200,727
Variable Interest Entity
Variable Interest Entity [Line Items]
Total Assets	4,761	3,932
Total Liabilities	1,626	1,404
Maximum Exposure to Loss	4,747	3,918
Affordable housing tax credit partnerships | Variable Interest Entity
Variable Interest Entity [Line Items]
Total Assets	2,874	2,453
Total Liabilities	1,034	946
Maximum Exposure to Loss	2,874	2,453
Trust preferred securities | Variable Interest Entity
Variable Interest Entity [Line Items]
Total Assets	14	14
Total Liabilities	248	262
Maximum Exposure to Loss	0	0
Other investments | Variable Interest Entity
Variable Interest Entity [Line Items]
Total Assets	1,873	1,465
Total Liabilities	344	196
Maximum Exposure to Loss	$ 1,873	$ 1,465