VARIABLE INTEREST ENTITIES - Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Variable Interest Entity [Line Items]
Assets	$ 41,681	$ 39,513	$ 38,406
Liabilities	36,245	34,363
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	154	150
Liabilities	114	107
Maximum Exposure to Loss	153	149
Trust Preferred Securities | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	1	1
Liabilities	72	67
Maximum Exposure to Loss	0	0
Affordable Housing Tax Credit Partnerships | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	123	121
Liabilities	37	34
Maximum Exposure to Loss	123	121
Other Investments | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	30	28
Liabilities	5	6
Maximum Exposure to Loss	$ 30	$ 28