VARIABLE INTEREST ENTITIES - Schedule of Affordable Housing Tax Credit Investments (Details) - LIHTC Investments - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Tax credits included in income tax expense	$ 202	$ 159	$ 128
Other tax benefits included in income tax expense	48	38	32
Tax credits included in income tax expense	250	197	160
Less: Amortization included in income tax expense	208	168	137
Net benefit from affordable housing tax credit investments included in income tax expense	$ 42	$ 29	$ 23