VARIABLE INTEREST ENTITIES - Schedule of Affordable Housing Tax Credit Investments (Details) - LIHTC Investments - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Variable Interest Entity
Tax credits included in income tax expense	$ 51	$ 39	$ 102	$ 80
Other tax benefits included in income tax expense	13	10	25	20
Total tax benefits included in income tax expense	64	49	127	100
Less: Amortization included in income tax expense	53	42	106	85
Net benefits from affordable housing tax credit investments included in income tax expense	$ 11	$ 7	$ 21	$ 15