VARIABLE INTEREST ENTITIES - Schedule of Affordable Housing Tax Credit Investments (Details) - LIHTC Investments - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Variable Interest Entity
Tax credits included in income tax expense	$ 41	$ 35
Amortization expense included in income tax expense	43	37
Other tax benefits included in income tax expense	$ 10	$ 8