VARIABLE INTEREST ENTITIES - Schedule of Affordable Housing Tax Credit Investments (Details) - LIHTC Investments - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Variable Interest Entity
Tax credits included in income tax expense	$ 39	$ 34	$ 80	$ 69
Amortization expense included in income tax expense	42	35	85	72
Other tax benefits included in income tax expense	$ 10	$ 8	$ 20	$ 16