VARIABLE INTEREST ENTITIES - Schedule of Affordable Housing Tax Credit Investments (Details) - LIHTC Investments - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Variable Interest Entity
Tax credits included in income tax expense	$ 40	$ 30	$ 120	$ 99
Amortization expense included in income tax expense	42	33	127	105
Other tax benefits included in income tax expense	$ 10	$ 8	$ 30	$ 24