VARIABLE INTEREST ENTITIES - Schedule of Affordable Housing Tax Credit Investments (Details) - LIHTC Investments - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Variable Interest Entity
Tax credits included in income tax expense	$ 30	$ 28	$ 99	$ 79
Amortization expense included in income tax expense	33	31	105	86
Other tax benefits included in income tax expense	$ 8	$ 7	$ 24	$ 19