VARIABLE INTEREST ENTITIES - Schedule of Affordable Housing Tax Credit Investments (Details) - LIHTC Investments - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Variable Interest Entity
Tax credits included in income tax expense	$ 21	$ 15
Amortization expense included in income tax expense	23	15
Other tax benefits included in income tax expense	$ 7	$ 6