VARIABLE INTEREST ENTITIES - Schedule of Affordable Housing Tax Credit Investments (Details) - LIHTC Investments - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Variable Interest Entity
Tax credits included in income tax expense	$ 17	$ 12	$ 46	$ 35
Amortization expense included in income tax expense	14	11	45	35
Other tax benefits included in income tax expense	$ 2	$ 4	$ 15	$ 13