VARIABLE INTEREST ENTITIES - Narrative (Details) - LIHTC Investments - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Variable Interest Entity [Line Items]
Amortization method qualified affordable housing project investments, amortization	$ 15,000,000	$ 12,000,000
Affordable housing tax credits and other tax benefits, amount	15,000,000	11,000,000
Other tax expense (benefit)	(6,000,000)	(4,000,000)
Net impairment losses recognized in earnings	$ 0	$ 0