VARIABLE INTEREST ENTITIES - Narrative (Details)	12 Months Ended
	Dec. 31, 2015 USD ($)
Variable Interest Entity [Line Items]
Net impairment losses recognized in earnings	$ 0
LIHTC Investments
Variable Interest Entity [Line Items]
Investment in low income housing tax credit partnerships	598,000,000
Qualified affordable housing project investments, commitment	365,000,000
Amortization method qualified affordable housing project investments, amortization	45,000,000
Affordable housing tax credits and other tax benefits, amount	45,000,000
Other tax expense (benefit)	$ (17,000,000)