SECURITIES - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Cumulative balance at end of period	$ 60	$ 56	$ 60	$ 56	$ 60	$ 56	$ 56	$ 55
Credit impairments recognized in earnings on debt securities that have been previously impaired	1	3	7	7
Reductions due to increases in cash flow expectations on impaired securities	1	3	3	6
Pretax non-credit related losses were deferred in OCI			35	54
Gain on sale of debt securities	$ 2	$ 25	$ 27	$ 119