SECURITIES - Schedule of Cumulative Credit Losses Recognized in Earnings (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
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Cumulative balance at beginning of period	$ 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)
Cumulative balance at end of period	$ 60	$ 56	$ 60	$ 56