SECURITIES - Schedule of Balance Sheet Effect of Repurchase Agreement Offsetting (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Gross Assets (Liabilities)
Schedule of Repurchase Agreements [Line Items]
Securities purchased under agreements to resell	$ 0	$ 0
Securities sold under agreements to repurchase	(4,100)	(3,000)
Gross Assets (Liabilities) Offset
Schedule of Repurchase Agreements [Line Items]
Securities purchased under agreements to resell	0	0
Securities sold under agreements to repurchase	0	0
Net Amounts of Assets (Liabilities)
Schedule of Repurchase Agreements [Line Items]
Securities purchased under agreements to resell	0	0
Securities sold under agreements to repurchase	$ (4,100)	$ (3,000)