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SECURITIES - Schedule of Balance Sheet Effect of Repurchase Agreement Offsetting (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]    
Securities sold under agreements to repurchase, gross $ (3,400)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross $ (2,600)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross
Securities sold under agreements to repurchase, offset 0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAmountOffsetAgainstCollateral 0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAmountOffsetAgainstCollateral
Securities sold under agreements to repurchase, net $ 3,400us-gaap_SecuritiesSoldUnderAgreementsToRepurchase $ 2,600us-gaap_SecuritiesSoldUnderAgreementsToRepurchase