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SECURITIES - Schedule of Balance Sheet Effect of Repurchase Agreement Offsetting (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]    
Securities sold under agreements to repurchase, gross $ (3,050) $ (2,600)
Securities sold under agreements to repurchase, offset 0 0
Securities sold under agreements to repurchase, net $ 3,050 $ 2,600