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INVESTMENTS (DERIVATIVES GROSS COLLATERAL AMOUNTS LIABILITES) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Offsetting Liabilities [Line Items]    
Repurchase agreements, net amount presented on the balance sheet $ 1,837 $ 1,996
Securities sold under agreement to repurchase    
Offsetting Liabilities [Line Items]    
Repurchase agreements, net amount presented on the balance sheet   1,992
Repurchase agreements, collateral securities held   (1,986)
Repurchase agreements, collateral cash held   (2)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral $ (64) $ 4