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INVESTMENTS (EQUITY-BASED AND TREASURY FUTURE CONTRACTS) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]    
Cash and securities collateral for derivative contract $ 1,484 $ 655
Collateralized derivative transactions 0 5
Cash and securities collateral 3 5
Exchange Traded Future Contract [Line Items]    
Securities purchased under agreements to resell 673 79
Securities sold under agreement to repurchase    
Exchange Traded Future Contract [Line Items]    
Securities Sold under Agreements to Repurchase, Gross 2,485 $ 1,890
S&P 500, Russell 1000, NASDAQ 100 and Emerging Market Indices    
Exchange Traded Future Contract [Line Items]    
Exchange-Traded Future Contract, Initial Margin Requirement 253  
Us Treasury Notes And Euro Dollar    
Exchange Traded Future Contract [Line Items]    
Exchange-Traded Future Contract, Initial Margin Requirement 32  
Euro Stoxx, FTSE100, EAFE And Topix Indices    
Exchange Traded Future Contract [Line Items]    
Exchange-Traded Future Contract, Initial Margin Requirement $ 46