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INVESTMENTS (EQUITY-BASED AND TREASURY FUTURE CONTRACTS) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Cash and securities collateral for derivative contract $ 1,473 $ 755
Collateralized derivative transactions 1 700
Cash and securities collateral 2 820
Exchange Traded Future Contract [Line Items]    
Net amounts presented in the balance sheets   (35)
Securities sold under agreements to repurchase 1,797 1,996
Securities sold under agreement to repurchase    
Exchange Traded Future Contract [Line Items]    
Securities sold under agreements to repurchase 1,791 $ 1,992
S&P 500, Russell 1000, NASDAQ 100 and Emerging Market Indices    
Exchange Traded Future Contract [Line Items]    
Exchange-Traded Future Contract, Initial Margin Requirement 161  
Us Treasury Notes And Euro Dollar    
Exchange Traded Future Contract [Line Items]    
Exchange-Traded Future Contract, Initial Margin Requirement 16  
Euro Stoxx, FTSE100, EAFE And Topix Indices    
Exchange Traded Future Contract [Line Items]    
Exchange-Traded Future Contract, Initial Margin Requirement $ 15