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INVESTMENTS (Derivatives) (DETAILS2) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Investments, Debt and Equity Securities [Abstract]    
Collateralized derivative transactions $ 1 $ 4
Collateral arrangements 29 3
Cash and securities collateral 1,691 1,438
S&P 500, Russell 1000, NASDAQ 100 and Emerging Market Indices [Member]
   
Exchange Traded Future Contract [Line Items]    
Exchange-Traded Future Contract, Initial Margin Requirement 330  
US Treasury Notes And Euro Dollars [Member]
   
Exchange Traded Future Contract [Line Items]    
Exchange-Traded Future Contract, Initial Margin Requirement 121  
Euro Stoxx, FTSE 100, EAFE And Topix Indices [Member]
   
Exchange Traded Future Contract [Line Items]    
Exchange-Traded Future Contract, Initial Margin Requirement $ 8