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INVESTMENTS (Details 3) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Held-to-maturity securities, by type    
Held-to-maturity securities, cost $ 0  
Held-to-maturity securities, estimated fair value 0  
Equity securities
   
Held-to-maturity securities, by type    
Held-to-maturity securities, cost 0  
Held-to-maturity securities, estimated fair value 0  
Bank and corporate debt
   
Held-to-maturity securities, by type    
Held-to-maturity securities, cost 0 113
Held-to-maturity securities, estimated fair value 0 113
Held-to-maturity securities, gross unrealized gains 0 0
Held-to-maturity securities, gross unrealized losses $ 0 $ 0