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Marketable Securities, at Fair Value
6 Months Ended
Jun. 30, 2011
Marketable Securities, at Fair Value [Abstract]  
Marketable Securities, at Fair Value
4. Marketable Securities, at Fair Value
The Company's captive insurance companies and nonqualified pension trusts hold available-for-sale securities for capitalization and funding requirements, respectively.
The amortized cost, gross unrealized gain, gross unrealized loss and fair values for available-for-sale securities by major security type are as follows:
                                 
            Gross   Gross    
    Amortized   Unrealized   Unrealized   Fair
    Cost   Gain   Loss   Value
    (In $ millions)  
Mutual funds
    70       -       -       70  
 
               
As of June 30, 2011
    70       -       -       70  
 
               
 
                               
US corporate debt securities
    1       -       -       1  
Mutual funds
    77       -       -       77  
 
               
As of December 31, 2010
    78       -       -       78