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Debt and Financing Costs (Tables)
6 Months Ended
Jun. 30, 2011
Debt and Financing Costs [Abstract]  
Carrying amounts and estimated fair values of the Company's debt
     The following table presents the carrying amounts and estimated fair values of the Company’s outstanding debt at June 30, 2011 and December 31, 2010:
                                 
    June 30, 2011   December 31, 2010
    Carrying   Fair   Carrying   Fair
    Amount   Value   Amount   Value
            (In millions)          
Money market lines of credit
  $ 48     $ 48     $ 46     $ 46  
Commercial paper
    620       620       913       913  
Notes and debentures
    7,184       7,818       7,182       7,870  
 
               
Total Debt
  $ 7,852     $ 8,486     $ 8,141     $ 8,829  
 
               
Financing Costs, Net
     Financing costs incurred during the periods comprised the following:
                                 
    For the Quarter Ended     For the Six Months Ended  
    June 30,   June 30,
    2011   2010   2011   2010
            (In millions)          
Interest expense
  $ 109     $ 75     $ 217     $ 151  
Amortization of deferred loan costs
    1       1       3       3  
Capitalized interest
    (63 )     (18 )     (124 )     (35 )
Interest income
    (6 )     (2 )     (10 )     (4 )
 
                   
Financing costs, net
  $ 41     $ 56     $ 86     $ 115