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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2011
Fair Value Measurements [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring Basis
     The following table presents the Company’s derivative assets and liabilities measured at fair value on a recurring basis for each hierarchy level:
                                                 
    Fair Value Measurements Using                    
    Quoted
Price in
      Significant   Significant                    
    Active     Other     Unobservable     Total              
    Markets     Inputs     Inputs     Fair           Carrying  
    (Level 1)     (Level 2)     (Level 3)     Value     Netting (1)     Amount  
                (In millions)              
June 30, 2011
                                               
Assets:
                                               
Commodity Derivative Instruments
  $     $ 369     $     $ 369     $ (111 )   $ 258  
 
                                               
Liabilities:
                                               
Commodity Derivative Instruments
          465             465       (111 )     354  
 
                                               
December 31, 2010
                                               
Assets:
                                               
Commodity Derivative Instruments
  $     $ 454     $     $ 454     $ (148 )   $ 306  
 
                                               
Liabilities:
                                               
Commodity Derivative Instruments
          466             466       (148 )     318  
 
(1)   The derivative fair values above are based on analysis of each contract on a gross basis, even where the legal right of offset exits, as required by ASC Topic 820. The carrying amounts of derivative assets and liabilities reported on the consolidated balance sheet are determined by netting asset and liability positions where counterparty master netting arrangements contain provisions for net settlement. See Note 3 — Derivative Instruments and Hedging Activities of this Form 10-Q for a discussion of amounts recorded on the consolidated balance sheet at June 30, 2011 and December 31, 2010.