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Accounts Receivable (Tables)
6 Months Ended
Jun. 30, 2012
Accounts Receivable, Net, Current [Abstract]  
Accounts Receivable
         
    June 30, 2012 December 31, 2011
    (In millions)
 Revenue $ 310 $ 301
 Joint interest   98   96
 Other   9   11
 Reserve for doubtful accounts   (1)   (1)
  Total accounts receivable $ 416 $ 407