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Acquisitions (Tables)
9 Months Ended
Sep. 30, 2011
Table Text Block [Abstract] 
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed
      
      
millions  
Properties and equipment $298
Intangible assets  165
Deferred income taxes  31
Other assets  4
Other liabilities  (21)
Goodwill  362
  Total assets acquired and liabilities assumed  839
Less: Fair value of Anadarko's pre-acquisition 7% equity interest in the Wattenberg Plant  37
  Acquisition of midstream businesses  802
Loss on Anadarko's preexisting contracts with the previous Wattenberg Plant owner  76
  Total consideration paid $878