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Inventories
9 Months Ended
Sep. 30, 2011
Inventory [Abstract] 
Inventories

Note 8. Inventories

     September 30, December 31,
     2011 2010
          
      (Millions)
Natural gas liquids and olefins  $ 112 $ 87
Natural gas in underground storage    61   93
Materials, supplies, and other    114   122
     $ 287 $ 302