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Inventories (Tables)
12 Months Ended
Dec. 31, 2012
Inventories [Abstract]  
Inventories
     December 31, December 31,
     2012 2011
          
      (Millions)
Natural gas liquids, olefins, and natural gas in underground storage  $ 97 $ 98
Materials, supplies, and other    78   71
     $ 175 $ 169