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Inventories (Tables)
6 Months Ended
Jun. 30, 2013
Inventories [Abstract]  
Inventories
     June 30, December 31,
     2013 2012
          
      (Millions)
Natural gas liquids, olefins, and natural gas in underground storage  $ 92 $ 97
Materials, supplies, and other    82   78
     $ 174 $ 175