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Inventories (Tables)
 6 Months Ended
Jun. 30, 2011
Inventory [Abstract]  
Inventories
                 
    June 30,     December 31,  
    2011     2010  
    (Millions)  
Natural gas liquids and olefins
  $ 88     $ 87  
Natural gas in underground storage
    81       93  
Materials, supplies, and other
    113       122  
 
           
 
  $ 282     $ 302