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Inventories (Tables)
 12 Months Ended
Dec. 31, 2010
Inventories (Tables) [Abstract]  
Inventories
                 
    December 31,  
    2010     2009  
    (Millions)  
Natural gas liquids and olefins
  $ 87     $ 70  
Natural gas in underground storage
    93       47  
Materials, supplies, and other
    122       104  
 
           
 
  $ 302     $ 221