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Supplemental Balance Sheet Information (Tables)
 6 Months Ended
Jun. 30, 2011
Supplemental Balance Sheet Information [Abstract]  
Total inventories
                 
    As of     As of  
    June 30,     December 31,  
(millions)   2011     2010  
 
Finished goods and work in progress
  $ 250     $ 227  
Raw materials
    63       63  
 
Total
  $ 313     $ 290  
 
Changes in the liability for asset retirement obligations
                 
    Six Months  
    ended June 30,
(millions)   2011     2010  
 
Balance as of January 1
  $ 103     $ 101  
Accretion expense
    2       2  
Foreign currency translation
    1       —  
 
Balance as of June 30
  $ 106     $ 103