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Inventories
12 Months Ended
Dec. 31, 2011
Allowance for Doubtful Accounts [Abstract]  
Inventories
Note 6.  Inventories
 
Inventories consisted of the following:

   
December 31,
 
   
2011
  
2010
 
(millions)
   
Materials and Supplies
 $56  $95 
Crude Oil
  22   17 
Total
 $78  $112