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Inventories (Tables)
12 Months Ended
Dec. 31, 2012
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following:
 
 
December 31,
 
 
2012
 
2011
(millions)
 
 
Materials and Supplies
 
$
68

 
$
56

Crude Oil
 
22

 
22

Total
 
$
90

 
$
78