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Inventories (Tables)
9 Months Ended
Sep. 30, 2011
Inventories [Abstract] 
Schedule of inventories
Inventories consisted of the following (in millions):

 
September 30,
2011
 
December 31,
2010
Refinery feedstocks
$
2,502

 
$
2,225

Refined products and blendstocks
2,217

 
2,233

Ethanol feedstocks and products
130

 
201

Convenience store merchandise
102

 
101

Materials and supplies
213

 
187

Inventories
$
5,164

 
$
4,947