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Inventories
12 Months Ended
Dec. 31, 2012
Inventory Disclosure [Abstract]  
INVENTORIES
6.
INVENTORIES
Inventories consisted of the following (in millions):
 
December 31,
 
2012
 
2011
Refinery feedstocks
$
2,458

 
$
2,474

Refined products and blendstocks
2,995

 
2,633

Ethanol feedstocks and products
191

 
195

Convenience store merchandise
112

 
103

Materials and supplies
217

 
218

Inventories
$
5,973

 
$
5,623


During the years ended December 31, 2012, 2011, and 2010, we had net liquidations of LIFO inventory layers that were established in prior years, which decreased cost of sales in each of those years by $134 million, $247 million, and $16 million, respectively. The effect of the liquidation in 2010 excludes the impact from the sale of inventory in connection with the sale of our Paulsboro Refinery to PBF Holding. The effect of the 2010 liquidation attributable to the sale of that inventory increased the loss on the sale of the Paulsboro Refinery by $50 million ($31 million after taxes) as discussed in Note 3 and is reflected in discontinued operations.

As of December 31, 2012 and 2011, the replacement cost (market value) of LIFO inventories exceeded their LIFO carrying amounts by approximately $6.7 billion and $6.8 billion, respectively.