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Inventories | 12 Months Ended
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Dec. 31, 2013
Inventory Disclosure [Abstract] |
INVENTORIES |
7. | INVENTORIES
Inventories consisted of the following (in millions):
| December 31,
| 2013 |  | 2012
Refinery feedstocks | $ | 2,135 |  |  | $ | 2,458 |
Refined products and blendstocks | 3,231 |  |  | 2,995 |
Ethanol feedstocks and products | 166 |  |  | 191 |
Convenience store merchandise | — |  |  | 112 |
Materials and supplies | 226 |  |  | 217 |
Inventories | $ | 5,758 |  |  | $ | 5,973 |
During the years ended December 31, 2013, 2012, and 2011, 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 $17 million, $134 million, and $247 million, respectively. As of December 31, 2013 and 2012, the replacement cost (market value) of LIFO inventories exceeded their LIFO carrying amounts by approximately $6.9 billion and $6.7 billion, respectively. As of December 31, 2013 and 2012, our non-LIFO inventories accounted for $851 million and $878 million, respectively, of our total inventories.

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- Definition The entire disclosure for inventory. This may include, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the major classes of inventory, and the nature of the cost elements included in inventory. If inventory is stated above cost, accrued net losses on firm purchase commitments for inventory and losses resulting from valuing inventory at the lower-of-cost-or-market may also be included. For LIFO inventory, may disclose the amount and basis for determining the excess of replacement or current cost over stated LIFO value and the effects of a LIFO quantities liquidation that impacts net income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a, b, c -Article 5 + Details
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