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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2012
Inventory Disclosure [Abstract] |
Schedule of 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 |

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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 2 -Paragraph 6 -Subparagraph a,b,c -Article 5 + Details
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