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Inventories (Details) (USD $) | 12 Months Ended | 1 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2010 Paulsboro Refinery [Member]
Schedule of Inventories |  |  |  |
Refinery feedstocks | $ 2,458,000,000 | $ 2,474,000,000 |  |
Refined products and blendstocks | 2,995,000,000 | 2,633,000,000 |  |
Ethanol feedstocks and products | 191,000,000 | 195,000,000 |  |
Convenience store merchandise | 112,000,000 | 103,000,000 |  |
Materials and supplies | 217,000,000 | 218,000,000 |  |
Inventories | 5,973,000,000 | 5,623,000,000 |  |
Inventories (Textual) |  |  |  |
Effect of LIFO inventory liquidation on income, increase (decrease) | 134,000,000 | 247,000,000 | 16,000,000 | (50,000,000)
Effect of LIFO inventory liquidation on income, increase (decrease), net of tax |  |  |  | (31,000,000)
Excess of market value over carrying amount of LIFO inventories | $ 6,700,000,000 | $ 6,800,000,000 |  |

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- Definition Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 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(a)(4),(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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