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Basis of Presentation and Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2011 | Jan. 21, 2011 | Dec. 31, 2012 plants refineries retail_sites branded_wholesale_sites
Basis of Presentation and Summary of Significant Accounting Policies (Textual) |  |  |
Number of refineries owned |  |  | 16
Combined total throughput capacity of petroleum refining |  |  | 3,000,000
Number of company-owned and leased retail sites |  |  | 1,880
Number of branded wholesale sites |  |  | 5,450
Number of ethanol plants owned |  |  | 10
Combined capacity of ethanol (gallons per year) |  |  | 1,100,000,000
Date of joint venture agreement |  | Jan. 21, 2011 |
Feed capacity of diesel plants |  | 10,000 |
Estimated aggregate cost to construct diesel plant |  | $ 368 |
Date of joint venture construction financing agreement | May 31, 2011 |  |
Maximum amount of joint venture construction financing | $ 221 |  |
Maximum percentage of joint venture construction costs financed | 0.60 |  |
Maximum maturity period (in months) of temporary cash investments |  |  | 3 months
Period (in years) of estimated undiscounted future costs resulted in environmental liabilities |  |  | 20 years
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Basis of Presentation and Summary of Significant Accounting Policies (Textual) |  |  |
Joint venture ownership percentage |  |  | 50.00%
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Basis of Presentation and Summary of Significant Accounting Policies (Textual) |  |  |
Joint venture ownership percentage |  |  | 50.00%
Minimum [Member] |  |  |
Basis of Presentation and Summary of Significant Accounting Policies (Textual) |  |  |
Property, plant and equipment, useful life |  |  | 25 years
Maximum [Member] |  |  |
Basis of Presentation and Summary of Significant Accounting Policies (Textual) |  |  |
Property, plant and equipment, useful life |  |  | 30 years

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition Date the relationship between reporting entity and the Variable Interest Entity (VIE) began, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7880789&loc=SL6759159-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=7880789&loc=d3e5747-111685 + Details
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- Definition Combined capacity of ethanol (gallons per year) + References No definition available. + Details
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- Definition Number of branded wholesale sites that sell our refined products. + References No definition available. + Details
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- Definition Number of company-owned and leased retail sites that sell our refined products. + References No definition available. + Details
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