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Basis of Presentation and Significant Accounting Policies (Details) bbl / d in Millions, $ in Millions, gal / yr in Billions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) gal / yr bbl / d refineries plants branded_wholesale_sites | Dec. 31, 2014 USD ($)
Basis of Presentation and Summary of Significant Accounting Policies (Textual) |  |
Number of refineries owned | refineries | 15 |
Combined total throughput capacity of petroleum refining (barrels per day) | bbl / d | 3.0 |
Number of branded wholesale sites | branded_wholesale_sites | 7,500 |
Number of ethanol plants owned | plants | 11 |
Combined capacity of ethanol (gallons per year) | gal / yr | 1.4 |
New Accounting Pronouncements (Textual) |  |
Current deferred income tax assets | $ 74 | $ 162
Current deferred income tax liabilities | 366 | $ 376
Issued Debt [Member] |  |
New Accounting Pronouncements (Textual) |  |
Debt issuance costs associated with issued debt | $ 42 |
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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