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Acquisition and Divestitures Acquisition (Policies)	9 Months Ended
Acquisition and Divestitures Acquisition (Policies)	Sep. 30, 2017
Business Combinations [Abstract]
Business Combinations Policy [Policy Text Block]	We accounted for the Western Refining Acquisition using the acquisition method of accounting, which requires, among other things, that assets acquired at their fair values and liabilities assumed be recognized on the balance sheet as of the acquisition date.