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Segment Information, Assets (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
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Total Assets by Reportable Segment |  |
Reportable segment assets | $ 45,974 | $ 46,173
Corporate, Non-Segment [Member] |  |
Total Assets by Reportable Segment |  |
Reportable segment assets | 6,187 | 5,790
Refining [Member] |  |
Total Assets by Reportable Segment |  |
Reportable segment assets | 37,401 | 38,095
Ethanol [Member] |  |
Total Assets by Reportable Segment |  |
Reportable segment assets | 1,314 | 1,316
VLP [Member] |  |
Total Assets by Reportable Segment |  |
Reportable segment assets | $ 1,072 | $ 972

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