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Revenues and Segment Information, Assets (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Total Assets by Reportable Segment |  |
Reportable segment assets | $ 49,376 | $ 50,158
Corporate, Non-Segment [Member] |  |
Total Assets by Reportable Segment |  |
Reportable segment assets | 5,777 | 6,915
Refining [Member] | Operating Segments [Member] |  |
Total Assets by Reportable Segment |  |
Reportable segment assets | 40,699 | 40,382
Ethanol [Member] | Operating Segments [Member] |  |
Total Assets by Reportable Segment |  |
Reportable segment assets | 1,355 | 1,344
VLP [Member] | Operating Segments [Member] |  |
Total Assets by Reportable Segment |  |
Reportable segment assets | $ 1,545 | $ 1,517

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