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Revenues and Segment Information, Assets (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Total Assets by Reportable Segment |  |
Reportable segment assets | $ 52,095 | $ 50,155
Corporate and Eliminations [Member] |  |
Total Assets by Reportable Segment |  |
Reportable segment assets | 4,046 | 4,189
Refining [Member] | Operating Segments [Member] |  |
Total Assets by Reportable Segment |  |
Reportable segment assets | 45,487 | 43,488
Ethanol [Member] | Operating Segments [Member] |  |
Total Assets by Reportable Segment |  |
Reportable segment assets | 1,718 | 1,691
Renewable Diesel [Member] | Operating Segments [Member] |  |
Total Assets by Reportable Segment |  |
Reportable segment assets | $ 844 | $ 787

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