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Revenues and Segment Information, Assets (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Total Assets by Reportable Segment |  |
Reportable segment assets | $ 47,747 | $ 53,864
Corporate and Eliminations [Member] |  |
Total Assets by Reportable Segment |  |
Reportable segment assets | 3,036 | 3,770
Refining [Member] | Operating Segments [Member] |  |
Total Assets by Reportable Segment |  |
Reportable segment assets | 41,465 | 47,067
Renewable Diesel [Member] | Operating Segments [Member] |  |
Total Assets by Reportable Segment |  |
Reportable segment assets | 1,632 | 1,412
Ethanol [Member] | Operating Segments [Member] |  |
Total Assets by Reportable Segment |  |
Reportable segment assets | $ 1,614 | $ 1,615

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