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Revenues and Segment Information, Total Assets by Reportable Segments (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Total Assets by Reportable Segments
Reportable segment assets	$ 51,774	$ 53,864
Equity Method Investments (Textual):
Investments in unconsolidated joint ventures	972	942
Corporate and Eliminations [Member]
Total Assets by Reportable Segments
Reportable segment assets	5,448	3,770
Refining [Member]
Equity Method Investments (Textual):
Investments in unconsolidated joint ventures	972	942
Refining [Member] | Operating Segments [Member]
Total Assets by Reportable Segments
Reportable segment assets	42,939	46,613
Renewable Diesel [Member] | Operating Segments [Member]
Total Assets by Reportable Segments
Reportable segment assets	1,659	1,412
Ethanol [Member] | Operating Segments [Member]
Total Assets by Reportable Segments
Reportable segment assets	$ 1,728	$ 2,069

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