Revenues and Segment Information, Total Assets by Reportable Segments (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Total Assets by Reportable Segments
Reportable segment assets	$ 53,864	$ 50,155
Equity Method Investments (Textual):
Investments in unconsolidated joint ventures	942	542
Refining [Member]
Equity Method Investments (Textual):
Investments in unconsolidated joint ventures	942	542
Operating Segments [Member] | Refining [Member]
Total Assets by Reportable Segments
Reportable segment assets	47,067	43,488
Operating Segments [Member] | Ethanol [Member]
Total Assets by Reportable Segments
Reportable segment assets	1,615	1,691
Operating Segments [Member] | Renewable Diesel [Member]
Total Assets by Reportable Segments
Reportable segment assets	1,412	787
Corporate and Eliminations [Member]
Total Assets by Reportable Segments
Reportable segment assets	$ 3,770	$ 4,189