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Segment Information, Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Total Assets by Reportable Segment    
Reportable segment assets $ 45,974 $ 46,173
Corporate, Non-Segment [Member]    
Total Assets by Reportable Segment    
Reportable segment assets 6,187 5,790
Refining [Member]    
Total Assets by Reportable Segment    
Reportable segment assets 37,401 38,095
Ethanol [Member]    
Total Assets by Reportable Segment    
Reportable segment assets 1,314 1,316
VLP [Member]    
Total Assets by Reportable Segment    
Reportable segment assets $ 1,072 $ 972