Segment Information, Assets (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Total Assets by Reportable Segment
Reportable segment assets	$ 46,047	$ 46,173
Corporate, Non-Segment [Member]
Total Assets by Reportable Segment
Reportable segment assets	5,451	5,790
Refining [Member]
Total Assets by Reportable Segment
Reportable segment assets	38,219	38,095
Ethanol [Member]
Total Assets by Reportable Segment
Reportable segment assets	1,338	1,316
VLP [Member]
Total Assets by Reportable Segment
Reportable segment assets	$ 1,039	$ 972