Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended									3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		1 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Refining [Member]	Dec. 31, 2013 Refining [Member]	Jun. 30, 2014 Ethanol [Member]	Dec. 31, 2013 Ethanol [Member]	Jun. 30, 2014 Corporate and Other [Member]	Dec. 31, 2013 Corporate and Other [Member]	Jun. 30, 2014 Operating Segments [Member] Refining [Member]	Jun. 30, 2013 Operating Segments [Member] Refining [Member]	Jun. 30, 2014 Operating Segments [Member] Refining [Member]	Jun. 30, 2013 Operating Segments [Member] Refining [Member]	Jun. 30, 2014 Operating Segments [Member] Ethanol [Member]	Jun. 30, 2013 Operating Segments [Member] Ethanol [Member]	Jun. 30, 2014 Operating Segments [Member] Ethanol [Member]	Jun. 30, 2013 Operating Segments [Member] Ethanol [Member]	Jun. 30, 2014 Operating Segments [Member] Retail [Member]	Jun. 30, 2013 Operating Segments [Member] Retail [Member]	Jun. 30, 2014 Operating Segments [Member] Retail [Member]	Jun. 30, 2013 Operating Segments [Member] Retail [Member]	Jun. 30, 2014 Corporate, Non-Segment [Member] Corporate and Other [Member]	Jun. 30, 2013 Corporate, Non-Segment [Member] Corporate and Other [Member]	Jun. 30, 2014 Corporate, Non-Segment [Member] Corporate and Other [Member]	Jun. 30, 2013 Corporate, Non-Segment [Member] Corporate and Other [Member]	Jun. 30, 2014 Intersegment Eliminations [Member]	Jun. 30, 2013 Intersegment Eliminations [Member]	Jun. 30, 2014 Intersegment Eliminations [Member]	Jun. 30, 2013 Intersegment Eliminations [Member]	Jun. 30, 2014 Intersegment Eliminations [Member] Refining [Member]	Jun. 30, 2013 Intersegment Eliminations [Member] Refining [Member]	Jun. 30, 2014 Intersegment Eliminations [Member] Refining [Member]	Jun. 30, 2013 Intersegment Eliminations [Member] Refining [Member]	Jun. 30, 2014 Intersegment Eliminations [Member] Ethanol [Member]	Jun. 30, 2013 Intersegment Eliminations [Member] Ethanol [Member]	Jun. 30, 2014 Intersegment Eliminations [Member] Ethanol [Member]	Jun. 30, 2013 Intersegment Eliminations [Member] Ethanol [Member]	Jun. 30, 2014 Intersegment Eliminations [Member] Retail [Member]	Jun. 30, 2013 Intersegment Eliminations [Member] Retail [Member]	Jun. 30, 2014 Intersegment Eliminations [Member] Retail [Member]	Jun. 30, 2013 Intersegment Eliminations [Member] Retail [Member]	Mar. 31, 2014 Mount Vernon [Member]
Segment information for our reportable segments
Operating revenues	$ 34,914	$ 34,034	$ 68,577	$ 67,508								$ 33,457	$ 31,564	$ 65,909	$ 61,117	$ 1,457	$ 1,491	$ 2,668	$ 2,495	$ 0	$ 979	$ 0	$ 3,896	$ 0	$ 0	$ 0	$ 0	$ 9	$ 686	$ 34	$ 2,946	$ 0	$ 671	$ 0	$ 2,876	$ 9	$ 15	$ 34	$ 70	$ 0	$ 0	$ 0	$ 0
Operating income (loss)	1,085	805	2,436	1,863								1,079	918	2,359	2,127	187	95	430	109	0	39	0	81	(181)	(247)	(353)	(454)
Total assets by reportable segment
Reportable segment assets	47,013		47,013		47,260	41,326	40,834	937	889	4,750	5,537
Payments to Acquire Ethanol Plant (Textual)
Payments to acquire idled corn ethanol plant																																												$ 34