Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			1 Months Ended							3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Mar. 31, 2014 Mount Vernon [Member]	Sep. 30, 2014 Refining [Member]	Dec. 31, 2013 Refining [Member]	Sep. 30, 2014 Ethanol [Member]	Dec. 31, 2013 Ethanol [Member]	Sep. 30, 2014 Corporate and Other [Member]	Dec. 31, 2013 Corporate and Other [Member]	Sep. 30, 2014 Operating Segments [Member] Refining [Member]	Sep. 30, 2013 Operating Segments [Member] Refining [Member]	Sep. 30, 2014 Operating Segments [Member] Refining [Member]	Sep. 30, 2013 Operating Segments [Member] Refining [Member]	Sep. 30, 2014 Operating Segments [Member] Ethanol [Member]	Sep. 30, 2013 Operating Segments [Member] Ethanol [Member]	Sep. 30, 2014 Operating Segments [Member] Ethanol [Member]	Sep. 30, 2013 Operating Segments [Member] Ethanol [Member]	Sep. 30, 2014 Operating Segments [Member] Retail [Member]	Sep. 30, 2013 Operating Segments [Member] Retail [Member]	Sep. 30, 2014 Operating Segments [Member] Retail [Member]	Sep. 30, 2013 Operating Segments [Member] Retail [Member]	Sep. 30, 2014 Corporate, Non-Segment [Member] Corporate and Other [Member]	Sep. 30, 2013 Corporate, Non-Segment [Member] Corporate and Other [Member]	Sep. 30, 2014 Corporate, Non-Segment [Member] Corporate and Other [Member]	Sep. 30, 2013 Corporate, Non-Segment [Member] Corporate and Other [Member]	Sep. 30, 2014 Intersegment Eliminations [Member]	Sep. 30, 2013 Intersegment Eliminations [Member]	Sep. 30, 2014 Intersegment Eliminations [Member]	Sep. 30, 2013 Intersegment Eliminations [Member]	Sep. 30, 2014 Intersegment Eliminations [Member] Refining [Member]	Sep. 30, 2013 Intersegment Eliminations [Member] Refining [Member]	Sep. 30, 2014 Intersegment Eliminations [Member] Refining [Member]	Sep. 30, 2013 Intersegment Eliminations [Member] Refining [Member]	Sep. 30, 2014 Intersegment Eliminations [Member] Ethanol [Member]	Sep. 30, 2013 Intersegment Eliminations [Member] Ethanol [Member]	Sep. 30, 2014 Intersegment Eliminations [Member] Ethanol [Member]	Sep. 30, 2013 Intersegment Eliminations [Member] Ethanol [Member]	Sep. 30, 2014 Intersegment Eliminations [Member] Retail [Member]	Sep. 30, 2013 Intersegment Eliminations [Member] Retail [Member]	Sep. 30, 2014 Intersegment Eliminations [Member] Retail [Member]	Sep. 30, 2013 Intersegment Eliminations [Member] Retail [Member]
Segment information for our reportable segments
Operating revenues	$ 34,408	$ 36,137	$ 102,985	$ 103,645									$ 33,274	$ 34,747	$ 99,183	$ 95,864	$ 1,134	$ 1,390	$ 3,802	$ 3,885	$ 0	$ 0	$ 0	$ 3,896	$ 0	$ 0	$ 0	$ 0	$ 21	$ 16	$ 55	$ 2,962	$ 0	$ 0	$ 0	$ 2,876	$ 21	$ 16	$ 55	$ 86	$ 0	$ 0	$ 0	$ 0
Operating income (loss)	1,670	532	4,106	2,395									1,664	600	4,023	2,727	198	113	628	222	0	0	0	81	(192)	(181)	(545)	(635)
Total assets by reportable segment
Reportable segment assets	48,455		48,455		47,260		42,378	41,227	916	889	5,161	5,144
Payments to Acquire Ethanol Plant (Textual)
Payments to acquire idled corn ethanol plant						$ 34