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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
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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

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