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Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Segment information for our reportable segments |  |  |  |
Operating revenues | [1] | $ 15,714 | $ 21,330 |
Lower of cost or market inventory valuation adjustment |  | (293) | 0 |
Operating income (loss) |  | 829 | 1,495 |
Total assets by reportable segment |  |  |  |
Reportable segment assets |  | 44,259 |  | $ 44,227
Refining [Member] |  |  |  |
Segment information for our reportable segments |  |  |  |
Operating revenues |  | 14,920 | 20,529 |
Total assets by reportable segment |  |  |  |
Reportable segment assets |  | 38,427 |  | 38,068
Ethanol [Member] |  |  |  |
Segment information for our reportable segments |  |  |  |
Operating revenues |  | 794 | 801 |
Total assets by reportable segment |  |  |  |
Reportable segment assets |  | 1,040 |  | 1,016
Corporate and Other [Member] |  |  |  |
Total assets by reportable segment |  |  |  |
Reportable segment assets |  | 4,792 |  | $ 5,143
Operating Segments [Member] |  |  |  |
Segment information for our reportable segments |  |  |  |
Operating revenues |  | 15,748 | 21,358 |
Operating Segments [Member] | Refining [Member] |  |  |  |
Segment information for our reportable segments |  |  |  |
Operating revenues |  | 14,920 | 20,529 |
Lower of cost or market inventory valuation adjustment |  | (263) |  |
Operating income (loss) |  | 958 | 1,641 |
Operating Segments [Member] | Ethanol [Member] |  |  |  |
Segment information for our reportable segments |  |  |  |
Operating revenues |  | 828 | 829 |
Lower of cost or market inventory valuation adjustment |  | (30) |  |
Operating income (loss) |  | 39 | 12 |
Intersegment Eliminations [Member] |  |  |  |
Segment information for our reportable segments |  |  |  |
Operating revenues |  | 34 | 28 |
Intersegment Eliminations [Member] | Refining [Member] |  |  |  |
Segment information for our reportable segments |  |  |  |
Operating revenues |  | 0 | 0 |
Intersegment Eliminations [Member] | Ethanol [Member] |  |  |  |
Segment information for our reportable segments |  |  |  |
Operating revenues |  | 34 | 28 |
Corporate, Non-Segment [Member] | Corporate and Other [Member] |  |  |  |
Segment information for our reportable segments |  |  |  |
Operating income (loss) |  | $ (168) | $ (158) |
[1] | Includes excise taxes on sales by certain of our international operations of $1,395 million and $1,426 million for the three months ended March 31, 2016 and 2015, respectively.

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