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Segment Information, Revenue by Product (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | [1] | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 18,777 | $ 22,579 | $ 25,118 | $ 21,330 | $ 27,859 | $ 34,408 | $ 34,914 | $ 33,663 | $ 87,804 | [2] | $ 130,844 | [2] | $ 138,074 | [2]
Refining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 84,521 |  | 126,004 |  | 129,064 |
Refining [Member] | Gasoline and Blendstocks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 38,983 |  | 56,846 |  | 57,806 |
Refining [Member] | Distillates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 38,093 |  | 57,521 |  | 56,921 |
Refining [Member] | Petrochemicals [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1,824 |  | 3,759 |  | 4,281 |
Refining [Member] | Lubes and Asphalts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 874 |  | 1,397 |  | 1,643 |
Refining [Member] | Other Product Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 4,747 |  | 6,481 |  | 8,413 |
Ethanol [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 3,283 |  | 4,840 |  | 5,114 |
Ethanol [Member] | Ethanol [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 2,628 |  | 4,192 |  | 4,245 |
Ethanol [Member] | Distillers Grains [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 655 |  | 648 |  | 869 |
Retail [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 3,896 |
Retail [Member] | Fuel Sales Gasoline and Diesel [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 3,226 |
Retail [Member] | Merchandise Sales and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 524 |
Retail [Member] | Home Heating Oil [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  | $ 146 |
[1] | Operating income for the quarter ended December 31, 2015 reflects a noncash lower of cost or market inventory valuation adjustment of $790 million, as described in Note 6.
[2] | Includes excise taxes on sales by certain of our international operations of $5,980 million, $5,901 million, and $5,459 million.

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