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Segment Information, Geographic Information by Country for Revenue and Long-Lived Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | 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
Operating revenues by geographic area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 18,777 | [1] | $ 22,579 | $ 25,118 | $ 21,330 | $ 27,859 | $ 34,408 | $ 34,914 | $ 33,663 | $ 87,804 | [2] | $ 130,844 | [2] | $ 138,074 | [2]
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 28,242 |  |  |  |  | 28,094 |  |  |  | 28,242 |  | 28,094 |  |  |
U.S. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues by geographic area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 60,319 |  | 91,499 |  | 100,418 |
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 25,210 |  |  |  |  | 24,653 |  |  |  | 25,210 |  | 24,653 |  |  |
Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues by geographic area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 6,841 |  | 10,410 |  | 9,974 |
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 1,824 |  |  |  |  | 2,161 |  |  |  | 1,824 |  | 2,161 |  |  |
U.K.and Ireland [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues by geographic area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 11,232 |  | 14,182 |  | 13,675 |
U.K. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 1,131 |  |  |  |  | 1,199 |  |  |  | 1,131 |  | 1,199 |  |  |
Other Countries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues by geographic area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 9,412 |  | 14,753 |  | $ 14,007 |
Aruba [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 57 |  |  |  |  | 59 |  |  |  | 57 |  | 59 |  |  |
Ireland [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic information by country for long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | $ 20 |  |  |  |  | $ 22 |  |  |  | $ 20 |  | $ 22 |  |  |
[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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