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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | [2] | Jun. 30, 2016 | [3] | Mar. 31, 2016 | [4] | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Revenues by Geographic Area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 26,392 | [1] | $ 23,562 | $ 22,254 | $ 21,772 | $ 20,712 | $ 19,649 | $ 19,584 | $ 15,714 | $ 93,980 | [5] | $ 75,659 | [5] | $ 87,804 | [5]
Geographic Information by Country for Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 29,061 |  |  |  |  | 28,142 |  |  |  | 29,061 |  | 28,142 |  |  |
U.S. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues by Geographic Area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 66,614 |  | 51,479 |  | 60,319 |
Geographic Information by Country for Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 26,083 |  |  |  |  | 25,359 |  |  |  | 26,083 |  | 25,359 |  |  |
Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues by Geographic Area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 7,039 |  | 6,115 |  | 6,841 |
Geographic Information by Country for Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 1,915 |  |  |  |  | 1,816 |  |  |  | 1,915 |  | 1,816 |  |  |
U.K.and Ireland [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues by Geographic Area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 11,556 |  | 10,797 |  | 11,232 |
Geographic Information by Country for Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | $ 1,063 |  |  |  |  | $ 967 |  |  |  | 1,063 |  | 967 |  |  |
Other Countries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues by Geographic Area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | $ 8,771 |  | $ 7,268 |  | $ 9,412 |
[1] | During the quarter ended December 31, 2017, we recognized an income tax benefit of $1.9 billion related to Tax Reform as described in Note 14.
[2] | During the quarter ended September 30, 2016, we recognized a tax benefit of $42 million related to the Aruba Disposition as described in Note 2.
[3] | During the quarter ended June 30, 2016, we recognized a favorable noncash lower of cost or market inventory valuation adjustment of $454 million as described in Note 4 and an asset impairment loss of $56 million related to the Aruba Disposition as described in Note 2.
[4] | During the quarter ended March 31, 2016, we recognized a favorable noncash lower of cost or market inventory valuation adjustment of $293 million as described in Note 4.
[5] | Includes excise taxes on sales by certain of our international operations of $5,573 million, $5,493 million, and $5,980 million for the years ended December 31, 2017, 2016, and 2015.

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