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Revenues and Segment Information, Geographic Information by Country for Revenue and Long-Lived Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | [1],[2] | Jun. 30, 2020 | [2] | Mar. 31, 2020 | [2] | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Revenues by Geographic Area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 16,604 | [1] | $ 15,809 | $ 10,397 | $ 22,102 | $ 27,879 | $ 27,249 | $ 28,933 | $ 24,263 | $ 64,912 | [3] | $ 108,324 | [3] | $ 117,033 | [3]
Geographic Information by Country for Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 32,152 |  |  |  |  | 31,100 |  |  |  | 32,152 |  | 31,100 |  |  |
U.S. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues by Geographic Area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 45,174 |  | 77,173 |  | 82,992 |
Geographic Information by Country for Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 28,184 |  |  |  |  | 27,485 |  |  |  | 28,184 |  | 27,485 |  |  |
Canada [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues by Geographic Area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 4,294 |  | 7,915 |  | 9,211 |
Geographic Information by Country for Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 1,877 |  |  |  |  | 1,886 |  |  |  | 1,877 |  | 1,886 |  |  |
U.K. and Ireland [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues by Geographic Area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 9,268 |  | 13,584 |  | 15,208 |
Geographic Information by Country for Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 1,353 |  |  |  |  | 1,232 |  |  |  | 1,353 |  | 1,232 |  |  |
Other Countries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues by Geographic Area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 6,176 |  | 9,652 |  | $ 9,622 |
Mexico and Peru [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic Information by Country for Long-Lived Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | $ 738 |  |  |  |  | $ 497 |  |  |  | $ 738 |  | $ 497 |  |  |
[1] | We recorded a charge of $326 million in September 2020 due to the expected liquidation of LIFO inventory layers as described in Note 5. We recognized a benefit of $102 million in December 2020 to adjust the $326 million estimate to the $224 million actual charge for the year ended December 31, 2020.
[2] | The market value of our inventories accounted for under the LIFO method fell below their historical cost on an aggregate basis as of March 31, 2020. As a result, we recorded an LCM inventory valuation adjustment of $2.5 billion in March 2020 as described in Note 5. The market value of our LIFO inventories improved due to the subsequent recovery in market prices, which resulted in a reversal of $2.2 billion in the quarter ended June 30, 2020 and the remaining amount in the quarter ended September 30, 2020.
[3] | Includes excise taxes on sales by certain of our international operations of $4,797 million, $5,595 million, and $5,626 million for the years ended December 31, 2020, 2019, and 2018.

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