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Revenues and Segment Information, Geographic Information by Country for Revenue and Long-Lived Assets (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Operating Revenues by Geographic Area |  |  |  |
Revenues | [1] | $ 129,881 | $ 144,766 | $ 176,383
Geographic Information by Country for Long-Lived Assets |  |  |  |
Long-lived assets |  | 32,055 | 32,649 |
U.S. [Member] |  |  |  |
Operating Revenues by Geographic Area |  |  |  |
Revenues |  | 93,311 | 104,208 | 126,722
Geographic Information by Country for Long-Lived Assets |  |  |  |
Long-lived assets |  | 28,359 | 28,868 |
Canada [Member] |  |  |  |
Operating Revenues by Geographic Area |  |  |  |
Revenues |  | 8,577 | 10,107 | 11,743
Geographic Information by Country for Long-Lived Assets |  |  |  |
Long-lived assets |  | 1,414 | 1,598 |
U.K. and Ireland [Member] |  |  |  |
Operating Revenues by Geographic Area |  |  |  |
Revenues |  | 15,236 | 16,148 | 17,822
Geographic Information by Country for Long-Lived Assets |  |  |  |
Long-lived assets |  | 1,484 | 1,346 |
Mexico and Peru [Member] |  |  |  |
Operating Revenues by Geographic Area |  |  |  |
Revenues |  | 5,405 | 6,438 | 8,396
Geographic Information by Country for Long-Lived Assets |  |  |  |
Long-lived assets |  | 798 | 837 |
Other Countries [Member] |  |  |  |
Operating Revenues by Geographic Area |  |  |  |
Revenues |  | $ 7,352 | $ 7,865 | $ 11,700
[1] | Includes excise taxes on sales by certain of our foreign operations of $5,907 million, $5,765 million, and $5,194 million for the years ended December 31, 2024, 2023, and 2022.

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