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Operating Segments and Geographic Data - Segment Sales and Operating Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues | [1] | $ 158,902 |  |
Total Sales and Other Operating Revenues | [1] |  | $ 134,674 | $ 110,215
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 191,228 |  |
Total Sales and Other Operating Revenues |  |  | 157,505 | 129,030
Intersegment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | (32,326) |  |
Total Sales and Other Operating Revenues |  |  | (22,831) | (18,815)
Total All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 1,044 |  |
Total Sales and Other Operating Revenues |  |  | 1,048 | 1,142
United States |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 1,022 |  |
Total Sales and Other Operating Revenues |  |  | 1,022 | 1,105
United States | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 83,289 |  |
Total Sales and Other Operating Revenues |  |  | 67,404 | 56,187
United States | Intersegment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 786 |  |
Total Sales and Other Operating Revenues |  |  | 814 | 960
United States | All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 236 |  |
Total Sales and Other Operating Revenues |  |  | 208 | 145
International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 22 |  |
Total Sales and Other Operating Revenues |  |  | 26 | 37
International | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 107,939 |  |
Total Sales and Other Operating Revenues |  |  | 90,101 | 72,843
International | Intersegment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 22 |  |
Total Sales and Other Operating Revenues |  |  | 25 | 36
International | All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 0 |  |
Total Sales and Other Operating Revenues |  |  | 1 | 1
Upstream |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 60,713 |  |
Total Sales and Other Operating Revenues |  |  | 41,922 | 33,145
Upstream | United States |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 22,891 |  |
Total Sales and Other Operating Revenues |  |  | 13,242 | 10,365
Upstream | United States | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 8,926 |  |
Total Sales and Other Operating Revenues |  |  | 3,901 | 3,148
Upstream | United States | Intersegment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 13,965 |  |
Total Sales and Other Operating Revenues |  |  | 9,341 | 7,217
Upstream | International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 37,822 |  |
Total Sales and Other Operating Revenues |  |  | 28,680 | 22,780
Upstream | International | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 24,143 |  |
Total Sales and Other Operating Revenues |  |  | 17,209 | 13,262
Upstream | International | Intersegment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 13,679 |  |
Total Sales and Other Operating Revenues |  |  | 11,471 | 9,518
Downstream |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 129,471 |  |
Total Sales and Other Operating Revenues |  |  | 114,535 | 94,743
Downstream | United States |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 59,376 |  |
Total Sales and Other Operating Revenues |  |  | 53,140 | 44,717
Downstream | United States | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 56,634 |  |
Total Sales and Other Operating Revenues |  |  | 48,728 | 40,366
Downstream | United States | Intersegment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 2,742 |  |
Total Sales and Other Operating Revenues |  |  | 14 | 16
Downstream | United States | Excise and similar taxes |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 0 |  |
Total Sales and Other Operating Revenues |  |  | 4,398 | 4,335
Downstream | International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 70,095 |  |
Total Sales and Other Operating Revenues |  |  | 61,395 | 50,026
Downstream | International | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 68,963 |  |
Total Sales and Other Operating Revenues |  |  | 57,438 | 46,388
Downstream | International | Intersegment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | 1,132 |  |
Total Sales and Other Operating Revenues |  |  | 1,166 | 1,068
Downstream | International | Excise and similar taxes |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total Sales and Other Operating Revenues |  | $ 0 |  |
Total Sales and Other Operating Revenues |  |  | $ 2,791 | $ 2,570
[1] | 2017 and 2016 include excise, value-added and similar taxes of $7,189 and $6,905, respectively, collected on behalf of third parties. Beginning in 2018, these taxes are netted in "Taxes other than on income" in accordance with Accounting Standards Update (ASU) 2014-09. Refer to Note 25, "Revenue" beginning on page 88.

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