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Operating Segments and Geographic Data - Segement Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Total Income Tax Expense (Benefit) | $ 5,715 | $ (48) | $ (1,729)
Operating Segments | Upstream |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Income Tax Expense (Benefit) | 5,498 | (1,289) | (1,006)
Operating Segments | Upstream | United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Income Tax Expense (Benefit) | 811 | (3,538) | (1,172)
Operating Segments | Upstream | International |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Income Tax Expense (Benefit) | 4,687 | 2,249 | 166
Operating Segments | Downstream |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Income Tax Expense (Benefit) | 862 | 231 | 987
Operating Segments | Downstream | United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Income Tax Expense (Benefit) | 534 | (419) | 503
Operating Segments | Downstream | International |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Income Tax Expense (Benefit) | 328 | 650 | 484
All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Income Tax Expense (Benefit) | $ (645) | $ 1,010 | $ (1,710)

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