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Operating Segments and Geographic Data (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Segment Earnings | $ 3,638 | $ 2,682
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Segment Earnings | 4,080 | 2,443
Operating Segments | Upstream |  |
Segment Reporting Information [Line Items] |  |
Segment Earnings | 3,352 | 1,517
Operating Segments | Upstream | United States |  |
Segment Reporting Information [Line Items] |  |
Segment Earnings | 648 | 80
Operating Segments | Upstream | International |  |
Segment Reporting Information [Line Items] |  |
Segment Earnings | 2,704 | 1,437
Operating Segments | Downstream |  |
Segment Reporting Information [Line Items] |  |
Segment Earnings | 728 | 926
Operating Segments | Downstream | United States |  |
Segment Reporting Information [Line Items] |  |
Segment Earnings | 442 | 469
Operating Segments | Downstream | International |  |
Segment Reporting Information [Line Items] |  |
Segment Earnings | 286 | 457
All Other |  |
Segment Reporting Information [Line Items] |  |
Interest expense | (149) | (43)
Interest income | 19 | 15
Other | $ (312) | $ 267

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