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Operating Segments and Geographic Data (Details 3) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Total Income Tax Expense (Benefit) | $ (48) | $ (1,729) | $ 132
Operating Segments | Upstream |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Income Tax Expense (Benefit) | (1,289) | (1,006) | (827)
Operating Segments | Upstream | United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Income Tax Expense (Benefit) | (3,538) | (1,172) | (2,041)
Operating Segments | Upstream | International |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Income Tax Expense (Benefit) | 2,249 | 166 | 1,214
Operating Segments | Downstream |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Income Tax Expense (Benefit) | 231 | 987 | 2,633
Operating Segments | Downstream | United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Income Tax Expense (Benefit) | (419) | 503 | 1,320
Operating Segments | Downstream | International |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Income Tax Expense (Benefit) | 650 | 484 | 1,313
All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Income Tax Expense (Benefit) | $ 1,010 | $ (1,710) | $ (1,674)

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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