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Summarized Financial Data - Tengizchevroil LLP (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Tengizchevroil LLP |  |
Affiliate Statements Captions [Line Items] |  |
Percentage of affiliate by summarized financial information | 100.00% |
Sales and other operating revenues | $ 13,255 | $ 9,619
Costs and other deductions | 5,780 | 4,806
Net income attributable to TCO | $ 5,265 | $ 3,402
Tengizchevroil LLP |  |
Affiliate Statements Captions [Line Items] |  |
Equity ownership, percentage | 50.00% |

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