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Summarized Financial Data - Tengizchevroil LLP (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Tengizchevroil LLP |  |
Affiliate Statements Captions [Line Items] |  |
Percentage of affiliate by summarized financial information | 100.00% |
Sales and other operating revenues | $ 11,991 | $ 13,255
Costs and other deductions | 5,971 | 5,780
Net income attributable to TCO | $ 4,230 | $ 5,265
Tengizchevroil LLP |  |
Affiliate Statements Captions [Line Items] |  |
Equity ownership, percentage | 50.00% |

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