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Summarized Financial Data - Tengizchevroil LLP (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Tengizchevroil LLP |  |
Affiliate Statements Captions [Line Items] |  |
Percentage of affiliate by summarized financial information | 100.00% |
Sales and other operating revenues | $ 3,296 | $ 4,107
Costs and other deductions | 1,957 | 2,002
Net income attributable to TCO | $ 938 | $ 1,481
Tengizchevroil LLP |  |
Affiliate Statements Captions [Line Items] |  |
Equity ownership, percentage | 50.00% |

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