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Summarized Financial Data - Tengizchevroil LLP - Summary of Income Statement Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Affiliate Statements Captions [Line Items] |  |  |
Percentage of affiliate by summarized financial information | 100.00% |  |
Tengizchevroil LLP |  |  |
Affiliate Statements Captions [Line Items] |  |  |
Percentage of affiliate by summarized financial information | 100.00% |  |
Sales and other operating revenues | $ 17,260 | $ 13,363 | $ 10,460
Costs and other deductions | 7,446 | 6,507 | 6,822
Net income attributable to affiliates | $ 6,908 | $ 4,841 | $ 2,563
Tengizchevroil LLP |  |  |
Affiliate Statements Captions [Line Items] |  |  |
Equity method investment, ownership percentage | 50.00% |  |

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