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Summarized Financial Data - Tengizchevroil LLP - Summary of Income Statement Information (Details) - USD ($) $ in Millions	12 Months Ended
	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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