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Summarized Financial Data - Tengizchevroil LLP (Details) - USD ($) $ in Millions	9 Months Ended
	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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