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Summarized Financial Data - Tengizchevroil LLP (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Percentage of affiliate by summarized financial information	100.00%
Sales and other operating revenues	$ 4,325	$ 3,395
Costs and other deductions	1,942	1,754
Net income attributable to TCO	$ 1,679	$ 1,158
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Equity ownership, percentage	50.00%

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