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Summarized Financial Data - Tengizchevroil LLP (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Affiliate Statements Captions [Line Items]
Percentage of affiliate by summarized financial information	100.00%
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Equity method investment, ownership percentage	50.00%
Percentage of affiliate by summarized financial information	100.00%
Sales and other operating revenues	$ 13,363	$ 10,460	$ 12,811
Costs and other deductions	6,507	6,822	7,257
Net income attributable to TCO	$ 4,841	$ 2,563	$ 3,897

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