Summarized Financial Data - Tengizchevroil LLP (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Percentage of affiliate by summarized financial information	100.00%
Sales and other operating revenues	$ 11,991	$ 13,255
Costs and other deductions	5,971	5,780
Net income attributable to TCO	$ 4,230	$ 5,265
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Equity ownership, percentage	50.00%

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