Summarized Financial Data - Tengizchevroil LLP (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Percentage of affiliate by summarized financial information	100.00%
Sales and other operating revenues	$ 8,369	$ 8,891
Costs and other deductions	4,039	3,915
Net income attributable to TCO	$ 3,039	$ 3,502
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Equity ownership, percentage	50.00%

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