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Summarized Financial Data - Tengizchevroil LLP (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Affiliate Statements Captions [Line Items]
Sales and other operating revenues	$ 36,117	$ 15,926	$ 67,193	$ 45,631
Net Income (Loss)	$ 3,094	$ (8,277)	$ 4,492	(4,696)
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Percentage of affiliate by summarized financial information	100.00%		100.00%
Sales and other operating revenues			$ 7,368	4,567
Costs and other deductions			3,935	3,166
Net Income (Loss)			$ 2,403	$ 984
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Equity ownership, percentage	50.00%		50.00%

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