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Summarized Financial Data - Tengizchevroil LLP (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Affiliate Statements Captions [Line Items]
Sales and other operating revenues	$ 42,552	$ 23,997	$ 109,745	$ 69,628
Net Income (Loss)	$ 6,115	$ (209)	$ 10,607	(4,905)
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Percentage of affiliate by summarized financial information	100.00%		100.00%
Sales and other operating revenues			$ 10,845	6,757
Costs and other deductions			5,568	4,655
Net Income (Loss)			$ 3,692	$ 1,483
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Equity ownership, percentage	50.00%		50.00%

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