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Summarized Financial Data - Tengizchevroil LLP (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Affiliate Statements Captions [Line Items]
Sales and other operating revenues	$ 31,076	$ 29,705
Net Income (Loss)	$ 1,398	3,581
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Percentage of affiliate by summarized financial information	100.00%
Sales and other operating revenues	$ 3,431	3,296
Costs and other deductions	1,856	1,957
Net Income (Loss)	$ 1,012	$ 938
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Equity ownership, percentage	50.00%

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