Summarized Financial Data - Tengizchevroil LLP (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Affiliate Statements Captions [Line Items]
Sales and other operating revenues	$ 23,997	$ 34,779	$ 69,628	$ 105,291
Net Income (Loss)	$ (209)	$ 2,580	$ (4,905)	9,512
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Percentage of affiliate by summarized financial information	100.00%		100.00%
Sales and other operating revenues			$ 6,757	11,991
Costs and other deductions			4,655	5,971
Net Income (Loss)			$ 1,483	$ 4,230
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Equity ownership, percentage	50.00%		50.00%