Summarized Financial Data - Tengizchevroil LLP (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Affiliate Statements Captions [Line Items]
Sales and other operating revenues	$ 13,494	$ 38,850	$ 44,995	$ 74,050
Net Income (Loss)	$ (8,277)	$ 4,290	$ (4,696)	6,932
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Percentage of affiliate by summarized financial information	100.00%		100.00%
Sales and other operating revenues			$ 4,567	8,369
Costs and other deductions			3,166	4,039
Net Income (Loss)			$ 984	$ 3,039
Tengizchevroil LLP
Affiliate Statements Captions [Line Items]
Equity ownership, percentage	50.00%		50.00%