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Subsequent Events (Details)
shares in Thousands, bbl in Thousands, MMBbls in Millions, $ in Millions
1 Months Ended 2 Months Ended 9 Months Ended
Oct. 31, 2021
USD ($)
bbl
$ / bbl
shares
Mar. 31, 2021
USD ($)
shares
Oct. 07, 2021
Sep. 30, 2021
USD ($)
MMBbls
Sep. 30, 2020
USD ($)
Oct. 04, 2021
bbl
Dec. 31, 2020
MMBbls
Subsequent Event [Line Items]              
Proceeds from sale of Class A shares of Hess Midstream LP | $   $ 70   $ 70 $ 0    
Number of Class A shares of subsidiary public offering (in shares) | shares   3,450          
Commodity Options / Collars              
Subsequent Event [Line Items]              
Notional amount of crude oil | MMBbls       54.0     27.4
Subsequent Event              
Subsequent Event [Line Items]              
Proceeds from sale of Class A shares of Hess Midstream LP | $ $ 108            
Number of Class A shares of subsidiary public offering (in shares) | shares 4,300            
Percent interest in consolidated entity 44.00%   45.00%        
Subsequent Event | Commodity Options / Collars | West Texas Intermediate              
Subsequent Event [Line Items]              
Notional amount of crude oil | bbl 90         10  
Average monthly floor price (US dollar per barrel) 60            
Average monthly ceiling price (US dollar per barrel) 90            
Subsequent Event | Commodity Options / Collars | Brent              
Subsequent Event [Line Items]              
Notional amount of crude oil | bbl 60         30  
Average monthly floor price (US dollar per barrel) 65            
Average monthly ceiling price (US dollar per barrel) 95