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Subsequent Events (Details)
$ in Millions
3 Months Ended
Apr. 30, 2021
USD ($)
a
Mar. 31, 2021
Boe
Apr. 13, 2021
USD ($)
Little Knife and Murphy Creek | Disposed of by Sale      
Subsequent Event [Line Items]      
Net production from acreage sold | Boe   4,500  
Subsequent Event | Little Knife and Murphy Creek | Disposed of by Sale      
Subsequent Event [Line Items]      
Consideration received from the sale of working interests in oil and gas properties $ 312    
Developed and undeveloped acreage sold | a 78,700    
Subsequent Event | Hess Corp Revolving Credit Facility      
Subsequent Event [Line Items]      
Line of credit facility, maximum borrowing capacity     $ 3,500