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Credit risk - Concentration Risk (Details) - Customer Concentration Risk
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Purchaser A | Oil, NGL, and Natural Gas Sales      
Concentration Risk [Line Items]      
Concentration risk (as a percent) 29.00% 33.00% 59.00%
Purchaser A | Purchased Oil Sales      
Concentration Risk [Line Items]      
Concentration risk (as a percent) 47.00% 69.00% 26.00%
Purchaser B | Oil, NGL, and Natural Gas Sales      
Concentration Risk [Line Items]      
Concentration risk (as a percent) 24.00% 24.00% 18.00%
Purchaser B | Purchased Oil Sales      
Concentration Risk [Line Items]      
Concentration risk (as a percent) 31.00% 16.00% 70.00%
Purchaser C | Oil, NGL, and Natural Gas Sales      
Concentration Risk [Line Items]      
Concentration risk (as a percent) 17.00% 14.00%  
Purchaser C | Purchased Oil Sales      
Concentration Risk [Line Items]      
Concentration risk (as a percent) 22.00% 14.00%  
Purchaser D | Oil, NGL, and Natural Gas Sales      
Concentration Risk [Line Items]      
Concentration risk (as a percent)   10.00%  
Purchaser E | Oil, NGL, and Natural Gas Sales      
Concentration Risk [Line Items]      
Concentration risk (as a percent)     15.00%
Purchaser F | Oil, NGL, and Natural Gas Sales      
Concentration Risk [Line Items]      
Concentration risk (as a percent) 14.00%