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Basis of Presentation (Restructuring Measures) (Details Textuals)
$ in Millions
1 Months Ended
Mar. 31, 2020
$ / Barrel
Jul. 31, 2020
$ / Barrel
Jul. 28, 2020
Jun. 30, 2020
USD ($)
bbl / d
Derivative [Line Items]        
Average price | $ / Barrel 20      
Reduction in Capital Budget       $ 80
Percentage Reduction In Capital Budget       44.00%
Percent of hedges restructured       50.00%
Volume of hedges restructured | bbl / d       14,500
Percentage of hedges consisting of fixed-price swaps       50.00%
Q3-Q4        
Derivative [Line Items]        
Volume per day | bbl / d       35,500
Minimum        
Derivative [Line Items]        
Budgeted annual capital expenditures       $ 95
Maximum        
Derivative [Line Items]        
Budgeted annual capital expenditures       105
Subsequent Event        
Derivative [Line Items]        
Average price | $ / Barrel   40    
Senior secured, convertible senior, and senior unsecured debt        
Derivative [Line Items]        
Outstanding debt principal balance       $ 2,100
Lenders Under Credit Facility | Subsequent Event        
Derivative [Line Items]        
Consenting percentage     100.00%  
Second Lien Note Holders | Subsequent Event        
Derivative [Line Items]        
Consenting percentage     67.10%  
Convertible Note Holders | Subsequent Event        
Derivative [Line Items]        
Consenting percentage     73.10%