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Derivatives - Narrative (Details)
1 Months Ended 2 Months Ended 9 Months Ended 10 Months Ended 12 Months Ended
May 31, 2018
USD ($)
Feb. 28, 2017
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
derivative_asset_instrument
Dec. 31, 2020
$ / bbl
MBbls
Dec. 31, 2019
$ / bbl
MBbls
Dec. 31, 2018
$ / bbl
MBbls
Dec. 31, 2016
USD ($)
Derivative [Line Items]                
Gross fair value of derivative assets       $ 0        
Number of derivative asset instruments held | derivative_asset_instrument       0        
Net cash settlements received       $ 3,000,000        
Period of target exposure coverage     2 years          
Purchased put options premium     $ 20,000,000          
Derivative termination deferred costs $ 127,000,000              
Predecessor                
Derivative [Line Items]                
Net cash settlements received   $ 500,000           $ 10,000,000
Brent oil swaps from July 2018 through March 2019 | Scenario, Forecast                
Derivative [Line Items]                
Hedged volume (MBbls) | MBbls           900 1,800  
Weighted-average price ($/Bbl) | $ / bbl           75.66 75.66  
Brent oil purchased put options for January 2019 through March 2020 | Scenario, Forecast                
Derivative [Line Items]                
Hedged volume (MBbls) | MBbls         500 2,800    
Weighted average floor price ($/Bbls) | $ / bbl         65.00 65.00