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Subsequent Events (Details) - USD ($)
$ in Millions
6 Months Ended
Jul. 09, 2021
Jul. 02, 2021
Jun. 30, 2021
Jun. 30, 2020
Jul. 24, 2021
Jan. 15, 2021
Subsequent Event [Line Items]            
Gain on disposals     $ 11 $ 0    
Secured debt | Senior Secured Notes            
Subsequent Event [Line Items]            
Interest rate           12.00%
Subsequent event            
Subsequent Event [Line Items]            
Plan of reorganization, new financing raised         $ 350  
Plan of reorganization, reduction of liabilities         $ 4,900  
Principal noteholders approving amendments 80.00%          
Subsequent event | West Freedom            
Subsequent Event [Line Items]            
Gain on disposals   $ 5