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FRESH START ACCOUNTING - Reconciliation of Enterprise Value to Estimated Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Oct. 31, 2020
Oct. 27, 2020
Reorganizations [Abstract]      
Fair value of total equity upon emergence $ 1,345 $ 1,345  
Fair value of long-term debt 725 723  
Fair value of asset retirement obligations 593    
Less: Unrestricted cash (163)    
Enterprise value 2,500 2,500  
Add: Unrestricted cash   163  
Add: Current liabilities   396  
Add: Other long-term liabilities   231  
Less: Other   (2)  
Reorganization value   $ 3,288  
Cash used temporarily $ 118   $ 118
Current liabilities     50
Other long-term Liabilities     $ 543