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Fresh Start Accounting - Successor’s Equity (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Feb. 09, 2021
Dec. 31, 2020
Sep. 30, 2020
Reorganization, Chapter 11 [Line Items]        
Enterprise Value   $ 4,851    
Plus: Cash and cash equivalents $ 849 40 $ 279 $ 306
Less: Fair value of debt   (1,313)    
Successor equity value 3,038 3,586 $ (5,341)  
Restricted cash   86    
Fresh Start Adjustments        
Reorganization, Chapter 11 [Line Items]        
Plus: Cash and cash equivalents   48    
Less: Fair value of debt $ 52 (52)    
Successor equity value   210    
Restricted cash   $ 8