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Fresh Start Accounting - Additional Information (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Feb. 09, 2021
Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]      
Assets $ 7,326 $ 6,814 $ 6,584
Liabilities 4,288 3,228 11,925
Liabilities and Equity 7,326 6,814 $ 6,584
Enterprise value   4,851  
Predecessor      
Reorganization, Chapter 11 [Line Items]      
Assets   6,595  
Liabilities   13,175  
Liabilities and Equity   6,595  
Fresh Start Adjustments      
Reorganization, Chapter 11 [Line Items]      
Assets   359  
Liabilities   149  
Liabilities and Equity $ 201 359  
Minimum | Fresh Start Adjustments      
Reorganization, Chapter 11 [Line Items]      
Assets   3,500  
Liabilities and Equity   $ 3,500  
Maximum      
Reorganization, Chapter 11 [Line Items]      
Percent of voting shares received by holders   50.00%  
Maximum | Fresh Start Adjustments      
Reorganization, Chapter 11 [Line Items]      
Assets   $ 4,900  
Liabilities and Equity   $ 4,900