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Fresh Start Accounting - Changes in Accounts Payable (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Feb. 09, 2021
Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]      
Net impact to accounts payable $ 257 $ 415 $ 346
Reorganization Adjustments      
Reorganization, Chapter 11 [Line Items]      
Accrual of professional service provider success fees   38  
Accrual of convenience claim distribution reserve   10  
Accrual of professional service provider fees   5  
Reinstatement of accounts payable from liabilities subject to compromise   2  
Payment of professional fees   (31)  
Net impact to accounts payable   $ 24