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Fresh Start Accounting - Enterprise Value Reconciliation (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
Plus: Current liabilities 2,510 1,582 3,094  
Plus: Asset retirement obligations (non-current portion)   236    
Plus: Other non-current liabilities   7    
Assets $ 7,326 6,814 $ 6,584  
Restricted cash   86    
Fresh Start Adjustments        
Reorganization, Chapter 11 [Line Items]        
Plus: Cash and cash equivalents   48    
Plus: Current liabilities   0    
Plus: Asset retirement obligations (non-current portion)   97    
Plus: Other non-current liabilities   97    
Assets   359    
Restricted cash   $ 8