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Fresh Start Accounting - Reorganization Value (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 12, 2019
Fresh-Start Adjustment [Line Items]    
Enterprise value   $ 4,516
Cash and cash equivalents and other   518
Fair value of term loan   (2,103)
Fair value of successor stockholders’ equity   2,931
Current liabilities   1,707
Non-current liabilities excluding long-term debt   627
Reorganization value of successor assets   7,368
Minimum    
Fresh-Start Adjustment [Line Items]    
Enterprise value   $ 4,500
Incremental borrowing rate   8.45%
Hypothetical royalty savings percentage 1.00%  
Discount rate 12.80%  
Minimum | Trade Names    
Fresh-Start Adjustment [Line Items]    
Hypothetical royalty savings percentage 1.50%  
Maximum    
Fresh-Start Adjustment [Line Items]    
Enterprise value   $ 6,000
Incremental borrowing rate   10.35%
Hypothetical royalty savings percentage 7.00%  
Discount rate 16.00%  
Maximum | Trade Names    
Fresh-Start Adjustment [Line Items]    
Hypothetical royalty savings percentage 2.00%  
Fresh Start Adjustments    
Fresh-Start Adjustment [Line Items]    
Elimination of deferred revenue   $ (29)