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Chapter 11 Proceedings and Ability to Continue as a Going Concern - Narrative (Details) - USD ($)
 4 Months Ended 12 Months Ended
Apr. 30, 2021
Apr. 30, 2021
Dec. 31, 2023
Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]        
Contractual interest expense   $ 132,900,000    
Debtor Reorganization Items, Discharge of Claims and Liabilities $ 7,100,000,000      
Plan Of Reorganization, Percent Of Subscription Rights 97.60%      
Class of Warrant or Right, Outstanding 5,600,000 5,600,000 5,470,950  
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 131.88 $ 131.88    
Warranted, Period Exercisable     7 years  
Debtor-in-Possession Financing, Borrowings Outstanding     $ 0  
Liabilities Subject To Compromise, Accrued Interest On Notes       $ 203,500,000
Revolving Credit Facility [Member]        
Restructuring Cost and Reserve [Line Items]        
Liabilities Subject To Compromise, Long-term Debt       581,000,000
Management Incentive Plan        
Restructuring Cost and Reserve [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 9,000,000 9,000,000    
Senior Noteholders [Member]        
Restructuring Cost and Reserve [Line Items]        
Plan Of Reorganization, Pro Rata Share Percentage 38.48%      
Plan Of Reorganization, Securities Issued 28,900,000      
Lenders under Revolving Credit Facility Participating in Rights Offering [Member]        
Restructuring Cost and Reserve [Line Items]        
Plan Of Reorganization, Pro Rata Share Percentage 0.70%      
Plan Of Reorganization, Securities Issued 500,000      
Lenders Under Revolving Credit Facility Not Participating in Rights Offering [Member]        
Restructuring Cost and Reserve [Line Items]        
Plan Of Reorganization, Pro Rata Share Percentage 22.98%      
Debtor-in-Possession Financing, Amount Arranged $ 96,100,000 $ 96,100,000    
Plan Of Reorganization, Securities Issued 17,200,000      
Senior Noteholders Who Agreed To Backstop The Rights Offering [Member]        
Restructuring Cost and Reserve [Line Items]        
Plan Of Reorganization, Pro Rata Share Percentage 2.63%      
Debtor-in-Possession Financing, Amount Arranged $ 48,800,000 48,800,000    
Plan Of Reorganization, Securities Issued 2,000,000      
Senior Noteholders Participating In Rights Offering [Member]        
Restructuring Cost and Reserve [Line Items]        
Plan Of Reorganization, Pro Rata Share Percentage 29.30%      
Plan Of Reorganization, Securities Issued 22,000,000      
Lenders Under Revolving Credit Facility Who Agreed to Backstop The Rights Offering [Member]        
Restructuring Cost and Reserve [Line Items]        
Plan Of Reorganization, Pro Rata Share Percentage 0.07%      
Debtor-in-Possession Financing, Amount Arranged $ 1,200,000 1,200,000    
Plan Of Reorganization, Securities Issued 49,500      
Two RCF Lendors Participating In The Rights Offering        
Restructuring Cost and Reserve [Line Items]        
Plan Of Reorganization, Pro Rata Share Percentage 5.30%      
Debtor-in-Possession Financing, Amount Arranged $ 7,800,000 7,800,000    
Plan Of Reorganization, Securities Issued 4,000,000      
Daewoo Shipbuilding & Marine Engineering Co., Ltd.        
Restructuring Cost and Reserve [Line Items]        
Debtor-in-Possession Financing, Amount Arranged $ 5,000,000 $ 5,000,000    
Plan Of Reorganization, Securities Issued 400,000      
First Lien Notes | Two RCF Lendors Participating In The Rights Offering        
Restructuring Cost and Reserve [Line Items]        
Plan Of Reorganization, Pro Rata Share Percentage 2.427%      
Senior Notes [Member]        
Restructuring Cost and Reserve [Line Items]        
Debtor-in-Possession Financing, Cash Payment $ 26,000,000      
Liabilities Subject To Compromise, Long-term Debt       $ 6,500,000,000
Senior Notes [Member] | Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty Member        
Restructuring Cost and Reserve [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding 6.875% 6.875%    
Senior Notes [Member] | Seven Point Eight Seven Five Percent Senior Notes Due Twenty Forty [Member]        
Restructuring Cost and Reserve [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding 7.875% 7.875%    
Senior Notes [Member] | Four Point Eight Seven Five Percent Senior Notes Due Twenty Twenty Two [Member]        
Restructuring Cost and Reserve [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding 4.875% 4.875%    
Senior Notes [Member] | Four Point Seven Five Percent Senior Notes Due Twenty Twenty Four [Member]        
Restructuring Cost and Reserve [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding 4.75% 4.75%    
Senior Notes [Member] | Seven Point Three Seven Five Senior Notes Due Twenty Twenty Five [Member]        
Restructuring Cost and Reserve [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding 7.375% 7.375%    
Senior Notes [Member] | Five Point Four Zero Percent Senior Notes Due Twenty Forty Two [Member]        
Restructuring Cost and Reserve [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding 5.40% 5.40%    
Senior Notes [Member] | Five Point Eight Five Percent Senior Notes Due Twenty Forty Four [Member]        
Restructuring Cost and Reserve [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding 5.85% 5.85%    
Senior Notes [Member] | First Lien Notes        
Restructuring Cost and Reserve [Line Items]        
Debtor-in-Possession Financing, Amount Arranged $ 520,000,000 $ 520,000,000    
Debt Instrument, Face Amount $ 550,000,000 $ 550,000,000    
Senior Notes [Member] | Seven Point Two Zero Debenture Due Twenty Twenty Seven        
Restructuring Cost and Reserve [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding 7.20% 7.20%