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Reorganization and Fresh Start Accounting - Reorganization Adjustments, Liabilities subject to Compromise Settled or Reinstated (Details) - USD ($)
$ in Thousands
1 Months Ended
Feb. 05, 2021
Mar. 31, 2021
Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]      
Total consolidated liabilities subject to compromise $ 0 $ 0 $ 4,239,643
Issuance of Successor common stock (854,909)    
Issuance of Successor warrants to certain Predecessor creditors (141,029)    
Payment of the pre-petition revolving credit facility principal and accrued interest (550,020)    
Payment of Paragon litigation settlement from escrow (7,700)    
Reinstatement of Transocean litigation liability (8,000)    
Reinstatement of protection and indemnity insurance liabilities (11,791)    
Reinstatement of trade payables and right-of-use lease liabilities (14,216)    
Gain on settlement of liabilities subject to compromise 2,556,147    
Predecessor      
Reorganization, Chapter 11 [Line Items]      
Accrued and unpaid interest 110,300    
Protection and indemnity insurance liabilities 25,669    
Accounts payable and other payables 8,163    
Estimated loss on litigation 15,700    
Lease liabilities 6,054    
Total consolidated liabilities subject to compromise 4,143,812    
4.900% Senior Notes due August 2020 | Senior Unsecured Notes      
Reorganization, Chapter 11 [Line Items]      
Interest rate, stated percentage   4.90% 4.90%
4.900% Senior Notes due August 2020 | Senior Unsecured Notes | Predecessor      
Reorganization, Chapter 11 [Line Items]      
Debt subject to compromise 62,535    
4.625% Senior Notes due March 2021 | Senior Unsecured Notes      
Reorganization, Chapter 11 [Line Items]      
Interest rate, stated percentage   4.625% 4.625%
4.625% Senior Notes due March 2021 | Senior Unsecured Notes | Predecessor      
Reorganization, Chapter 11 [Line Items]      
Debt subject to compromise 79,937    
3.950% Senior Notes due March 2022 | Senior Unsecured Notes      
Reorganization, Chapter 11 [Line Items]      
Interest rate, stated percentage   3.95% 3.95%
3.950% Senior Notes due March 2022 | Senior Unsecured Notes | Predecessor      
Reorganization, Chapter 11 [Line Items]      
Debt subject to compromise 21,213    
7.750% Senior Notes due January 2024 | Senior Unsecured Notes      
Reorganization, Chapter 11 [Line Items]      
Interest rate, stated percentage   7.75% 7.75%
7.750% Senior Notes due January 2024 | Senior Unsecured Notes | Predecessor      
Reorganization, Chapter 11 [Line Items]      
Debt subject to compromise 397,025    
7.950% Senior Notes due April 2025 | Senior Unsecured Notes      
Reorganization, Chapter 11 [Line Items]      
Interest rate, stated percentage   7.95% 7.95%
7.950% Senior Notes due April 2025 | Senior Unsecured Notes | Predecessor      
Reorganization, Chapter 11 [Line Items]      
Debt subject to compromise 450,000    
7.875% Senior Notes due February 2026 | Senior Unsecured Notes      
Reorganization, Chapter 11 [Line Items]      
Interest rate, stated percentage   7.875% 7.875%
7.875% Senior Notes due February 2026 | Senior Unsecured Notes | Predecessor      
Reorganization, Chapter 11 [Line Items]      
Debt subject to compromise 750,000    
6.200% Senior Notes due August 2040 | Senior Unsecured Notes      
Reorganization, Chapter 11 [Line Items]      
Interest rate, stated percentage   6.20% 6.20%
6.200% Senior Notes due August 2040 | Senior Unsecured Notes | Predecessor      
Reorganization, Chapter 11 [Line Items]      
Debt subject to compromise 393,597    
6.050% Senior Notes due March 2041 | Senior Unsecured Notes      
Reorganization, Chapter 11 [Line Items]      
Interest rate, stated percentage   6.05% 6.05%
6.050% Senior Notes due March 2041 | Senior Unsecured Notes | Predecessor      
Reorganization, Chapter 11 [Line Items]      
Debt subject to compromise 395,000    
5.250% Senior Notes due March 2042 | Senior Unsecured Notes      
Reorganization, Chapter 11 [Line Items]      
Interest rate, stated percentage   5.25% 5.25%
5.250% Senior Notes due March 2042 | Senior Unsecured Notes | Predecessor      
Reorganization, Chapter 11 [Line Items]      
Debt subject to compromise 483,619    
8.950% Senior Notes due April 2045 | Senior Unsecured Notes      
Reorganization, Chapter 11 [Line Items]      
Interest rate, stated percentage   8.95% 8.95%
8.950% Senior Notes due April 2045 | Senior Unsecured Notes | Predecessor      
Reorganization, Chapter 11 [Line Items]      
Debt subject to compromise 400,000    
5.958% Revolving Credit Facility Due January 2023 | Line of Credit | Revolving Credit Facility      
Reorganization, Chapter 11 [Line Items]      
Interest rate, stated percentage     5.958%
5.958% Revolving Credit Facility Due January 2023 | Line of Credit | Revolving Credit Facility | Predecessor      
Reorganization, Chapter 11 [Line Items]      
Debt subject to compromise $ 545,000