Fresh Start Accounting - Reorganization Adjustments, Liabilities subject to Compromise Settled or Reinstated (Details) $ in Thousands		1 Months Ended
Feb. 05, 2021 USD ($)	Feb. 05, 2021 USD ($)
Reorganization, Chapter 11 [Line Items]
Total consolidated liabilities subject to compromise	$ 0	$ 0
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	2,556,147
Predecessor
Reorganization, Chapter 11 [Line Items]
Accrued and unpaid interest	110,300	110,300
Protection and indemnity insurance liabilities	25,669	25,669
Accounts payable and other payables	8,163	8,163
Estimated loss on litigation	15,700	15,700
Lease liabilities	6,054	6,054
Total consolidated liabilities subject to compromise	$ 4,143,812	$ 4,143,812
4.900% Senior Notes due August 2020 \| Senior Notes
Reorganization, Chapter 11 [Line Items]
Interest rate on senior notes	4.90%	4.90%
4.900% Senior Notes due August 2020 \| Senior Notes \| Predecessor
Reorganization, Chapter 11 [Line Items]
Debt subject to compromise	$ 62,535	$ 62,535
4.625% Senior Notes due March 2021 \| Senior Notes
Reorganization, Chapter 11 [Line Items]
Interest rate on senior notes	4.625%	4.625%
4.625% Senior Notes due March 2021 \| Senior Notes \| Predecessor
Reorganization, Chapter 11 [Line Items]
Debt subject to compromise	$ 79,937	$ 79,937
3.950% Senior Notes due March 2022 \| Senior Notes
Reorganization, Chapter 11 [Line Items]
Interest rate on senior notes	3.95%	3.95%
3.950% Senior Notes due March 2022 \| Senior Notes \| Predecessor
Reorganization, Chapter 11 [Line Items]
Debt subject to compromise	$ 21,213	$ 21,213
7.750% senior notes due Jan. 2024 \| Senior Notes
Reorganization, Chapter 11 [Line Items]
Interest rate on senior notes	7.75%	7.75%
7.750% senior notes due Jan. 2024 \| Senior Notes \| Predecessor
Reorganization, Chapter 11 [Line Items]
Debt subject to compromise	$ 397,025	$ 397,025
7.950% Senior Notes due April 2025 \| Senior Notes
Reorganization, Chapter 11 [Line Items]
Interest rate on senior notes	7.95%	7.95%
7.950% Senior Notes due April 2025 \| Senior Notes \| Predecessor
Reorganization, Chapter 11 [Line Items]
Debt subject to compromise	$ 450,000	$ 450,000
7.875% Senior Notes due February 2026 \| Senior Notes
Reorganization, Chapter 11 [Line Items]
Interest rate on senior notes	7.875%	7.875%
7.875% Senior Notes due February 2026 \| Senior Notes \| Predecessor
Reorganization, Chapter 11 [Line Items]
Debt subject to compromise	$ 750,000	$ 750,000
6.200% Senior Notes due August 2040 \| Senior Notes
Reorganization, Chapter 11 [Line Items]
Interest rate on senior notes	6.20%	6.20%
6.200% Senior Notes due August 2040 \| Senior Notes \| Predecessor
Reorganization, Chapter 11 [Line Items]
Debt subject to compromise	$ 393,597	$ 393,597
6.050% Senior Notes due March 2041 \| Senior Notes
Reorganization, Chapter 11 [Line Items]
Interest rate on senior notes	6.05%	6.05%
6.050% Senior Notes due March 2041 \| Senior Notes \| Predecessor
Reorganization, Chapter 11 [Line Items]
Debt subject to compromise	$ 395,000	$ 395,000
5.250% Senior Notes due March 2042 \| Senior Notes
Reorganization, Chapter 11 [Line Items]
Interest rate on senior notes	5.25%	5.25%
5.250% Senior Notes due March 2042 \| Senior Notes \| Predecessor
Reorganization, Chapter 11 [Line Items]
Debt subject to compromise	$ 483,619	$ 483,619
8.950% Senior Notes due April 2045 \| Senior Notes
Reorganization, Chapter 11 [Line Items]
Interest rate on senior notes	8.95%	8.95%
8.950% Senior Notes due April 2045 \| Senior Notes \| Predecessor
Reorganization, Chapter 11 [Line Items]
Debt subject to compromise	$ 400,000	$ 400,000
5.958% revolving credit facility maturing Jan. 2023 \| Line of Credit \| Revolving Credit Facility
Reorganization, Chapter 11 [Line Items]
Interest rate on senior notes	5.958%	5.958%
5.958% revolving credit facility maturing Jan. 2023 \| Line of Credit \| Revolving Credit Facility \| Predecessor
Reorganization, Chapter 11 [Line Items]
Debt subject to compromise	$ 545,000	$ 545,000

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