Fresh Start Accounting - Schedule of Fresh Start Accounting Adjustments (Details) - USD ($) $ in Thousands		4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2020
Reorganization, Chapter 11 [Line Items]
Repayments of Lines of Credit		$ 0	$ 0	$ 0	$ (15,000)
Operating Lease, Right-of-Use Asset			20,500	21,000
Operating Lease, Liability			22,500	23,200
Accrued Liabilities and Other Liabilities	$ 216,500	216,500
Other Liabilities, Noncurrent	565,400	565,400	558,400	515,600
Liabilities Subject to Compromise	0	0			(7,313,700)
Treasury Stock, Value	0	0
Warrants and Rights Outstanding	16,400	16,400	16,400	16,400
Retained Earnings (Accumulated Deficit)	0	0	16,400	(160,100)
Other	90,500	90,500	117,800	148,600
Contract with Customer, Asset, after Allowance for Credit Loss	2,200	2,200	300	5,300	1,800
Other Deferred Costs, Net			26,900	59,100
OTHER ASSETS	165,300	165,300	169,900	171,800
Contract with Customer, Liability, Current			45,800	78,000
Operating Lease, Liability, Current			10,000	9,400
Other liabilities (long-term)	(186,100)	(186,100)	(204,000)	(159,800)
Property, Plant and Equipment, Net	909,100	909,100	890,900	977,200	$ 10,960,500
Accrued liabilities and other			$ 196,200	$ 247,900
Reorganization, Chapter 11, Plan Effect Adjustment
Reorganization, Chapter 11 [Line Items]
Proceeds from Issuance of Debt	500,000
Proceeds from Loans	20,000
Proceeds from Decommissioning Trust Fund Assets	17,600
Repayments of Lines of Credit	(129,900)
Transfer Of Funds To Escrow	(42,700)
Professional Fees	(29,000)
Other Cash	(8,600)
Cash and Cash Equivalents, Period Increase (Decrease)	327,400
Compensation and Benefits Trust	(17,600)	(17,600)
Operating Lease, Right-of-Use Asset	(5,500)	(5,500)
Other Assets, Fair Value Disclosure	13,100	13,100
Other Assets	(10,000)	(10,000)
Accounts Payable, Professional Fees	26,100	26,100
Accounts Payable, Pre-Emergence Professional Fees	(12,600)	(12,600)
Accounts Payable, Other	(400)	(400)
Accounts Payable, Trade	13,100	13,100
Operating Lease, Liability	(5,000)	(5,000)
Accrued Liabilities, Holding Costs	(4,100)	(4,100)
Accrued Liabilities, Restructuring Payments	(3,300)	(3,300)
Accrued Liabilities and Other Liabilities	(12,400)	(12,400)
Liabilities, Construction Contract Intangible Liabilities	(49,900)	(49,900)
Liabilities, Accrued Holding Costs	(4,700)	(4,700)
Liabilities, Lease Liabilities	(600)	(600)
Other Liabilities, Noncurrent	(55,200)	(55,200)
Liabilities Subject to Compromise	7,313,700	7,313,700
Liabilities Subject to Compromise, Payments under Bankruptcy Court Order for Resolutions of Contingencies Subject to Chapter 11	(129,900)
Liabilities Subject to Compromise, Period Increase (Decrease)	6,139,000
Settlement On Liabilities Subject To Compromise	(6,139,000)	(6,139,000)
Issuance of Common Shares for backstop premium	29,100	29,100
Issuance of Common Shares to the Shipyard	5,400	5,400
Write-off of unrecognized share-based compensation expense	16,000	16,000
Professional fees and success fees	35,900	35,900
Backstop Commitment Agreement, Backstop Premium For Retained Deficit	30,000	30,000
Impact of newbuild contract amendments	350,700	350,700
Reorganization Items, Net	(5,671,900)	(5,671,900)
Common shares, value	800	800
Treasury Stock, Value	75,500	75,500
Predecessor Additional Paid In Capital, Adjustment	(7,856,400)	(7,856,400)
Equity Component Of Convertible Notes	(220,000)	(220,000)
Cash And Equity Compensation Plans	(583,600)	(583,600)
Warrants and Rights Outstanding	16,400	16,400
Retained Earnings (Accumulated Deficit)	(14,322,600)	(14,322,600)
Other	1,500	1,500
OTHER ASSETS	(10,000)	(10,000)
Property, Plant and Equipment, Net	(417,600)	(417,600)
Reorganization, Chapter 11, Plan Effect Adjustment | Common Class A And B Shares
Reorganization, Chapter 11 [Line Items]
Common shares, value	(82,600)	(82,600)
Reorganization, Chapter 11, Plan Effect Adjustment | Predecessor Creditors And The Shipyard
Reorganization, Chapter 11 [Line Items]
Liabilities Subject To Compromise, Stock Issued	(721,000)
Reorganization, Chapter 11, Plan Effect Adjustment | Backstop Parties
Reorganization, Chapter 11 [Line Items]
Liabilities Subject To Compromise, Stock Issued	(323,800)
Reorganization, Chapter 11, Fresh-Start Adjustment
Reorganization, Chapter 11 [Line Items]
Operating Lease, Right-of-Use Asset	400	400
Other Assets	(20,700)	(20,700)
Accounts Payable, Trade	(36,800)	(36,800)
Accrued Liabilities and Other Liabilities	(61,800)	(61,800)
Liabilities, Lease Liabilities	(1,100)	(1,100)
Other Liabilities, Noncurrent	(85,600)	(85,600)
Liabilities Subject to Compromise	0	0
Treasury Stock, Value	0	0
Warrants and Rights Outstanding	0	0
Retained Earnings (Accumulated Deficit)	9,175,200	9,175,200
Inventory	(260,800)	(260,800)
Other Asset, Other, Current	(20,300)	(20,300)
Other	(281,100)	(281,100)
Deferred Income Taxes and Other Assets, Noncurrent	21,100	21,100
Contract with Customer, Asset, after Allowance for Credit Loss	8,500	8,500
Deferred Contract Drilling	(16,500)	(16,500)
Other Deferred Costs, Net	(4,600)	(4,600)
OTHER ASSETS	8,900	8,900
Historical Deferred Revenues	(25,900)	(25,900)
Contract with Customer, Liability, Current	500	500
Operating Lease, Liability, Current	400	400
Other liabilities (long-term)	(82,700)	(82,700)
Historical Deferred Revenues, Noncurrent	(5,900)	(5,900)
Deferred Tax Impacts Of Certain Fresh Start Adjustments	1,700	1,700
Other Sundry Liabilities	200	200
Prepaid Expense and Other Assets, Current	(281,100)	(281,100)
Property, Plant and Equipment, Net	(8,699,700)	(8,699,700)
Intangible Assets, Net (Excluding Goodwill)	8,500	8,500
Equity Method Investments	(43,400)	(43,400)
Accounts and Financing Receivable, after Allowance for Credit Loss	(214,400)	(214,400)
Accrued liabilities and other	62,800	62,800
Intangible Liabilities Noncurrent	(500)	(500)
Other Sundry Liabilities, Noncurrent	87,300	87,300
Predecessor, Accumulated Other Comprehensive Loss	(93,400)	(93,400)
Loss On Fresh-Start Adjustments	(9,194,600)	(9,194,600)
Tax Impact Of Fresh Start Adjustments	$ 19,400	$ 19,400