Document and Entity Information Document Information [Table] Document Information [Line Items] Document and Entity Information Document Type Document Quarterly Report Document Period End Date Current Fiscal Year End Date Document Transition Report Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, City or Town Entity Address, Country Entity Address, Postal Zip Code City Area Code Local Phone Number Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Central Index Key Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Title of 12(b) Security Trading Symbol Security Exchange Name CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS Statement [Table] Statement [Line Items] Statement Operating Income (Loss) [Abstract] Operating revenues Revenue from Contract with Customer, Excluding Assessed Tax Contract drilling revenues Revenue from Contract with Customer, Product and Service [Extensible List] Costs and Expenses [Abstract] Costs and expenses Cost of Goods and Services Sold Operating and maintenance Cost, Product and Service [Extensible List] Depreciation, Depletion and Amortization Depreciation and amortization General and Administrative Expense. General and administrative Costs and Expenses Total costs and expenses Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property (Gain) loss on disposal of assets, net Gain (loss) on disposal of assets, net Gain (loss) on the sale of assets Operating Income (Loss) Operating loss Nonoperating Income (Expense) [Abstract] Other income (expense), net Investment Income, Interest Interest income Interest Expense Interest expense, net of amounts capitalized Gains (Losses) on Extinguishment of Debt Loss on retirement of debt Aggregate net loss Loss on retirement of debt Other Nonoperating Income (Expense) Other, net Nonoperating Income (Expense) Total other income (expense), net Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Loss before income tax expense Income Tax Expense (Benefit) Income tax expense Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss Net loss Net loss Net Income (Loss) Attributable to Parent Net loss attributable to controlling interest Net loss attributable to controlling interest Earnings Per Share, Basic Loss per share, basic (in dollars per share) Earnings Per Share, Diluted Loss per share, diluted (in dollars per share) Weighted Average Number of Shares Outstanding, Basic Weighted-average shares for per share calculation, basic (in shares) Weighted-average shares, basic (in shares) Weighted Average Number of Shares Outstanding, Diluted Weighted-average shares for per share calculation, diluted (in shares) Weighted-average shares, diluted (in shares) CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments and Tax Components of net periodic benefit costs before reclassifications Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax Components of net periodic benefit costs reclassified to net loss Other Comprehensive Income (Loss), before Tax Other comprehensive loss before income taxes Other Comprehensive Income (Loss), Net of Tax Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other comprehensive income (loss) attributable to controlling interest Other comprehensive loss attributable to controlling interest Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Total comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive loss attributable to controlling interest Total comprehensive loss attributable to controlling interest CONDENSED CONSOLIDATED BALANCE SHEETS Assets [Abstract] Assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Receivables, Net, Current Accounts receivable, net of allowance of $2 at March 31, 2023 and December 31, 2022 Prepaid Supplies Materials and supplies, net of allowance of $201 and $199 at March 31, 2023 and December 31, 2022, respectively Restricted Cash and Investments, Current Restricted cash and cash equivalents Other Assets, Current Other current assets Assets, Current Total current assets Property, Plant and Equipment, Gross Property and equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less accumulated depreciation Property, Plant and Equipment, Net Property and equipment, net Finite-Lived Intangible Assets, Net Contract intangible assets Deferred Income Tax Assets, Net Deferred tax assets, net Other Assets, Noncurrent Other assets Assets Total assets Liabilities and Equity [Abstract] Liabilities and equity Accounts Payable, Current Accounts payable Accrued Income Taxes, Current Accrued income taxes Debt Current Debt due within one year Other Liabilities, Current Other current liabilities Liabilities, Current Total current liabilities Long-term Debt and Capital Lease Obligations Long-term debt Deferred Income Tax Liabilities, Net Deferred tax liabilities, net Other Liabilities, Noncurrent Other long-term liabilities Liabilities, Noncurrent Total long-term liabilities Commitments and Contingencies. Commitments and contingencies Common Stock, Value, Issued Shares, CHF 0.10 par value, 905,094,091 authorized, 142,362,093 conditionally authorized, 797,245,335 issued and 731,847,899 outstanding at March 31, 2023, and 905,093,509 authorized, 142,362,675 conditionally authorized, 797,244,753 issued and 721,888,427 outstanding at December 31, 2022 Additional Paid in Capital Additional paid-in capital Retained Earnings (Accumulated Deficit). Accumulated deficit Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Stockholders' Equity Attributable to Parent Total controlling interest shareholders' equity Stockholders' Equity Attributable to Noncontrolling Interest Noncontrolling interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Balance Balance Total equity Liabilities and Equity Total liabilities and equity Allowance for Doubtful Accounts Receivable, Current Allowance for doubtful accounts Inventory Valuation Reserves Materials and supplies, allowance for obsolescence Common Stock, Par or Stated Value Per Share Shares, CHF par value (in Swiss francs per share) Common Stock, Shares Authorized Shares, authorized Conditional capital represents the amount of additional registered shares that the board is authorized to issue without obtaining additional shareholder approval. Shares Conditionally Authorized Shares, conditionally authorized Common Stock, Shares, Issued Shares, issued Common Stock, Shares, Outstanding Shares, outstanding CONDENSED CONSOLIDATED STATEMENTS OF EQUITY Equity Components [Axis] Equity Component [Domain] Total controlling interest shareholders' equity Shares Additional paid-in capital Accumulated deficit Accumulated other comprehensive loss Noncontrolling interest Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Shareholders' Equity The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent and is not considered redeemable or temporary. Such redeemable or temporary interest is classified outside of permanent equity. Comprehensive Income Net of Tax Including Portion Attributable to Noncontrolling Interest 1 Total comprehensive loss Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Share-based compensation Stock Issued During Period, Value, New Issues Issuance of shares Stock Issued During Period, Shares, New Issues Issuance of shares (in shares) CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile to net cash used in operating activities: Amortization Contract intangible asset amortization Share-based Compensation. Share-based compensation expense Unrealized Gain (Loss) on Derivatives Fair value adjustment to bifurcated compound exchange feature Deferred Income Tax Expense (Benefit) Deferred income tax expense Other Noncash Income (Expense) Other, net Increase (Decrease) in Deferred Revenue Changes in deferred revenues, net Increase (Decrease) in Deferred Charges Changes in deferred costs, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Changes in other operating assets and liabilities, net Net Cash Provided by (Used in) Operating Activities Net cash used in operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities Payments to Acquire Property, Plant, and Equipment Capital expenditures Total capital expenditures Aggregate cash payment to acquire property Payments to Acquire Interest in Subsidiaries and Affiliates Investments in equity of unconsolidated affiliates Proceeds from Sale of Property, Plant, and Equipment Proceeds from disposal of assets, net Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities Repayments of Long-term Debt Repayments of debt Repayments of debt Proceeds from Issuance of Long-term Debt Proceeds from issuance of debt, net of issue costs Proceeds from issuance of debt Proceeds from Issuance of Common Stock Proceeds from issuance of shares, net of issue costs Proceeds from (Payments for) Other Financing Activities Other, net Net Cash Provided by (Used in) Financing Activities Net cash provided by (used in) financing activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net decrease in unrestricted and restricted cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Unrestricted and restricted cash and cash equivalents, end of period Unrestricted and restricted cash and cash equivalents, beginning of period Business Nature of Operations [Text Block] Business Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Significant Accounting Policies Unconsolidated Affiliates Equity Method Investments and Joint Ventures Disclosure [Text Block] Unconsolidated Affiliates Revenues Revenue from Contract with Customer [Text Block] Revenues Long-Lived Assets The entire disclosure for long-lived assets including property and equipment and right-of-use assets used in normal conduct of business and not intended for resale. Long-Lived Assets Disclosure [Text Block] Long -Lived Assets Debt Debt Disclosure [Text Block] Debt Income Taxes Income Tax Disclosure [Text Block] Income Taxes Loss per share Earnings Per Share [Text Block] Loss per share Contingencies Commitments and Contingencies Disclosure [Text Block] Contingencies Equity Stockholders' Equity Note Disclosure [Text Block] Equity Financial Instruments Fair Value Disclosures [Text Block] Financial Instruments Basis of Accounting, Policy [Policy Text Block] Presentation Use of Estimates, Policy [Policy Text Block] Accounting estimates Fair Value of Financial Instruments, Policy [Policy Text Block] Fair value measurements Disaggregation of Revenue [Table Text Block] Schedule of revenue disaggregation Contract with Customer, Asset and Liability [Table Text Block] Schedule of contract balances and changes Disclosure of actual capital expenditures and other capital additions, including capitalized interest, for remaining major construction projects. Actual Capital Expenditures and Other Capital Additions Including Capitalized Interest [Table Text Block] Changes in our construction work in progress, including capital expenditures and capitalized interest Creditor [Axis] Troubled Debt Restructuring, Debtor, Current Period, Creditor [Domain] Represents the exchange of debt. Exchanged Schedule of Debt [Table Text Block] Schedule of debt Schedule of Maturities of Long-term Debt [Table Text Block] Scheduled maturities of debt Schedule of Extinguishment of Debt [Table Text Block] Schedule of debt retirements Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of loss per share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of antidilutive securities Fair Value, by Balance Sheet Grouping [Table Text Block] Carrying amounts and fair values of the financial instruments Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Represents information related to the ultra-deepwater floaters asset group. Ultra-deepwater floaters Represents information related to the harsh environment floaters asset group. Harsh environment floaters Represent information pertaining to ultra deep water drill ships. Ultra Deepwater drillships Number of mobile offshore drilling units. Number of Mobile Offshore Drilling Units Number of mobile offshore drilling units Number of mobile offshore drilling units under construction we own, had partial ownership interests in or operated at the measurement date. Number of Mobile Offshore Drilling Units Under Construction Number of mobile offshore drilling units under construction Number of mobile offshore drilling units that a company is constructing that the entity holds a noncontrolling ownership interest in. Number of mobile offshore drilling units under construction, noncontrolling interest Number of mobile offshore drilling units under construction, noncontrolling interest Schedule of Equity Method Investments [Table] Investment, Name [Axis] Investment, Name [Domain] Represents information related to Global Sea Mineral Resources, a Belgian company and leading developer of nodule collection technology. Global Sea Mineral Resources