Cash held in escrow Cash Held In Escrow [Member] Cash Pledged As Collateral, Senior Secured Notes [Member] Range [Domain] Statistical Measurement [Domain] Restricted cash Restricted Cash, Current Award Timing Predetermined Award Timing Predetermined [Flag] Related Party Transaction [Axis] Related Party Transaction [Axis] Entity File Number Entity File Number Additional paid-in capital Additional Paid-in Capital [Member] Equity in earnings of equity method investment (net of tax) Equity in earnings of equity method investment (net of tax) Income (Loss) from Equity Method Investments Tabular List, Table Tabular List [Table Text Block] Basic loss per share: Earnings Per Share, Basic [Abstract] Significant accounting policies New Accounting Pronouncements, Policy [Policy Text Block] Schedule of related party transactions Schedule of Related Party Transactions [Table Text Block] Trade accounts payable Increase (Decrease) in Accounts Payable Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Schedule of fair value of financial instruments measured at amortized cost Fair Value, by Balance Sheet Grouping [Table Text Block] Guarantor obligations, maximum exposure, undiscounted Guarantor Obligations, Maximum Exposure, Undiscounted Shares withheld for taxes on equity transactions Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Measurement Basis [Axis] Measurement Basis [Axis] Basic (LPS)/EPS (in usd per share) Basic loss per share (in usd per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Related party transactions Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Amounts due from related parties, net Other Assets, Miscellaneous, Current Revenue from contracts with customers Revenue from Contract with Customer [Text Block] Other Liabilities [Abstract] Other Liabilities [Abstract] Vesting of restricted stock units (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Adjustment to Compensation, Amount Adjustment to Compensation Amount Concentration risk percentage Concentration Risk, Percentage Drilling units, net of accumulated depreciation of 754 as of March 31, 2026 (December 31, 2025: 682) Drilling Units, Net Amount, net of accumulated depreciation, of drilling units used in the normal conduct of business and not intended for resale. Other assets Increase (Decrease) in Other Operating Assets Share based compensation expense Share-Based Payment Arrangement, Noncash Expense Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Total shareholders' equity Beginning balance Ending balance Equity, Attributable to Parent Insider Trading Policies and Procedures [Line Items] Common shares, authorized (in shares) Common Stock, Shares Authorized Surety Bond Surety Bond [Member] Tax Period [Domain] Tax Period [Domain] Current assets Assets, Current [Abstract] Damages paid Loss Contingency, Damages Paid, Value Total liabilities and shareholders' equity Liabilities and Equity Management fee received Related Party Transaction, Management Fee Received Related Party Transaction, Management Fee Received Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Financial and other non-operating items Other Nonoperating Income (Expense) [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Maximum Maximum [Member] Schedule of Equity Method Investments [Table] Equity Method Investment [Table] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Profit before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Schedule of revenue from external customers and long-lived assets, by geographical areas Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Reimbursable revenues and expenses Reimbursable [Member] Reimbursable [Member] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Other non-current liabilities Total other non-current liabilities Other Liabilities, Noncurrent Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Deferred revenue Increase (Decrease) in Deferred Revenue Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Contract revenues Contract Revenues [Member] Revenue earned during the period arising from products sold or services provided under the terms of a contract, when it serves as a benchmark in a concentration of risk calculation. Name Measure Name Letter of Credit Letter of Credit [Member] Secured Debt Secured Debt [Member] Deferred tax liabilities Deferred Income Tax Liabilities, Net Document Fiscal Period Focus Document Fiscal Period Focus Unfavorable drilling contracts Unfavorable Drilling Contracts, Current Liabilities Unfavorable Drilling Contracts, Current Liabilities Unsecured Debt Unsecured Debt [Member] Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Award Type Award Type [Axis] Non-current contract liabilities (classified within other non-current liabilities) Contract liabilities Contract with Customer, Liability, Noncurrent Total debt Long-term debt Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] Total assets Assets Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Trading Symbol Schedule of investment in associated companies Recorded Equity In Statutory Accounts Of Equity Method Investees [Table Text Block] Tabular disclosure of the share of recorded equity in the statutory accounts of the entity's equity method investees. Geographical [Domain] Geographical [Domain] Entity Address, City or Town Entity Address, City or Town Cash flows from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Talos Talos [Member] Talos Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Emerging Growth Company Entity Emerging Growth Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Equipment Property, Plant and Equipment, Other, Net Less: bond issuance costs Debt Issuance Costs, Net Total restricted cash Restricted Cash and Cash Equivalent Equity method investment Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Related Party Related Party [Member] PEO PEO [Member] Schedule of share capital Schedule of Common Stock Outstanding Roll Forward [Table Text Block] United States UNITED STATES Changes in operating assets and liabilities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Retained earnings Retained Earnings [Member] Other cash movements in operating activities Other Cash Movements in Operating Activities [Abstract] Other Cash Movements in Operating Activities [Abstract] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Cash and cash equivalents, including restricted cash, at beginning of the period Cash and cash equivalents, including restricted cash, at the end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Income tax expense Income tax expense Income Tax Expense (Benefit) Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Guarantees in favor of customers Performance Guarantee [Member] Taxes payable Taxes Payable, Current Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Debt issued as a percent of par (as a percent) Debt Instrument, Issued As A Percent Of Par Debt Instrument, Issued As A Percent Of Par Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Customer concentration risk Customer Concentration Risk [Member] Number of rigs Number Of Rigs Number Of Rigs Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Sete Brazil Claim Sete Brazil Claim [Member] Sete Brazil Claim Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Other Cash Pledged As Collateral, Other [Member] Cash Pledged As Collateral, Other City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Accrued expenses Accrued Liabilities, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] LLOG LLOG [Member] LLOG Schedule of contract assets and contract liabilities from contracts with customers Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Cash flows from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash used in operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Debt instrument, term Debt Instrument, Term Related Party Transactions [Abstract] Related Party Transactions [Abstract] Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Unsecured senior convertible bond Unsecured Convertible Notes [Member] Unsecured Convertible Notes Subsequent event Subsequent Event [Member] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Estimate of possible loss Loss Contingency, Estimate of Possible Loss PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Add-on services Related Party Revenue, Add-On Services [Member] Related Party Revenue, Add-On Services Equity Components [Axis] Equity Components [Axis] Convertible debt Convertible Debt [Member] General information Nature of Operations [Text Block] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Total debt premium Debt Instrument, Unamortized Discount (Premium), Net Entity Address, Country Entity Address, Country Other Performance Measure, Amount Other Performance Measure, Amount Schedule of restricted cash Restrictions on Cash and Cash Equivalents [Table Text Block] Entity Address, State or Province Entity Address, State or Province Related Party [Domain] Related and Nonrelated Parties [Domain] Deferred contract costs Increase (Decrease) in Deferred Charges Total current liabilities Liabilities, Current Individual: Individual [Axis] Other current assets Total other current assets Other Assets, Current Entity [Domain] Entity [Domain] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Sonadrill fees claimant Sonadrill Fees Claimant [Member] Sonadrill Fees Claimant Document Fiscal Year Focus Document Fiscal Year Focus Basis of presentation Basis of Accounting, Policy [Policy Text Block] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Entity Interactive Data Current Entity Interactive Data Current Management fee revenues Related Party Revenue, Management Fees [Member] Related Party Revenue, Management Fees [Member] Carrying value Reported Value Measurement [Member] Merger and integration related expenses Business Combination, Acquisition-Related Cost, Expense Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Equity [Abstract] Equity [Abstract] Contract value deduction Contract Value Deduction, Value Contract Value Deduction, Value Seadrill Serviços de Petróleo Ltda ("Seadrill Brazil") Seadrill Servicos De Petroleo Ltda Seadrill Brazil [Member] Seadrill Servicos De Petroleo Ltda Seadrill Brazil Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Other Commitments [Line Items] Other Commitments [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Revenue From Contract With Customer [Roll Forward] Revenue From Contract With Customer [Roll Forward] Revenue From Contract With Customer Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Selling, general and administrative expenses Selling, General and Administrative Expense Deferred tax assets Deferred Income Tax Assets, Net Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization Other non-current assets Other Assets, Noncurrent Debt conversion, converted instrument ratio Debt Instrument, Convertible, Conversion Ratio Accrued interest expense Interest Payable, Current Customer [Domain] Customer [Domain] Central Index Key Entity Central Index Key PEO Name PEO Name Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Total operating revenues Revenues Total operating revenues Revenues Unrealized gain on foreign exchange Unrealized Gain (Loss), Derivative and Foreign Currency Transaction Price Change, Operating, before Tax Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Revolving Credit Facility Revolving Credit Facility [Member] Arrangement Duration Trading Arrangement Duration Other liabilities Other Sundry Liabilities, Noncurrent Current contract liabilities (classified within other current liabilities) Contract liabilities Contract with Customer, Liability, Current Prepaid expenses Increase (Decrease) in Prepaid Expense and Other Assets Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Other Payment for (Proceeds from) Other Investing Activity Subsequent Event Type [Axis] Subsequent Event Type [Axis] ASSETS Assets [Abstract] Other Other Customers [Member] Other Customers Long-term debt Long-Term Debt, Excluding Current Maturities Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] Fair value of financial instruments Fair Value Disclosures [Text Block] Credit Facility [Domain] Credit Facility [Domain] Shareholders' equity Equity, Attributable to Parent [Abstract] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Accumulated other comprehensive income AOCI Attributable to Parent [Member] Debt instrument, interest rate (as percent) Debt Instrument, Interest Rate, Stated Percentage Investment, Name [Axis] Investment, Name [Axis] Lease liabilities Operating Lease, Liability, Noncurrent Contract value deduction percentage Contract Value Deduction Percentage Contract Value Deduction Percentage Fair Value as of Grant Date Award Grant Date Fair Value Entity Bankruptcy Proceedings, Reporting Current Entity Bankruptcy Proceedings, Reporting Current Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Schedule of debt Schedule of Long-Term Debt Instruments [Table Text Block] Effect on dilution (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Total operating expenses Costs and Expenses Related Party Transaction [Line Items] Related Party Transaction [Line Items] Document Quarterly Report Document Quarterly Report Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Schedule of accounts payable and accrued liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Related Party [Axis] Related and Nonrelated Parties [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Restatement Determination Date: Restatement Determination Date [Axis] Vessel and rig operating expenses Vessel and Rig [Member] Vessel and Rig [Member] Non-PEO NEO Non-PEO NEO [Member] Outstanding letters of credit and bank guarantees Letters of Credit Outstanding, Amount Brazil BRAZIL Name Trading Arrangement, Individual Name Term SOFR Term SOFR [Member] Term SOFR All Award Types Award Type [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Other Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Accounts receivable, net Increase (Decrease) in Accounts and Other Receivables Compensation Amount Outstanding Recovery Compensation Amount Debt instrument, face amount Debt Instrument, Face Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Drilling units, accumulated depreciation Drilling Units, Accumulated Depreciation Drilling Units, Accumulated Depreciation Fee expense Litigation Settlement, Fee Expense Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair value Estimate of Fair Value Measurement [Member] Amortization of revenue included in the contract liability balance Contract with Customer, Liability, Revenue Recognized MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Angola ANGOLA Reimbursable revenues Related Party Revenue, Reimbursable Revenue [Member] Related Party Revenue, Reimbursable Revenue Other current assets Other Assets Disclosure [Text Block] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Operating revenues Revenues [Abstract] Share based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Litigation Case [Axis] Litigation Case [Axis] Tax Year 2008, 2012, 2016, and 2017 Tax Year 2008, 2012, 2016, And 2017 [Member] Tax Year 2008, 2012, 2016, And 2017 Damages sought Loss Contingency, Damages Sought, Value Total non-current assets Assets, Noncurrent Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Amortization of bond issuance costs Amortization of Debt Issuance Costs and Discounts Minimum Minimum [Member] Non-current assets Assets, Noncurrent [Abstract] Company Selected Measure Name Company Selected Measure Name $575 million secured bond (Level 1) Second Lien Facility [Member] Second Lien Facility Fair Value Measurement [Domain] Fair Value Measurement [Domain] Management contract revenues Management Contract Revenues Management Contract Revenues Debt Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Trade accounts payable Accounts Payable, Current Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Diluted loss available to stockholders Net Income (Loss) Available to Common Stockholders, Diluted All Executive Categories All Executive Categories [Member] Common shares of par value $0.01 per share: 375,000,000 shares authorized as of March 31, 2026 (December 31, 2025: 375,000,000) and 62,449,447 issued as of March 31, 2026 (December 31, 2025: 62,374,171) Beginning balance Ending balance Common Stock, Value, Issued Tax Period [Axis] Tax Period [Axis] Commitments and contingencies Commitments and Contingencies Disclosure [Text Block] Weighted average number of common shares outstanding adjusted for the effects of dilution (in shares) Weighted Average Number of Shares Outstanding, Diluted Commitments and contingencies (see Note 13) Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Restricted Cash and Investments [Abstract] Restricted Cash and Investments [Abstract] Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Restricted Cash and Cash Equivalent Item [Line Items] Restricted Cash and Cash Equivalent Item [Line Items] Document Transition Report Document Transition Report Schedules of concentration of risk Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Uncertain tax positions Uncertain Tax Positions, Noncurrent Liabilities Uncertain Tax Positions, Noncurrent Liabilities Underlying Securities Award Underlying Securities Amount Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Taxation Income Tax Disclosure [Text Block] Premium on bond issuance Debt Instrument, Unamortized Premium Diluted loss per share: Earnings Per Share, Diluted [Abstract] Delay penalties Loss Contingency, Delay Penalty, Percentage Loss Contingency, Delay Penalty, Percentage Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Debt Debt Instrument, Fair Value Disclosure Scenario [Axis] Scenario [Axis] Tax Year 2009 Tax Year 2009 [Member] Sonadrill Sonadrill [Member] Sonadrill Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Loss per share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Additional paid-in capital Additional Paid in Capital Product and Service [Axis] Product and Service [Axis] Contract revenues Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Name Forgone Recovery, Individual Name Total current assets Assets, Current Range [Axis] Statistical Measurement [Axis] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Line of credit facility, unused capacity, commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Amounts due from related parties, net Other Receivables, Net, Current Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Taxes withheld on employee stock transactions Payment, Tax Withholding, Share-Based Payment Arrangement Five Year First Lien Revolving Credit Facility Five Year First Lien Revolving Credit Facility [Member] Five Year First Lien Revolving Credit Facility Schedule of other assets Schedule of Other Assets [Table Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Current liabilities Liabilities, Current [Abstract] $ thousands Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Geographical [Axis] Geographical [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Number of future contracts Number Of Future Contracts Number Of Future Contracts Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Level 1 Fair Value, Inputs, Level 1 [Member] Other Assets [Abstract] Other Assets [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Diluted (LPS)/EPS (in usd per share) Diluted loss per share (in usd per share) Earnings Per Share, Diluted Forecast Forecast [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Accounts receivables, net Accounts Receivable, after Allowance for Credit Loss, Current Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Title of 12(b) Security Title of 12(b) Security Earnings Per Share [Abstract] Earnings Per Share [Abstract] Total financial and other non-operating items, net Nonoperating Income (Expense) Equity method investment Equity Method Investments and Joint Ventures Disclosure [Text Block] Other current and non-current liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Restricted Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Axis] Award Timing Disclosures [Line Items] Total principal debt Long-Term Debt, Gross Employee withheld taxes, social security and vacation payments Employee-related Liabilities, Current Common shares Equity [Text Block] Deferred contract costs Capitalized Contract Cost, Net, Current Net loss Net loss Net loss available to stockholders Net Income (Loss) Attributable to Parent Expiration Date Trading Arrangement Expiration Date Other Other Geographic Segment [Member] The name of other geographic segments about which segment information is provided by the entity. Non-current liabilities Liabilities, Noncurrent [Abstract] Other liabilities Increase (Decrease) in Other Operating Liabilities Restrictions on Cash and Cash Equivalents [Table] Restrictions on Cash and Cash Equivalents [Table] Revenue Revenue Not from Contract with Customer Adoption Date Trading Arrangement Adoption Date Bilateral Facility Bilateral Facility [Member] Bilateral Facility SFL Hercules Ltd SFL Hercules Ltd [Member] SFL Hercules Ltd Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Entity Current Reporting Status Entity Current Reporting Status Daily Simple Secured Overnight Financing Rate Daily Simple Secured Overnight Financing Rate [Member] Daily Simple Secured Overnight Financing Rate Customer [Axis] Customer [Axis] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Operating profit Operating Income (Loss) Retained earnings Retained Earnings (Accumulated Deficit) Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Number of active contracts Number Of Active Contracts Number Of Active Contracts Subsequent Event Type [Domain] Subsequent Event Type [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Payables and Accruals [Abstract] Payables and Accruals [Abstract] Other financial and non-operating items Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Line of credit facility, accordion feature, increase limit Line of Credit Facility, Accordion Feature, Increase Limit Line of Credit Facility, Accordion Feature, Increase Limit Restricted cash Restricted Assets Disclosure [Text Block] Effect of exchange rate changes on cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Deferred tax expense Deferred Income Tax Expense (Benefit)  Adjustments to reconcile net loss to net cash used in operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Lease revenue Related Party Revenue, Leasing Revenue [Member] Related Party Revenue, Leasing Revenue Number of drillships Number Of Drillships Number Of Drillships Variable Rate [Domain] Variable Rate [Domain] Contract liabilities, beginning balance Contract liabilities, ending balance Contract with Customer, Liability Additional contract liabilities recognized, excluding amounts recognized as revenue Contract with Customer, Liability, Cash Received Not Recognized as Revenue Contract with Customer, Liability, Cash Received Not Recognized as Revenue All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Petrobras Petrobras [Member] Petrobras Par value per share ($) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price [Abstract] Other Commitments [Table] Other Commitments [Table] Termination Date Trading Arrangement Termination Date Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Vesting of restricted stock units Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Weighted average number of common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Related party receivables Increase (Decrease) in Due from Related Parties Cost of goods and services sold Cost of Product and Service Sold Schedule of calculation of basic and diluted EPS Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Related Party Transaction [Domain] Related Party Transaction [Domain] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Scenario, Unspecified [Domain] Scenario [Domain] Operating expenses Costs and Expenses [Abstract] Management contract expenses Management Contract Expenses Management Contract Expenses Effect of dilution (interest on unsecured senior convertible bond) Dilutive Securities, Effect on Basic Earnings Per Share Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Common shares, par value (in dollars per share) Beginning balance (usd per share) Ending balance (usd per share) Common Stock, Par or Stated Value Per Share Common shares, issued (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Issued Taxes receivable Income Taxes Receivable, Current Additions to drilling units and equipment Payments to Acquire Machinery and Equipment Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Nigeria NIGERIA Amount awarded Litigation Settlement, Amount Awarded to Other Party Interest expense Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Leasing revenues Operating Lease, Lease Income Vesting of restricted stock units (usd per share) Shares Issued During Period, Shares Repurchased, Par Value Per Share Shares Issued During Period, Shares Repurchased, Par Value Per Share Norway NORWAY Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Total non-current liabilities Liabilities, Noncurrent Other revenues Product and Service, Other [Member] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Interest income Investment Income, Net Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Prepaid expenses Prepaid Expense, Current Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Other current liabilities Total other current liabilities Other Liabilities, Current Other liabilities Other Sundry Liabilities, Current Statement [Line Items] Statement [Line Items] Variable Rate [Axis] Variable Rate [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Counterparty Name [Axis] Counterparty Name [Axis] Common shares Common Stock [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Additions to long-term maintenance Payment of Long Term Maintenance Cost This line represents the payment of long term maintenance cost by the entity. Net decrease in cash and cash equivalents, including restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation