Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Cash held in escrow Cash Held In Escrow [Member] Cash Pledged As Collateral, Senior Secured Notes [Member] Range [Domain] Statistical Measurement [Domain] Title of 12(b) Security Title of 12(b) Security Carrying value Reported Value Measurement [Member] Diluted income/(loss) available to stockholders Net Income (Loss) Available to Common Stockholders, Diluted Document Fiscal Year Focus Document Fiscal Year Focus Merger and integration related expenses Business Combination, Acquisition-Related Cost, Expense Adjustment to Compensation, Amount Adjustment to Compensation Amount Customer [Axis] Customer [Axis] Common shares of par value $0.01 per share: 375,000,000 shares authorized as of June 30, 2026 (December 31, 2025: 375,000,000) and 62,541,443 issued as of June 30, 2026 (December 31, 2025: 62,374,171) Beginning balance Ending balance Common Stock, Value, Issued Taxes withheld on employee stock transactions Payment, Tax Withholding, Share-Based Payment Arrangement Employee withheld taxes, social security and vacation payments Employee-related Liabilities, Current Schedule of debt Schedule of Long-Term Debt Instruments [Table Text Block] Guarantor obligations, maximum exposure, undiscounted Guarantor Obligations, Maximum Exposure, Undiscounted Restatement Determination Date Restatement Determination Date Vesting of restricted stock units (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Effect of dilution (interest on unsecured senior convertible bond) Dilutive Securities, Effect on Basic Earnings Per Share Amendment Flag Amendment Flag Current liabilities Liabilities, Current [Abstract] Weighted average share price (in usd per share) Shares Acquired, Average Cost Per Share Other liabilities Other Sundry Liabilities, Current Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Drilling units, net of accumulated depreciation of 827 as of June 30, 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. Total non-current liabilities Liabilities, Noncurrent Related party transactions Related Party Transactions Disclosure [Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Common shares, par value (in dollars per share) Beginning balance (in dollars per share) Ending balance (in dollars per share) Common Stock, Par or Stated Value Per Share Non-current liabilities Liabilities, Noncurrent [Abstract] Weighted average number of common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Schedule of related party transactions Schedule of Related Party Transactions [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Management fee received Related Party Transaction, Management Fee Received Related Party Transaction, Management Fee Received Total current liabilities Liabilities, Current Nigeria NIGERIA Deferred revenue Increase (Decrease) in Deferred Revenue Entity Address, City or Town Entity Address, City or Town Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Payment of make whole premium on secured bond Payment Of Make Whole Premium On Secured Debt Payment Of Make Whole Premium On Secured Debt Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of presentation Basis of Accounting, Policy [Policy Text Block] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Reimbursable revenues and expenses Reimbursable [Member] Reimbursable [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] United States UNITED STATES Concentration Risk Type [Axis] Concentration Risk Type [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] 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. Significant accounting policies New Accounting Pronouncements, Policy [Policy Text Block] Litigation Case [Axis] Litigation Case [Axis] Unsecured Debt Unsecured Debt [Member] Related Party [Axis] Related and Nonrelated Parties [Axis] Unfavorable drilling contracts Unfavorable Drilling Contracts, Current Liabilities Unfavorable Drilling Contracts, Current Liabilities Total debt Long-term debt Long-Term Debt Document Period End Date Document Period End Date 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] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Debt instrument, face amount Debt Instrument, Face Amount Basic earnings/(loss) per share: Earnings Per Share, Basic [Abstract] 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. Common shares Equity [Text Block] Operating expenses Costs and Expenses [Abstract] Security Exchange Name Security Exchange Name Debt instrument, term Debt Instrument, Term Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Accrued interest expense Interest Payable, Current Talos Talos [Member] Talos Earnings/(loss) per share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share [Abstract] Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Trading Symbol Trading Symbol Entity Bankruptcy Proceedings, Reporting Current Entity Bankruptcy Proceedings, Reporting Current Geographical [Domain] Geographical [Domain] 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] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Company Selected Measure Name Company Selected Measure Name Schedule of restricted cash Restrictions on Cash and Cash Equivalents [Table Text Block] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Amortization of debt issuance costs Amortization of Debt Issuance Costs and Discounts Diluted earnings/(loss) per share: Earnings Per Share, Diluted [Abstract] Total principal debt Long-Term Debt, Gross Credit Facility [Domain] Credit Facility [Domain] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Cash flows from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Other liabilities Other Sundry Liabilities, Noncurrent Other cash movements in operating activities Other Cash Movements in Operating Activities [Abstract] Other Cash Movements in Operating Activities [Abstract] Amounts due from related parties, net Other Receivables, Net, Current Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted average number of common shares outstanding adjusted for the effects of dilution (in shares) Weighted Average Number of Shares Outstanding, Diluted Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Number of rigs Number Of Rigs Number Of Rigs Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Sete Brazil Claim Sete Brazil Claim [Member] Sete Brazil Claim Award Timing Predetermined Award Timing Predetermined [Flag] Restricted cash Restricted Cash, Current Outstanding letters of credit and bank guarantees Letters of Credit Outstanding, Amount Other Cash Pledged As Collateral, Other [Member] Cash Pledged As Collateral, Other Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Share based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Level 1 Fair Value, Inputs, Level 1 [Member] Schedules of concentration of risk Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Debt conversion, converted instrument ratio Debt Instrument, Convertible, Conversion Ratio LLOG LLOG [Member] LLOG Effect on dilution (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements All Executive Categories All Executive Categories [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Unsecured senior convertible bond Unsecured Convertible Notes [Member] Unsecured Convertible Notes Scenario, Unspecified [Domain] Scenario [Domain] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Add-on services Related Party Revenue, Add-On Services [Member] Related Party Revenue, Add-On Services Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Schedule of calculation of basic and diluted EPS/(LPS) Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Minimum Minimum [Member] Expiration Date Trading Arrangement Expiration Date Total restricted cash Restricted Cash and Cash Equivalent Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] 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] Schedule of share capital Schedule of Common Stock Outstanding Roll Forward [Table Text Block] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Common shares, authorized (in shares) Common Stock, Shares Authorized Accounts receivable, net Increase (Decrease) in Accounts and Other Receivables Exercise Price Award Exercise Price Vesting of restricted stock units Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Cash flows from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Related Party Transaction [Axis] Related Party Transaction [Axis] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Sonadrill fees claimant Sonadrill Fees Claimant [Member] Sonadrill Fees Claimant Document Quarterly Report Document Quarterly Report 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] Effect of exchange rate changes on cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Debt Debt Disclosure [Text Block] Management fee revenues Related Party Revenue, Management Fees [Member] Related Party Revenue, Management Fees [Member] Scenario [Axis] Scenario [Axis] Restricted Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Axis] Less: debt issuance costs Debt Issuance Costs, Net Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity method investment Equity Method Investments Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Secured Debt Secured Debt [Member] Contract value deduction Contract Value Deduction, Value Contract Value Deduction, Value Guarantees in favor of customers Performance Guarantee [Member] Seadrill Serviços de Petróleo Ltda ("Seadrill Brazil") Seadrill Servicos De Petroleo Ltda Seadrill Brazil [Member] Seadrill Servicos De Petroleo Ltda Seadrill Brazil Total operating expenses Costs and Expenses Adoption Date Trading Arrangement Adoption Date Debt instrument, interest rate (as percent) Debt Instrument, Interest Rate, Stated Percentage Counterparty Name [Domain] Counterparty Name [Domain] Total shareholders' equity Beginning balance Ending balance Equity, Attributable to Parent Total financial and other non-operating items, net Nonoperating Income (Expense) Revenue From Contract With Customer [Roll Forward] Revenue From Contract With Customer [Roll Forward] Revenue From Contract With Customer ASSETS Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Insider Trading Policies and Procedures [Line Items] Other current and non-current liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Deferred tax expense Deferred Income Tax Expense (Benefit) Selling, general and administrative expenses Selling, General and Administrative Expense Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Table] Letter of Credit Letter of Credit [Member] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items] Commitments and contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Leasing revenues Operating Lease, Lease Income Central Index Key Entity Central Index Key All Adjustments to Compensation All Adjustments to Compensation [Member] Equity [Abstract] Equity [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] Net cash used in operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Shareholders' equity Equity, Attributable to Parent [Abstract] Income Statement [Abstract] Income Statement [Abstract] Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Investment, Name [Axis] Investment, Name [Axis] Other Other Customers [Member] Other Customers Deferred tax assets Deferred Income Tax Assets, Net Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Schedule of revenue from external customers and long-lived assets, by geographical areas Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table Text Block] Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate City Area Code City Area Code Accumulated other comprehensive income AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Debt Debt Instrument, Fair Value Disclosure Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Contract value deduction percentage Contract Value Deduction Percentage Contract Value Deduction Percentage Total non-current assets Assets, Noncurrent Statement [Line Items] Statement [Line Items] Total assets Assets Entity [Domain] Entity [Domain] Interest income Investment Income, Net Convertible debt Convertible Debt [Member] Interest expense Interest Expense, Nonoperating Other assets Increase (Decrease) in Other Operating Assets General information Nature of Operations [Text Block] PEO PEO [Member] Deferred contract costs Increase (Decrease) in Deferred Charges Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Measurement Basis [Axis] Measurement Basis [Axis] Other non-current liabilities Total other non-current liabilities Other Liabilities, Noncurrent Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Amortization of revenue included in the contract liability balance Contract with Customer, Liability, Revenue Recognized Angola ANGOLA Payables and Accruals [Abstract] Payables and Accruals [Abstract] Vessel and rig operating expenses Vessel and Rig [Member] Vessel and Rig [Member] Lease liabilities Operating Lease, Liability, Noncurrent Taxes payable Taxes Payable, Current Retained earnings Retained Earnings [Member] Revolving Credit Facility Revolving Credit Facility [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Award Timing Disclosures [Line Items] Schedule of fair value of financial instruments measured at amortized cost Fair Value, by Balance Sheet Grouping [Table Text Block] Payment of debt issuance costs Payments of Debt Issuance Costs Diluted EPS/(LPS) (in dollars per share) Diluted earnings/(loss) per share (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Shares withheld for taxes on equity transactions Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Prepaid expenses Increase (Decrease) in Prepaid Expense and Other Assets Litigation Case [Domain] Litigation Case [Domain] Damages paid Loss Contingency, Damages Paid, Value Drilling units, accumulated depreciation Drilling Units, Accumulated Depreciation Drilling Units, Accumulated Depreciation  Adjustments to reconcile net income/(loss) to net cash used in operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Contract revenues Revenue from Contract with Customer, Excluding Assessed Tax Line of credit facility, unused capacity, commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Restricted Cash and Investments [Abstract] Restricted Cash and Investments [Abstract] Reimbursable revenues Related Party Revenue, Reimbursable Revenue [Member] Related Party Revenue, Reimbursable Revenue Surety Bond Surety Bond [Member] Shares repurchased Shares acquired, value Stock Repurchased During Period, Value Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Fair value Estimate of Fair Value Measurement [Member] Revenue from contracts with customers Revenue from Contract with Customer [Text Block] Prepaid expenses Prepaid Expense, Current Tax Year 2008, 2012, 2016, and 2017 Tax Year 2008, 2012, 2016, And 2017 [Member] Tax Year 2008, 2012, 2016, And 2017 Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items] Other Payment for (Proceeds from) Other Investing Activity Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Schedule of Equity Method Investments [Table] Equity Method Investment [Table] $ thousands Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Other current assets Total other current assets Other Assets, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Financial and other non-operating items Other Nonoperating Income (Expense) [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating profit Operating Income (Loss) $575 million secured bond (Level 1) Second Lien Facility [Member] Second Lien Facility Management contract revenues Management Contract Revenues Management Contract Revenues Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Related Party Transaction [Domain] Related Party Transaction [Domain] Common shares, vested and pending approval (in shares) Stock Repurchased During Period, Shares 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] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Restricted Cash and Cash Equivalent Item [Line Items] Restricted Cash and Cash Equivalent Item [Line Items] Common shares, issued (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Equity method investment Equity Method Investments and Joint Ventures Disclosure [Text Block] Other current assets Other Assets Disclosure [Text Block] $700 million senior bond Senior Notes Due 2034 [Member] Senior Notes Due 2034 Equity Components [Axis] Equity Components [Axis] Related Party Related Party [Member] Product and Service [Domain] Product and Service [Domain] Uncertain tax positions Uncertain Tax Positions, Noncurrent Liabilities Uncertain Tax Positions, Noncurrent Liabilities Entity Interactive Data Current Entity Interactive Data Current Deferred tax liabilities Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Termination Date Trading Arrangement Termination Date Delay penalties Loss Contingency, Delay Penalty, Percentage Loss Contingency, Delay Penalty, Percentage Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Sonadrill Sonadrill [Member] Sonadrill MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other current liabilities Total other current liabilities Other Liabilities, Current Other non-current assets Other Assets, Noncurrent Document Type Document Type 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] Accrued expenses Accrued Liabilities, Current Loss on debt extinguishment Loss on debt extinguishment Gain (Loss) on Extinguishment of Debt Other Liabilities [Abstract] Other Liabilities [Abstract] Fair Value as of Grant Date Award Grant Date Fair Value Brazil BRAZIL Amounts due from related parties, net Other Assets, Miscellaneous, Current Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Non-current contract liabilities (classified within other non-current liabilities) Contract liabilities Contract with Customer, Liability, Noncurrent Deferred contract costs Capitalized Contract Cost, Net, Current Entity Address, Postal Zip Code Entity Address, Postal Zip Code Registrant Name Entity Registrant Name Restrictions on Cash and Cash Equivalents [Table] Restrictions on Cash and Cash Equivalents [Table] Profit/(loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (see Note 13) Commitments and Contingencies Total operating revenues Revenues Total operating revenues Revenues Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 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 Other Assets [Abstract] Other Assets [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Five Year First Lien Revolving Credit Facility Five Year First Lien Revolving Credit Facility [Member] Five Year First Lien Revolving Credit Facility Executive Category: Executive Category [Axis] Par value per share ($) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price [Abstract] Counterparty Name [Axis] Counterparty Name [Axis] LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Other Commitments [Table] Other Commitments [Table] Unrealized gain on foreign exchange Unrealized Gain (Loss), Derivative and Foreign Currency Transaction Price Change, Operating, before Tax All Award Types Award Type [Domain] Number of future contracts Number Of Future Contracts Number Of Future Contracts Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair value of financial instruments Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] PEO Name PEO Name Geographical [Axis] Geographical [Axis] Contract liabilities, beginning balance Contract liabilities, ending balance Contract with Customer, Liability Repayment of secured bond Repayments of Secured Debt Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Related party receivables Increase (Decrease) in Due from Related Parties Entity Tax Identification Number Entity Tax Identification Number Legal Entity [Axis] Legal Entity [Axis] Other Commitments [Line Items] Other Commitments [Line Items] 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 Trade accounts payable Increase (Decrease) in Accounts Payable Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] 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] Debt Instrument [Axis] Debt Instrument [Axis] Share based compensation expense Share-Based Payment Arrangement, Noncash Expense Tax Period [Axis] Tax Period [Axis] Investment, Name [Domain] Investment, Name [Domain] Customer [Domain] Customer [Domain] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic EPS/(LPS) (in dollars per share) Basic earnings/(loss) per share (in dollars per share) Earnings Per Share, Basic Current contract liabilities (classified within other current liabilities) Contract liabilities Contract with Customer, Liability, Current Shares repurchased Payments for Repurchase of Common Stock Total current assets Assets, Current Range [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Long-term debt Long-Term Debt, Excluding Current Maturities Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivables, net Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Equipment Property, Plant, and Equipment, Other, after Accumulated Depreciation 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] Other Other Geographic Segment [Member] The name of other geographic segments about which segment information is provided by the entity. Walter Oil & Gas Water, Oil, And Gas [Member] Water, Oil, And Gas Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common shares Common Stock [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Fee expense Litigation Settlement, Fee Expense Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Bilateral Facility Bilateral Facility [Member] Bilateral Facility SFL Hercules Ltd SFL Hercules Ltd [Member] SFL Hercules Ltd Concentration risk percentage Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Equity Awards Adjustments Equity Awards Adjustments [Member] Total liabilities and shareholders' equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Other liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Proceeds from issuance of senior bond Proceeds from Issuance of Senior Long-Term Debt Related Party [Domain] Related and Nonrelated Parties [Domain] Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Number of active contracts Number Of Active Contracts Number Of Active Contracts Other financial and non-operating items Other Nonoperating Income (Expense) Schedule of accounts payable and accrued liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Taxes receivable Income Taxes Receivable, Current Name Awards Close in Time to MNPI Disclosures, Individual Name Entity Address, Country Entity Address, Country 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] Line of credit facility, accordion feature, increase limit Line of Credit Facility, Accordion Feature, Increase Limit Line of Credit Facility, Accordion Feature, Increase Limit Non-current assets Assets, Noncurrent [Abstract] Lease revenue Related Party Revenue, Leasing Revenue [Member] Related Party Revenue, Leasing Revenue Number of drillships Number Of Drillships Number Of Drillships Adjustment to Compensation: Adjustment to Compensation [Axis] Additions to drilling units and equipment Payments to Acquire Machinery and Equipment 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 Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Petrobras Petrobras [Member] Petrobras Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Taxation Income Tax Disclosure [Text Block] Trade accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other Other Noncash Income (Expense) Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional paid-in capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Revenue Revenue Not from Contract with Customer Restricted cash Restricted Assets Disclosure [Text Block] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Management contract expenses Management Contract Expenses Management Contract Expenses Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Tax Period [Domain] Tax Period [Domain] Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Depreciation and amortization Depreciation and amortization Depreciation, Depletion and Amortization Entity Address, Address Line Two Entity Address, Address Line Two Current assets Assets, Current [Abstract] Tax Year 2009 Tax Year 2009 [Member] Non-PEO NEO Non-PEO NEO [Member] Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Income tax expense Income tax expense Income Tax Expense (Benefit) Vesting of restricted stock units (in dollars per share) Shares Issued During Period, Shares Repurchased, Par Value Per Share Shares Issued During Period, Shares Repurchased, Par Value Per Share Customer concentration risk Customer Concentration Risk [Member] Cost of goods and services sold Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] 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 Other revenues Product and Service, Other [Member] Forecast Forecast [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Net income/(loss) Net income/(loss) Net income/(loss) available to stockholders Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Premium on bond issuance Debt Instrument, Unamortized Premium Amount awarded Litigation Settlement, Amount Awarded to Other Party Schedule of contract assets and contract liabilities from contracts with customers Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Schedule of other assets Schedule of Other Assets [Table Text Block] Operating revenues Revenues [Abstract] Damages sought Loss Contingency, Damages Sought, Value Additions to long-term maintenance Payment of Long Term Maintenance Cost This line represents the payment of long term maintenance cost by the entity. Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]