Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Title of 12(b) Security Title of 12(b) Security Subsequent Event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus Performance obligation, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Withheld taxes and other deductions Withheld Taxes and Other Deductions, Current Withheld Taxes and Other Deductions, Current Adjustment to Compensation, Amount Adjustment to Compensation Amount Customer [Axis] Customer [Axis] Segment Reporting [Abstract] Tanajib Holding Company Tanajib Holding Company [Member] Tanajib Holding Company Ordinary shares (€1.00 par value, 200 shares authorized and 200 shares issued and outstanding) as of March 31, 2026 and December 31, 2025, respectively Common Stock, Value, Issued Accrued payroll and employee related liabilities Employee-related Liabilities, Current Other 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Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Beginning balance, shares outstanding (in shares) Ending balance, shares outstanding (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Foreign currency translation Restructuring Reserve, Translation and Other Adjustment Currency translation reserve Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Diluted (in dollars per share) Earnings per ordinary shares — diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Baker Hughes And Akastor Baker Hughes And Akastor [Member] Baker Hughes And Akastor Prepaid and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Cash flow hedges, tax expense (benefit) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Other Akastor companies Other Akastor Companies [Member] Other Akastor Companies Summary of the Fair Value of Assets Acquired and Liabilities Assumed Business Combination [Table Text Block] Customer Three Customer Three [Member] Customer Three Ownership [Domain] Ownership [Domain] Proceeds from issuance of long-term loans—revolving credit facilities Proceeds from Long-Term Lines of Credit Research and development expenses Research and development expenses Research and Development Expense Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] IPO IPO [Member] Employee Benefit Expenses Defined Benefit Plan [Text Block] Share-Based Payment Arrangement [Abstract] Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property, plant and equipment, net of accumulated depreciation of $72,980 and $67,372, respectively Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Product Warranty Liability [Line Items] Product Warranty Liability [Line Items] Interest cost Defined Benefit Plan, Interest Cost Price per share (in dollars per share) Shares Issued, Price Per Share Summary of Changes in the Provision Balance for Restructuring and Other Charges Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Akastor AS Akastor AS [Member] Akastor AS Derivative financial instruments Derivative Asset Inventories Inventory Disclosure [Text Block] Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Equity Awards Adjustments, 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[Abstract] All Trading Arrangements All Trading Arrangements [Member] Loss related to non-designated hedges Derivative, Gain (Loss) on Derivative, Net Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating income (loss) Operating Income (Loss) Service Service revenue Service [Member] Performance obligation, amount Revenue, Remaining Performance Obligation, Amount Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount 6-12 months Six To Twelve Months [Member] Six To Twelve Months Derivative [Line Items] Derivative [Line Items] Business Combinations Business Combination [Text Block] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] 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] Service cost Defined Benefit Plan, Service Cost Net income (loss) attributable to HMH Holding B.V. per ordinary share: Net Income (Loss) Available to Common Stockholders, Basic, Operations [Abstract] Deferred offering costs Deferred Costs, Current Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Common stock, shares issued (in shares) Beginning balance, shares issued (in shares) Ending balance, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Provision reversed during the period Standard Product Warranty, Expense Reversal Standard Product Warranty, Expense Reversal Equity Components [Axis] Equity Components [Axis] Accounts receivable and related party accounts receivable Increase (Decrease) in Accounts Receivable Related Party Related Party [Member] Product and Service [Domain] Product and Service [Domain] Cash paid for income taxes, net Income Tax Paid, after Refund Received Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Provisions—restructuring Restructuring Reserve, Current Class A Common Stock Common Class A [Member] Entity Interactive Data Current Entity Interactive Data Current Less: Net income (loss) attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest 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 Comprehensive income (loss) attributable to HMH Holding B.V. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Operating income (loss) Operating Income (Loss), Adjusted Operating Income (Loss), Adjusted Germany GERMANY Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Table] Subsequent Events [Abstract] Development costs Payments For Development Costs Payments For Development Costs Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Benefit plans, net of tax benefit of $(7) and tax expense of $129 for the three months ended March 31, 2026 and 2025, respectively Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Non-current debt, net Long-Term Debt Including Related Party Debt, Excluding Current Maturities Long-Term Debt 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Arrangement Duration Trading Arrangement Duration Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Sale of products Product Sales [Member] Product Sales Income (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] Other Noncurrent Liabilities Other Noncurrent Liabilities [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 6 months and less Six Months Or Less [Member] Six Months Or Less Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive 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Disclosures [Table] Legal Entity [Axis] Legal Entity [Axis] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Reductions for payments Payments for Restructuring Baker Hughes Holdings LLC Baker Hughes Holdings LLC [Member] Baker Hughes Holdings LLC Accounts payable and accounts payable—related party Increase (Decrease) in Accounts Payable Other Other Accrued Liabilities, Current 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] Organization and Nature of Business Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Cash consideration paid, including £0.2 million cash acquired Payments to Acquire Businesses, Gross Subsequent Event [Table] Subsequent Event [Table] Number of employees impacted by restructuring plan Restructuring and Related Cost, Expected Number of Positions Eliminated Public duties and taxes Public Duties and Taxes Payable, Current Public Duties and Taxes Payable, Current Schedule of Debt Schedule of Debt [Table Text Block] Deep Blue Deep Blue Oil & Gas Limited [Member] Deep Blue Oil & Gas Limited Customer [Domain] Customer [Domain] Schedule of Inventory, Net of Reserves Schedule of Inventory, Current [Table Text Block] Leases Lessee, Operating Leases [Text Block] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in dollars per share) Earnings per ordinary shares — basic (in dollars per share) Earnings Per Share, Basic Contract liabilities Contract with Customer, Liability, Current Total current assets Assets, Current Insider Trading Arrangements [Line Items] Long-term debt, net Long-term debt, net—related party Long-Term Debt, Excluding Current Maturities Drillform Drillform [Member] Drillform Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Related party accounts receivable Accounts receivable, current Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] 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] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Ordinary shares Common Stock [Member] Contingent consideration Business Combination, Contingent Consideration, Liability Lease operating cost Operating Lease, Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Reclassification Reclassification, Comparability Adjustment [Policy Text Block] Derivative Contract [Domain] Derivative Contract [Domain] Concentration risk, percentage Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Credit Line in China Foreign Line of Credit [Member] Currency translation differences Goodwill, Foreign Currency Translation, Gain (Loss) Equity Awards Adjustments Equity Awards Adjustments [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Total liabilities and shareholders’ equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Non-controlling interests Equity, Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Other current and long-term liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Restructuring and other expenses Restructuring Charges Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Inventory Disclosure [Abstract] Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Accrued sales and other taxes Sales and Excise Tax Payable, Current Other non-operating income (loss), net Other non-operating income (loss) Other Nonoperating Income (Expense) Name Awards Close in Time to MNPI Disclosures, Individual Name Shareholders’ equity Equity, Including Portion Attributable to Noncontrolling Interest [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] Schedule of Other Current Liabilities Other Current Liabilities [Table Text Block] Sale of stock, price per share (in dollars per share) Sale of Stock, Price Per Share Financial Instruments Derivatives and Fair Value [Text Block] Change In Contract With Customer Liability [Roll Forward] Change In Contract With Customer Liability [Roll Forward] Change In Contract With Customer Liability Adjustment to Compensation: Adjustment to Compensation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Class of Stock [Domain] Class of Stock [Domain] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Foreign exchange forward contracts Foreign Exchange Forward [Member] Hedging Designation [Axis] Hedging Designation [Axis] Inventory [Line Items] Inventory [Line Items] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total assets Assets, Fair Value Disclosure Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts payable—related party Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Total consideration Business Combination, Consideration Transferred Accrued expense Warranty expense Product Warranty Expense Derivative Maturity [Axis] Derivative Maturity [Axis] Derivative Maturity Additional paid-in capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Stock of raw materials Inventory, Raw Materials, Net of Reserves Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Mercury HoldCo Inc. Mercury HoldCo Inc. [Member] Mercury HoldCo Inc. Reconciliation of Segment Performance Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] Derivative financial instruments—not designated as hedging instruments Not Designated as Hedging Instrument [Member] Depreciation and amortization Depreciation, Depletion and Amortization Net income (loss) Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Commitment and Contingencies Commitments, Contingencies, Restructuring And Guarantees [Text Block] Commitments, Contingencies, Restructuring And Guarantees Other corporate costs Other Corporate Expense Other Corporate Expense Current assets Assets, Current [Abstract] Derivative financial instruments Derivative Liability Non-PEO NEO Non-PEO NEO [Member] 7.875% Senior Secured Bonds due 2028 Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Income tax (expense) benefit Tax provision Income Tax Expense (Benefit) Foreign currency gain (loss), net Foreign currency gain (loss) Gain (Loss), Foreign Currency Transaction, before Tax Centralized finance costs Centralized Finance Expense Centralized Finance Expense Customer Concentration Risk Customer Concentration Risk [Member] Total cost of sales Cost of sales Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Net (decrease) / increase in cash and cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Numerator (in thousands) Net Income (Loss) Attributable to Parent [Abstract] Provisions for loss contingencies Loss Contingency, Accrual, Current Amortization of net actuarial loss Defined Benefit Plan, Amortization of Gain (Loss) Net income (loss) attributable to HMH Holding B.V. 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] Voting power percentage Subsidiary, Voting Power Percentage Subsidiary, Voting Power Percentage Number Of Reportable Segments Not Disclosed Flag Number Of Reportable Segments Not Disclosed Flag Number Of Reportable Segments Not Disclosed Flag Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Change in Contract Assets and Liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract]