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Actuarial losses and prior service costs for defined benefit pension plans and other postretirement benefit plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Liabilities and Equity Liabilities and Equity [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] 4.700% Unsecured Notes due 2028 4.70% Unsecured Notes [Member] 4.70% Unsecured Notes Maximum Maximum [Member] Equity interest disposed Disposal Group, Including Discontinued Operation, Equity Interest Disposed, Percentage Disposal Group, Including Discontinued Operation, Equity Interest Disposed, Percentage Net loss attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Total capital expenditures Segment, Expenditure, Addition to Long-Lived Assets Building Materials Building Materials [Member] Building Materials Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt 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(Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Schedule of Carrying Values and Estimated Fair Values of Debt Instruments Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Other noncurrent liabilities Total Other noncurrent liabilities Other Liabilities, Noncurrent Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Self-insurance reserves Self Insurance Reserve [Policy Text Block] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Related Party Notes Settled Through Dividend Related Party Notes Settled Through Dividend [Member] Related Party Notes Settled Through Dividend Statement of Cash Flows [Abstract] Current portion of long-term debt Less: current portion of long-term 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Short-Term Debt, Type [Domain] Short-Term Debt, Type [Domain] Cash Flows from Operating Activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Organization and basis of presentation Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Total other segment expenses Segment Reporting, Other Segment Item, Amount Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Inventories Inventory Disclosure [Text Block] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Foreign currency translation and other Accounts Receivable, Allowance For Credit Loss, Foreign Currency Translation And Other Accounts Receivable, Allowance For Credit Loss, Foreign Currency Translation And Other Compensation Actually Paid vs. Other Measure Compensation Actually 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Materials [Member] Aggregates And Other Construction Materials Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Related Party Related Party [Member] Products And Services Purchased From Parent Products And Services Purchased From Parent [Member] Products And Services Purchased From Parent Common stock, outstanding (in shares) Shares, beginning balance (in shares) Shares, ending balance (in shares) Common Stock, Shares, Outstanding Provision (credit) for credit losses Accounts Receivable, Credit Loss Expense (Reversal) PEO PEO [Member] 7.650% Private Placement due 2031 7.65% Notes [Member] 7.65% Notes Proceeds from issuances of long-term related-party debt Proceeds from Related Party Debt Interest income Interest income Investment Income, Interest Income tax payable Accrued Income Taxes, Current Changes in operating assets and liabilities, net of effects of 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Right-Of-Use Asset 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 3.500% Unsecured Notes due 2026 3.50% Unsecured Notes [Member] 3.50% Unsecured Notes Debt instrument, term Debt Instrument, Term Related Party Transactions [Abstract] Retained Retained Earnings, Excluding Net Parent Investment [Member] Retained Earnings, Excluding Net Parent Investment Subsequent Event Subsequent Event [Member] Total lease expense Lease, Cost Goodwill Goodwill Goodwill, beginning balance Goodwill, ending balance Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Schedule of Lease Cost Lease, Cost [Table Text Block] PEO Total Compensation Amount PEO Total Compensation Amount 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Payments Related Party Notes Settled As Equity Contribution Related Party Notes Settled As Equity Contribution [Member] Related Party Notes Settled As Equity Contribution Fair value measurements Fair Value Measurement, Policy [Policy Text Block] Number of shares issued (in shares) Disposal Group, Including Discontinued Operation, Equity Interest, Issued, Number Of Shares Disposal Group, Including Discontinued Operation, Equity Interest, Issued, Number Of Shares Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Total current liabilities Liabilities, Current Individual: Individual [Axis] Defined contribution plan, cost Defined Contribution Plan, Cost Total property, plant and equipment Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Loss per share Earnings Per Share Reconciliation [Abstract] Schedule of Asset Retirement Obligations Schedule of Asset Retirement Obligations [Table Text Block] Leases Lessee, Finance Leases [Text Block] Right-of-use assets obtained in exchange for new finance lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Entity [Domain] Entity [Domain] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Remaining performance obligation, expected timing of satisfaction, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 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] Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Basis of presentation Basis of Accounting, Policy [Policy Text Block] Operating lease right-of-use assets, net Operating lease right-of-use assets, net Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Employee-related liabilities other than pension Accrued Employee Benefits, Current Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Warranty reserves Product Warranty Accrual, Noncurrent Operating lease expense Operating Lease, Cost Accounts receivable, net Accounts and Nontrade Receivable [Text Block] Carrying amount Reported Value Measurement [Member] Equity [Abstract] Segment information Segment Reporting Disclosure [Text Block] Goodwill [Table] Goodwill [Table] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Tax matters agreement, term Tax Matters Agreement, Term Tax Matters Agreement, Term Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Other Commitments [Line Items] Other Commitments [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Other liabilities assumed Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Accumulated other comprehensive loss Comprehensive Income (Loss) Note [Text Block] Amortization of long-lived intangible assets Amortization of Intangible Assets Semi-finished and finished goods Inventory, Finished Goods and Work in Process, Net of Reserves Selling, general and administrative expenses Selling, general and administrative expenses Selling, General and Administrative Expense Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Depreciation and depletion expense Depreciation, Depletion and Amortization Other noncurrent assets Other Assets, Noncurrent Movement in Standard Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward] Accrued interest Interest Payable, Current Central Index Key Entity Central Index Key PEO Name PEO Name Total ARO liability Balance as of January 1 Balance as of March 31 Asset Retirement Obligation 4.200% Unsecured Notes due 2033 4.20% Unsecured Notes [Member] 4.20% Unsecured Notes 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] Supplemental Cash Flow Elements [Abstract] Due from related party Increase (Decrease) in Due from Related Parties, Current Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Revolving Credit Facility Revolving Credit Facility [Member] O 2026 A Dividends O 2026 A Dividends [Member] O 2026 A Dividends Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Other Other Sundry Liabilities, Noncurrent Contract liabilities Contract with Customer, Liability, Current Segments [Axis] Segments [Axis] Warranty reserves Product Warranty Accrual, Current Exercise Price Award Exercise Price Total 2026 Acquisitions Business Combination, Series of Individually Immaterial Business Combinations [Member] Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Trade receivables Accounts Receivable, before Allowance for Credit Loss, Current Noncurrent portion of contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Other investing activities, net Payment for (Proceeds from) Other Investing Activity Subsequent Event Type [Axis] Subsequent Event Type [Axis] Share-based compensation Share-Based Payment Arrangement [Text Block] Discontinued Operations, Disposed of by Means Other than Sale, Spinoff Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] Intangible assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Assets Assets [Abstract] Long-term debt Long-Term Debt, Excluding Current Maturities Credit Facility [Axis] Credit Facility [Axis] Nonrelated Party Nonrelated Party [Member] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] Pension and other postretirement benefits Retirement Benefits [Text Block] Business Combination [Line Items] Business Combination [Line Items] Credit Facility [Domain] Credit Facility [Domain] 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] Cement Cement [Member] Cement Self-insurance reserves Self Insurance Reserve, Current Proceeds from short-term borrowings, net Proceeds from Short-Term Debt Entity Address, Address Line One Entity Address, Address Line One Accumulated other comprehensive Total AOCI Attributable to Parent [Member] Debt instrument, interest rate Debt Instrument, Interest Rate, Stated Percentage Less: allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Schedule of Revenue from External Customers by Products and Services Revenue from External Customers by Products and Services [Table Text Block] Noncurrent operating lease liabilities Noncurrent portion of operating lease liabilities Operating Lease, Liability, Noncurrent Foreign Currency Translation Adjustment, Noncontrolling Interest Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member] 4.750% Unsecured Notes due 2046 4.75% Unsecured Notes [Member] 4.75% Unsecured Notes Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Fair Value as of Grant Date Award Grant Date Fair Value Property, Plant and Equipment [Abstract] Registrant Name Entity Registrant Name Total Segment Adjusted EBITDA Adjusted Earnings Before Interest Tax Depreciation And Amortization Adjusted Earnings Before Interest Tax Depreciation And Amortization Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net periodic pension benefit costs Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Spin-off and separation-related costs Spin-Off Related Costs Spin-Off Related Costs Schedule of Long-Term Debt Instruments Schedule of Long-Term Debt Instruments [Table Text Block] Dilutive effect of share-based awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Related Party Transaction [Line Items] Related Party Transaction [Line Items] Total costs Asset Retirement Obligation Costs Asset Retirement Obligation Costs Document Quarterly Report Document Quarterly Report Long-term debt, fair value Long-Term Debt, Fair Value Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Decrease for payments Standard Product Warranty Accrual, Decrease for Payments Finance lease right-of-use assets Finance Lease, Right-of-Use Asset, before Accumulated Amortization Building Envelope Building Envelope [Member] Building Envelope Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Reconciling items Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Depreciation Asset Retirement Obligation, Depreciation Asset Retirement Obligation, Depreciation Restatement Determination Date: Restatement Determination Date [Axis] Non-PEO NEO Non-PEO NEO [Member] Amrize Ltd Amrize Ltd [Member] Amrize Ltd Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Asset retirement obligations Current ARO liability Asset Retirement Obligation, Current Other financing activities, net Proceeds from (Payment for) Other Financing Activity Interest expense, debt Interest Expense, Debt Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Amounts reclassified from Accumulated other comprehensive loss to Net income Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] Self insurance reserves Self Insurance Reserve Noncontrolling interests Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Other items, net Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount 6.875% Unsecured Notes due 2039 6.875% Unsecured Notes [Member] 6.875% Unsecured Notes Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Litigation-related costs Litigation Settlement, Fee Expense Statement of Comprehensive Income [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair value Estimate of Fair Value Measurement [Member] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Schedule of Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss [Table Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Other contractual commitments Other Commitment S 2026 A Dividends S 2026 A Dividends [Member] S 2026 A Dividends Defined Benefit Pension and Other Postretirement Plans, Noncontrolling Interest Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest [Member] Total lease liabilities Lease, Liability Lease, Liability Credit Loss [Abstract] Share-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Treasury stock, 13,360,111 shares as of March 31, 2026 and 13,792,988 shares as of December 31, 2025 Treasury Stock, Value Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Country Region Country Region Other non-cash activities with Parent, net Other Non-Cash Activities With Parent, Net Other Non-Cash Activities With Parent, Net Segments [Domain] Segments [Domain] Performance Shares Performance Shares [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Inventories, net Increase (Decrease) in Inventories Inventories, net Total inventories, net Inventory, Net Minimum Minimum [Member] Accretion Accretion expense Asset Retirement Obligation, Accretion Expense Land and mineral reserves Land And Mineral Reserves [Member] Land And Mineral Reserves Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Accrued environmental remediation obligations Accrual for Environmental Loss Contingencies Fair Value Measurement [Domain] Fair Value Measurement [Domain] Asset retirement obligations Asset Retirement Obligation Disclosure [Text Block] Debt Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Operating cash flows used for operating leases Operating Lease, Payments Increase for warranties Standard Product Warranty Accrual, Increase for Warranties Issued Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] All Executive Categories All Executive Categories [Member] Common stock, par value of $0.01 per share, 680,250,615 shares authorized, 566,875,513 issued and 553,515,402 outstanding as of March 31, 2026 566,875,513 issued and 553,082,525 outstanding as of December 31, 2025 Common Stock, Value, Issued Finance lease right-of-use assets, net Finance Lease, Right-of-Use Asset, after Accumulated Amortization Goodwill [Roll Forward] Goodwill [Roll Forward] Commitments and contingencies Commitments and Contingencies Disclosure [Text Block] Diluted (in shares) Diluted weighted-average number of shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Commitments and contingencies (see Note 17) Commitments and Contingencies Net transfers to Holcim Net Transfers To Parent Net Transfers To Parent Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Raw materials, parts, and supplies Inventory, Raw Materials and Supplies, Net of Reserves Business Combination [Axis] Business Combination [Axis] Total comprehensive loss Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 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Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Scenario [Domain] Scenario [Domain] Charge-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Recorded Unconditional Purchase Obligation, Category [Domain] Recorded Unconditional Purchase Obligation, Category [Domain] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, issued (in shares) Common Stock, Shares, Issued Net working capital Business Combination, Recognized Asset Acquired, Net Working Capital Business Combination, Recognized Asset Acquired, Net Working Capital Goodwill and intangible assets, net Goodwill and Intangible Assets Disclosure [Text Block] Due to related party Increase (Decrease) in Due to Related Parties, Current Use of estimates Use of Estimates, Policy [Policy Text Block] Net repayments of short-term related-party debt Proceeds From (Repayments Of) Short-Term Related Party Debt Proceeds From (Repayments Of) Short-Term Related Party Debt Operating cash flows used for finance leases Finance Lease, Interest Payment on Liability Interest expense Interest expense Interest Expense, Nonoperating Schedule of Goodwill Schedule of Goodwill [Table Text Block] Trading Arrangement: Trading Arrangement [Axis] Pension liabilities Liability, Defined Benefit Pension Plan, Current Total Shareholder Return Amount Total Shareholder Return Amount Holcim Ltd Holcim Ltd [Member] Holcim Ltd Subsequent events Subsequent Events [Text Block] Foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Capital Addition Purchase Commitments Capital Addition Purchase Commitments [Member] Total Liabilities Liabilities Accrued purchases of property, plant and equipment Capital Expenditures Incurred but Not yet Paid Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Other current liabilities Total Other current liabilities Other Liabilities, Current Other Other Sundry Liabilities, Current Statement [Line Items] Statement [Line Items] Consolidation Items [Axis] Consolidation Items [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Subsequent Event [Line Items] Subsequent Event [Line Items] Common stock Common Stock [Member] Entity Incorporation, State 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