Proceeds from Divestiture of Businesses Proceeds from Divestiture of Businesses Non-trade receivables, net Non-trade receivables, net Nontrade Receivables, Current Swiss franc Switzerland, Francs Accumulated amortization Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Revision of Prior Period [Axis] Revision of Prior Period [Axis] Accrued expenses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Schedule of Short-term Debt Schedule of Short-Term Debt [Table Text Block] Commodity Contract [Member] Commodity Contract [Member] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Schedule of Pension Benefits Expected to be Paid from the Plans or From the Company's Assets Schedule of Expected Benefit Payments [Table Text Block] 2030 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Five Gross amount not offset in the consolidated balance sheets Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset Award Timing Predetermined Award Timing Predetermined [Flag] Indefinite-lived Intangible Assets [Axis] Indefinite-Lived Intangible Assets [Axis] Trade taxes Effective Income Tax Rate Reconciliation, Trade Taxes, Amount Effective Income Tax Rate Reconciliation, Trade Taxes, Amount Entity File Number Entity File Number Additional Paid-In Capital Additional Paid-in Capital [Member] Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Tabular List, Table Tabular List [Table Text Block] Total other comprehensive income (loss), income tax (provision) benefit Income tax (provision) benefit Other Comprehensive Income (Loss), Tax Weighted average target asset allocations Defined Benefit Plan, Plan Assets, Target Allocation, Percentage New Accounting Pronouncements, Policy New Accounting Pronouncements, Policy [Policy Text Block] Environmental Disclosure [Line Items] Environmental Disclosure [Line Items] [Line Items] for Schedule of Environmental Disclosure [Table]. Schedule of Transactions with Affiliates Schedule of Related Party Transactions [Table Text Block] Schedule of Carrying Values and Fair Values of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Guarantee obligations, maximum exposure Guarantor Obligations, Maximum Exposure, Undiscounted Debt Securities [Member] Debt Securities [Member] Goodwill [Line Items] Goodwill [Line Items] Site Contingency, Disbursement Period, Estimate, Accrued Site Contingency, Disbursement Period, Estimate, Accrued Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Revenue Recognition Revenue from Contract with Customer [Text Block] Gross amount not offset in the consolidated balance sheets Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Intangible Asset, Indefinite-Lived [Table] Intangible Asset, Indefinite-Lived [Table] Stock awards (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Total Current Income Tax Expense (Benefit) Pension and postretirement contributions Payment for Pension and Other Postretirement Benefits Assets held for sale Disposal Group, Including Discontinued Operation, Assets Adjustment to Compensation, Amount Adjustment to Compensation Amount Pension Plan [Member] Pension Plan [Member] Net change in short-term borrowings with maturities of 3 months or less Proceeds from (Repayments of) Short-Term Debt, Maturing in Three Months or Less Other assets Increase (Decrease) in Other Operating Assets Consolidation Principles Consolidation, Policy [Policy Text Block] Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Acquisitions, Dispositions and Plant Closures [Abstract] Acquisitions, Dispositions and Plant Closures [Abstract] Acquisitions, Dispositions and Plant Closures [Abstract]. Share-based Payment Arrangement, Option [Member] Share-Based Payment Arrangement, Option [Member] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Effective Income Tax Rate Reconciliation, Percent [Abstract] Effective Income Tax Rate Reconciliation, Percent [Abstract] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities [Axis] Health care cost trend ultimate rate Defined Benefit Plan, Ultimate Health Care Cost Trend Rate Cash dividend Dividends, Common Stock, Cash Asset impairment losses Asset impairment losses Asset Impairment Charges Total Celanese Corporation shareholders' equity Balance as of the beginning of the period Balance as of the end of the period Equity, Attributable to Parent Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Schedule of Property, Plant and Equipment, Net Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized CashFlowLessee [Table Text Block] CashFlowLessee [Table Text Block] CashFlowLessee [Table Text Block] Fair Value, Recurring [Member] Fair Value, Recurring [Member] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] State [Member] State and Local Jurisdiction [Member] Cover [Abstract] Cover [Abstract] Senior unsecured notes due 2033, interest rate of 7.200%(1) USD Senior Unsecured Notes Due 2033 [Member] USD 1 Billion 6.700% Senior Unsecured Notes Due 2033 Maximum Maximum [Member] Finite-lived intangible asset, useful life Finite-Lived Intangible Asset, Useful Life Property, Plant and Equipment, Net [Abstract] Property, Plant and Equipment, Net [Abstract] Trade Receivables Pledged As Collateral Trade Receivables Pledged As Collateral The amount of trade receivables pledged as collateral. Net (earnings) loss attributable to noncontrolling interests Net earnings (loss) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Net book value Finite-Lived Intangible Assets, Net 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] Total Debt, Long-Term and Short-Term, Combined Amount Retirement Benefits [Abstract] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Asset and investment impairment Effective Income Tax Rate Reconciliation, Asset And Investment Impairment, Percent Effective Income Tax Rate Reconciliation, Asset And Investment Impairment, Percent Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Earnings (loss) from continuing operations before tax Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Schedule of Geographical Segments Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Foreign Currency Denominated Debt [Member] Foreign Currency Denominated Debt [Member] Foreign Currency Denominated Debt [Member] Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Mexican peso Mexico, Pesos Loss Contingencies by Nature of Contingency [Axis] Loss Contingency Nature [Axis] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments [Member] Operating Segments [Member] Schedule of Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Comprehensive (income) loss attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Asset Retirement Obligations Asset Retirement Obligation [Policy Text Block] Reserve as of the beginning of the period Reserve as of the end of the period Restructuring Reserve Earnings (loss) from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent CNCC Working Capital Loan Agreement Due June 28, 2027 [Member] CNCC Working Capital Loan Agreement Due June 28, 2027 [Member] Celanese (Nanjing) Chemical Co., Ltd ("CNCC") senior unsecured working capital loan agreement with a borrowing capacity of CNY 800 million, maturing on June 28, 2027. U.S. Income (Loss) from Continuing Operations before Income Taxes, Domestic Operating leases (Note 16) Operating Lease, Liability, Current Interest on lease liabilities Finance Lease, Interest Expense Total plan assets [Member] Total plan assets [Member] Total plan assets [Member]. Document Fiscal Period Focus Document Fiscal Period Focus Goodwill and intangible assets, net Intangible Assets, Net (Including Goodwill) Rate of compensation increase NPBC Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Debt Instrument Tender Purchase Price Per 1000 Principal Amount Debt Instrument Tender Purchase Price Per 1000 Principal Amount Debt Instrument Tender Purchase Price Per 1000 Principal Amount Award Timing Method Award Timing Method [Text Block] Continuing operations - basic (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Award Type Award Type [Axis] Foreign Currency Translation [Member] Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Investment, Name [Domain] Investment, Name [Domain] Korean won Korea (South), Won Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Business Combination Business Combination [Policy Text Block] Changes in valuation allowances Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Issuance of treasury stock under stock plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Environmental Remediation Obligations [Abstract] Environmental Remediation Obligations [Abstract] Entity Address, City or Town Entity Address, City or Town Weighted-average finance leases discount rate Finance Lease, Weighted Average Discount Rate, Percent Exchange rate effects on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Total Deferred Tax Assets, Net of Valuation Allowance Exchange rate changes Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Time Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Thailand, Baht Thailand, Baht Increases (decreases) due to settlements Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Emerging Growth Company Entity Emerging Growth Company 2028 Long-Term Debt, Maturity, Year Three Restructuring (Note 24) Restructuring Reserve, Current Weighted-average remaining finance leases term Finance Lease, Weighted Average Remaining Lease Term 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] Effective Income Tax Rate Reconciliation, U.S. Benefits Of Foreign Derived Intangible Income, Amount Effective Income Tax Rate Reconciliation, U.S. Benefits Of Foreign Derived Intangible Income, Amount Effective Income Tax Rate Reconciliation, U.S. Benefits Of Foreign Derived Intangible Income, Amount Unamortized deferred financing costs(5) Debt Issuance Costs, Net Gain (loss) recognized in Earnings (loss) Derivative, Gain (Loss) on Derivative, Net Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] 2026 Defined Benefit Plan, Expected Future Benefit Payment, Year One Number of Parties included in USEPA order Number of Parties included in USEPA order Number of Parties included in USEPA order. Gross asset value, beginning balance Gross asset value, ending balance Indefinite-Lived Intangible Assets (Excluding Goodwill) Schedule of Equity Securities without Readily Determinable Fair Value Equity Securities without Readily Determinable Fair Value [Table Text Block] Less amounts representing interest Finance Lease, Liability, Undiscounted Excess Amount Senior unsecured notes due 2025, interest rate of 6.050% USD Senior Unsecured Notes Due 2025 [Member] USD 1.75 Billion 6.050% Senior Unsecured Notes Due 2025 Receivables, Net Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Current Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Noncurrent Other assets Assets for Plan Benefits, Defined Benefit Plan Income taxes payable Accrued Income Taxes, Current Stock option exercises, net of tax Stock Issued During Period, Value, Stock Options Exercised 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] Schedule of Estimated Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Definite-lived Intangible Assets Intangible Assets, Finite-Lived, Policy [Policy Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Change in Projected Benefit Obligation Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Income tax (provision) benefit Income tax provision (benefit) Income Tax Expense (Benefit) Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Discontinued operations - basic (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Demerger obligations (Note 19) Demerger obligations Demerger obligations. Senior unsecured notes Unsecured Debt Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Designated as Hedging Instrument [Member] Designated as Hedging Instrument [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Gross asset value Property, Plant and Equipment, Gross Master Discounting Agreement Master Discounting Agreement [Member] Master Discounting Agreement Discontinued Operations and Disposal Groups [Abstract] Schedule of Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Schedule of Weighted Average Target Asset Allocations Schedule of Weighted-average Target Asset Allocations [Table Text Block] Schedule of Weighted-average Target Asset Allocations [Table Text Block]. Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired U.S. - Federal Income Tax Paid, Federal, after Refund Received Buildings and building improvements Building and Building Improvements [Member] 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] Debt Instrument, Redemption Price, Percentage Debt Instrument, Redemption Price, Percentage Class of Treasury Stock [Table] Class of Treasury Stock [Table] Loss Contingencies Commitments and Contingencies, Policy [Policy Text Block] Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Deferred Tax Liabilities Deferred Tax Liabilities, Gross [Abstract] Accumulated benefit obligation Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Amounts Recognized in the Consolidated Balance Sheets Consist of: Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] Repayments of short-term borrowings Repayments of Short-Term Debt Debt Instrument, Term Debt Instrument, Term Property, Plant and Equipment, Useful Life Property, Plant and Equipment, Useful Life Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Subsequent Event [Member] Subsequent Event [Member] 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] PEO Total Compensation Amount PEO Total Compensation Amount Depreciation expense Depreciation Money Market Funds [Member] Money Market Funds [Member] 2029 Finance Lease, Liability, to be Paid, Year Four Gross amount recognized Derivative Liability, Subject to Master Netting Arrangement, before Offset Swaps [Member] Swap [Member] Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Active sites Active sites Active sites. Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Pension plan assets, fair value non-financial receivables Pension Plan Assets, Fair Value Non-Financial Receivables Pension Plan Assets, Fair Value Non-Financial Receivables. Nutrinova Joint Venture Nutrinova Joint Venture [Member] Food Ingredients joint venture under the name Nutrinova Number of Reportable Segments Number of Reportable Segments Schedule of Operating Leased Assets [Table] Schedule of Operating Leased Assets [Table] Entity Address, State or Province Entity Address, State or Province Financing cash flows from finance leases Finance Lease, Principal Payments Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Common stock dividends Dividends, Common Stock 2029 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Euro Euro Member Countries, Euro Total current liabilities Total due to affiliates Liabilities, Current Operating Leased Assets [Line Items] Operating Leased Assets [Line Items] Inventory Deferred Tax Assets, Inventory Individual: Individual [Axis] Total liabilities [Member] Total plan liabilities [Member] Total plan liabilities [Member]. Defined contribution plans Defined Contribution Plan, Cost Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Percentage of US and international fair value of plan assets Defined Benefit Plan Assets Percentage Percentage of US and international plan assets Finance lease obligations Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions Accounting Changes and Error Corrections [Abstract] Common stock dividends Payments of Ordinary Dividends, Common Stock Document Annual Report Document Annual Report Entities [Table] Entities [Table] Settlements Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement Mechelen, Belgium Mechelen, Belgium [Member] Mechelen, Belgium Defined Benefit Plan, Cash and Cash Equivalents [Member] Defined Benefit Plan, Cash and Cash Equivalents [Member] Maximum exposure to loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount China, Europe Japan and Singapore Factoring Agreements China, Europe, Japan and Singapore Factoring Agreements [Member] China, Europe, Japan and Singapore Factoring Agreements Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Repayments of long-term debt Repayments of Long-Term Debt Entity Interactive Data Current Entity Interactive Data Current CNCC Working Capital Loan Agreement Due December 25, 2026 [Member] CNCC Working Capital Loan Agreement Due December 25, 2026 [Member] Celanese (Nanjing) Chemical Co., Ltd ("CNCC") senior unsecured working capital loan agreement with a borrowing capacity of CNY 800 million, maturing on December 25, 2026. Schedule of Estimated Useful Lives of Depreciable Assets Schedule of Estimated Useful Lives of Depreciable Assets [Table Text Block] Schedule of Estimated Useful Lives of Depreciable Assets [Table Text Block]. Settlement of cross-currency swap agreement Proceeds from Derivative Instrument, Investing Activities Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Foreign currency translation, gross amount Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Funded status as of end of period Defined Benefit Plan, Funded (Unfunded) Status of Plan Divestiture obligations (Note 19) Divestiture obligations Divestiture obligations. Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Current installments of long-term debt Current installments of long-term debt Long-Term Debt and Lease Obligation, Current Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Property, Plant and Equipment by Type [Axis] Long-Lived Tangible Asset [Axis] Pension curtailments and settlements, net Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment Ownership [Domain] Ownership [Domain] Distributions/dividends to noncontrolling interests Proceeds from (Payments to) Noncontrolling Interests Pension and postretirement net periodic benefit cost Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash 2027 Finance Lease, Liability, to be Paid, Year Two Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Other assets Other Assets, Noncurrent Interest (Note 11) Interest Payable, Current Entity Central Index Key Entity Central Index Key Insurance Contracts [Member] Insurance Contracts Investments [Member] Insurance Contracts Investments [Member]. PEO Name PEO Name Sales and other credits Revenues Schedule of Principal Payments Schedule of Maturities of Long-Term Debt [Table Text Block] Error Correction [Table] Error Correction [Table] 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] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Curtailment (gain) loss Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment Currency Swap [Member] Currency Swap [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Defined Benefit Plan [Table] Defined Benefit Plan [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Work-in-process Inventory, Work in Process, Net of Reserves Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Amounts attributable to Celanese Corporation Income Amounts Attributable to Parent, Disclosures [Abstract] Class of Stock [Domain] Class of Stock [Domain] InfraServ GmbH & Co. Gendorf KG InfraServ GmbH & Co. Gendorf KG [Member] InfraServ GmbH & Co. Gendorf KG [Member]. Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Income tax provision computed at U.S. federal statutory tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Subsequent Event Type [Axis] Subsequent Event Type [Axis] November 2024 US Term Loan Credit Agreement November 2024 US Term Loan Credit Agreement [Member] November 2024 U.S. Term Loan Credit Agreement for up to $1.0 billion; due 364 days from borrowing. Bearing an interest rate equal to the Secured Overnight Financing Rate with an interest period of one or three months ("Term SOFR") plus a margin of 1.300% to 2.250% per annum, or the base rate plus a margin of 0.300% to 1.250%; based on the Company's senior unsecured debt rating. Chinese yuan China, Yuan Renminbi Statement of Financial Position Location, Balance [Axis] Statement of Financial Position Location, Balance [Axis] Postretirement Health Coverage [Member] Postretirement Health Coverage [Member] 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Deferred Tax Assets Deferred Tax Assets, Net [Abstract] Amounts reclassified from accumulated other comprehensive income (loss) Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Gross asset value Gross asset value Finite-Lived Intangible Assets, Gross 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] Indemnification Agreements Hoechst [Member] Indemnification Agreements Hoechst [Member] Indemnification Agreements Hoechst [Member]. Entity Address, Address Line One Entity Address, Address Line One Research and development expenses Research and Development Expense Research and Development Expense Accumulated Other Comprehensive Income (Loss), Net AOCI Attributable to Parent [Member] Allowance for credit losses - third party and affiliates Accounts Receivable, Allowance for Credit Loss, Current Special termination benefits Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits Micromax Micromax [Member] Micromax® portfolio of products Cantonal taxes Effective Income Tax Rate Reconciliation, Cantonal Tax Rate, Amount Effective Income Tax Rate Reconciliation, Cantonal Tax Rate, Amount Ownership [Axis] Ownership [Axis] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Schedule of Percentage of US and International Fair Value of Plan Assets Schedule of Percentage of US and International Fair Value of Plan Assets [Table Text Block] Schedule of Percentage of US and International Fair Value of Plan Assets [Table Text Block]. Registered Investment Companies [Member] Exchange Traded Funds [Member] Defined Benefit Plan, Equity Securities, US Defined Benefit Plan, Equity Securities, US [Member] Disposal Group, Held-for-Sale, Not Discontinued Operations Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] Net operating loss carryforwards Operating Loss Carryforwards Changes in unrecognized tax benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Amount CSIT Revolving Credit Agreement CSIT Revolving Credit Agreement [Member] Celanese (Shanghai) International Trading Co., Ltd ("CSIT") revolving credit agreement with a borrowing capacity of CNY 550 million, maturing on January 13, 2026. Schedule of Long-term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Incremental shares attributable to equity awards Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Foreign Currency Contract, Asset, Fair Value Disclosure Foreign Currency Contract, Asset, Fair Value Disclosure Deferred Income Taxes and Tax Credits Deferred Income Taxes and Tax Credits Long-term debt, including current installments of long-term debt, fair value Long-Term Debt, Fair Value Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] CYPRUS CYPRUS 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Schedule of Percentage of US and International Projected Benefit Obligation Schedule of Percentage of US and International Projected Benefit Obligation [Table Text Block] Schedule of Percentage of US and International Projected Benefit Obligation [Table Text Block]. Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Yncoris GmbH & Co. KG YNCORIS GmbH & Co. KG [Member] YNCORIS GmbH & Co. KG [Member] Germany GERMANY Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount 2028 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Non-PEO NEO Non-PEO NEO [Member] BRAZIL BRAZIL Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] Schedule of Environmental Ownership and Liability Percentages Schedule of Environmental Ownership and Liability Percentages [Table Text Block] Schedule of Environmental Ownership and Liability Percentages [Table Text Block]. December 2025 Tender Offers December 2025 Tender Offers [Member] The December 2025 Tender offers by Celanese were completed on December 17, 2025 for $1.2 billion in aggregate principal amounts of senior unsecured notes. Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Covenants Not to Compete and Other Other Intangible Assets [Member] Land Land [Member] Offsetting Assets Offsetting Assets [Table Text Block] All Award Types Award Type [Domain] Investments in and Advances to Affiliates [Abstract] Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Noncontrolling interests Balance as of the beginning of the period, noncontrolling interest Balance as of the end of the period, noncontrolling interest Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Leasehold Improvements Leasehold Improvements [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Total Effect of cross-border tax laws Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Percent Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] CANADA CANADA Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Thereafter Unrecorded Unconditional Purchase Obligation, to be Paid, after Year Five Deferred Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] SWITZERLAND SWITZERLAND Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Company-wide Business Optimization Projects Company-wide Business Optimization Projects [Member] Company-wide Business Optimization Projects Other equity securities without readily determinable fair value investee [Member] Other Equity Securities without readily determinable fair value Investee [Member] Other Equity Securities without readily determinable fair value Investee [Member]. Foreign currency forwards and swaps Foreign Exchange Contract [Member] Foreign Exchange Contract [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Retirement Plan Type [Domain] Retirement Plan Type [Domain] March 2025 Tender Offers March 2025 Tender Offers [Member] The March 2025 Tender offers by Celanese were completed on March 21, 2025 for €552 million and $500 million in aggregate principal amounts of senior unsecured notes. China CHINA Schedule of Investments [Line Items] Schedule of Investments [Line Items] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Net amount presented in the consolidated balance sheets Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Foreign tax rate differential Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Subpart F Effective Income Tax Rate Reconciliation, Subpart F, Percent Effective Income Tax Rate Reconciliation, Subpart F, Percent Equity Securities International To Plans [Member] Equity Securities International To Plans [Member] Equity Securities International To Plans [Member]. Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Accumulated other comprehensive income (loss), net Accumulated Other Comprehensive Income (Loss), Net of Tax Long-term debt, net of unamortized deferred financing costs Long-Term Debt and Lease Obligation BELGIUM BELGIUM Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] 2026 Long-Term Debt, Maturity, Year One Financial Instruments [Domain] Financial Instruments [Domain] Total Deferred Tax Liabilities, Gross 2030 Long-Term Debt, Maturity, Year Five Schedule of Indefinite-Lived Intangible Assets, Net Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Europe and Africa EMEA [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Inventories Total Inventory, Net Developed Technology Developed Technology Rights [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Sales and use tax/foreign withholding tax payable Sales and Excise Tax Payable, Current Health care cost trend ultimate rate year Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate Company Selected Measure Name Company Selected Measure Name Total Reserves Accrual for Environmental Loss Contingencies Debt Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Trade payables - third party and affiliates Accounts Payable, Current Operating cash flows from operating leases Operating Lease, Payments Indonesian rupiah Indonesia, Rupiahs Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Total other comprehensive income (loss), gross amount Other Comprehensive Income (Loss), before Tax Number of Equity Method Investments Without Readily Determinable Fair Values Number of Equity Method Investments Without Readily Determinable Fair Values Represents the number of Equity Method Investments Without Readily Determinable Fair Values that the Company has ownership interests in. Other (charges) gains, net Other Nonrecurring (Income) Expense Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] International Current Foreign Tax Expense (Benefit) Goodwill Goodwill [Roll Forward] Restructuring Plan [Domain] Restructuring Plan [Domain] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Weighted average shares - diluted (in shares) Weighted average shares - diluted Weighted Average Number of Shares Outstanding, Diluted Weighted average interest rate, short-term borrowings Short-Term Debt, Weighted Average Interest Rate, at Point in Time Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Derivative [Table] Derivative [Table] Small Reporting Company Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Total amount of interest expense (benefit) and penalties recognized in the consolidated statements of operations(1) Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense HONG KONG HONG KONG Senior unsecured notes due 2026, interest rate of 1.400% USD Senior Unsecured Notes Due 2026 [Member] USD Senior Unsecured Notes Due 2026 [Member] U.S. - State Current State and Local Tax Expense (Benefit) Document Transition Report Document Transition Report Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Consolidated Ventures Consolidated Ventures [Member] Consolidated Ventures Brazilian real Brazil, Brazil Real Total lease payments Finance Lease, Liability, to be Paid Underlying Securities Award Underlying Securities Amount Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, before Tax Renewals Finite-Lived Intangible Assets, Cost Incurred to Renew or Extend Schedule of Contributions to Defined Contribution Plans Defined Contribution Plan Disclosures [Table Text Block] Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Defined Benefit Plan by Plan Liability Categories [Axis] Defined Benefit Plan by Plan Liability Categories [Axis] Defined Benefit Plan by Plan Liability Categories [Axis]. Noncurrent Other assets, consisting of insurance contracts Insurance contracts in nonqualified pension trusts, fair value Cash Surrender Value, Fair Value Disclosure Income Taxes Income Tax Disclosure [Text Block] UNITED KINGDOM UNITED KINGDOM Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Schedule of Investments [Table] Schedule of Investments [Table] Short-term lease cost Short-Term Lease, Cost Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Total equity Balance as of the end of the period Balance as of the beginning of the period Equity, Including Portion Attributable to Noncontrolling Interest Average purchase price per share Shares Acquired, Average Cost Per Share Document Type Document Type Unobservable Inputs (Level 3) [Member] Fair Value, Inputs, Level 3 [Member] Earnings (Loss) Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Additional paid-in capital Additional Paid in Capital Schedule of Company's Pension and Post Retirement Benefit Plans Schedule of Defined Benefit Plans Disclosures [Table Text Block] Variable lease cost Variable Lease, Cost Net sales Revenue from Contract with Customer, Excluding Assessed Tax Other changes Restructuring Reserve, Accrual Adjustment Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Share repurchase plan, authorized repurchase amount Share Repurchase Program, Authorized, Amount Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Disposal Group Name [Axis] Disposal Group Name [Axis] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Marketable securities Marketable Securities, Current Senior unsecured term loan due 2027(2) Senior Unsecured Term Loan Due 2027 [Member] Senior Unsecured Term Loan Due 2027 Entity Information [Line Items] Entity Information [Line Items] Current Liabilities Liabilities, Current [Abstract] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Schedule of Changes in Fair Value of Derivatives Derivative Instruments, Gain (Loss) [Table Text Block] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Fair Value, Inputs, Level 1 [Member] Gain (loss) on disposition of businesses and assets, net Gain (loss) on disposition of businesses and assets, net Gain (Loss) on Disposition of Assets Net earnings (loss) - diluted (in dollars per share) Earnings Per Share, Diluted Trade receivables - third party and affiliates, net Trade receivables - third party and affiliates, net Trade receivables - third party and affiliates Accounts Receivable, after Allowance for Credit Loss, Current Accelerated depreciation expense Restructuring and Related Cost, Accelerated Depreciation Schedule of Principal Weighted Average Assumptions Used to Determine Benefit Obligations and Benefit Cost Defined Benefit Plan, Assumptions [Table Text Block] Transfer of financial assets accounted for as sales, amount derecognized Transfer of Financial Assets Accounted for as Sales, Amount Derecognized U.S. tax effect of foreign earnings and dividends Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount Equity Securities, FV-NI and without Readily Determinable Fair Value Equity Securities, FV-NI and without Readily Determinable Fair Value Balance as of the beginning of the period (in shares) Balance as of the end of the period (in shares) Treasury Stock, Common, Shares U.S. - State Income Tax Paid, State and Local, after Refund Received Consolidation Items [Domain] Consolidation Items [Domain] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Earnings (loss) from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Auditor Location Auditor Location Uentrop, Germany Uentrop, Germany [Member] Polyamide 66 and High-Performance Nylon polymerization units at the Company's facility in Uentrop, Germany. Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Goodwill impairment losses Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount (Income) expense not resulting in tax impact, net (Income) expense not resulting in tax impact (Income) expense not resulting in tax impact. Gross profit Gross Profit Gross Profit Net actuarial (gain) loss Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) US Federal [Member] Domestic Tax Jurisdiction [Member] Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant Less amounts representing interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Intangible assets, net Disposal Group, Including Discontinued Operation, Intangible Assets Investment in affiliates (Note 7) Equity Method Investment Liability, Current Equity Method Investment Liability, Current Taxes paid, net of refunds Income Taxes Paid, Net Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Environmental Environmental Loss Contingency Disclosure [Text Block] Projected benefit obligation Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Two Assets held for sale Current assets Disposal Group, Including Discontinued Operation, Assets, Current Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Increase (decrease) in accrued capital expenditures Increase (Decrease) of Accrued Capital Expenditures Increase (Decrease) of Accrued Capital Expenditures. Salaries and benefits Employee-related Liabilities, Current Property, Plant and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Total lease payments Lessee, Operating Lease, Liability, to be Paid Senior unsecured notes due 2027, interest rate of 6.665%(1) USD Senior Unsecured Notes Due 2027 [Member] USD 2 Billion 6.165% Senior Unsecured Notes Due 2027 Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest Distributions/dividends to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Schedule of Current Other Liabilities Other Current Liabilities [Table Text Block] Pension and postretirement benefits, gross amount Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax KOREA, REPUBLIC OF KOREA, REPUBLIC OF Intersegment [Member] Intersegment Eliminations [Member] Expiration Date Trading Arrangement Expiration Date Ownership percentage Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Other liabilities Increase (Decrease) in Other Operating Liabilities Equity Affiliates EUR Debt Obligations Equity Affiliates EUR Debt Obligations [Member] Equity Affiliates EUR Debt Obligations 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Five Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Exchange rate changes Indefinite-Lived Intangible Assets, Foreign Currency Translation Gain (Loss) Schedule of Equity Method Investments Equity Method Investments [Table Text Block] Property, plant and equipment, net Net book value(1) Property, Plant and Equipment, Net Additions Restructuring Charges Restructuring Charges 2026 Unrecorded Unconditional Purchase Obligation, to be Paid, Year One Indian rupee India, Rupees Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Investments in and Advances to Affiliates, Schedule of Investments [Abstract] Investments in and Advances to Affiliates, Schedule of Investments [Abstract] Other Other [Member] Other Inventories Inventory, Policy [Policy Text Block] Restructuring Cost [Table] Restructuring Cost [Table] Europe Factoring Agreements Europe Factoring Agreements [Member] Europe Factoring Agreements Entity Current Reporting Status Entity Current Reporting Status Receivables [Abstract] Receivables [Abstract] Derivative [Line Items] Derivative [Line Items] Senior unsecured notes due 2028, interest rate of 6.850%(1) USD Senior Unsecured Notes Due 2028 [Member] USD 1 Billion 6.350% Senior Unsecured Notes Due 2028 Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Consolidated Entities [Domain] Consolidated Entities [Domain] JAPAN JAPAN Income tax provision computed at U.S. federal statutory tax rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount (Gain) loss on disposition of businesses and assets, net Gain (Loss) on Disposition of Property Plant Equipment Financial Instrument [Axis] Financial Instrument [Axis] Investments in Affiliates Investments in and Advances to Affiliates, Schedule of Investments [Text Block] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Canadian dollar Canada, Dollars State and local income tax, net of federal income tax effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Finance Lease, Liability, Current Finance Lease, Liability, Current Accumulated benefit obligation Defined Benefit Plan, Accumulated Benefit Obligation Proceeds from long-term debt Proceeds from Issuance of Long-Term Debt Interest expense Interest Expense, Operating and Nonoperating Current Fiscal Year End Date Current Fiscal Year End Date Health care cost trend rate assumed for next year Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Schedule of Trade Receivables - Third Party and Affiliates, Net Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Transfer to assets held for sale (Note 4) Goodwill, Transfers INDIA INDIA Net amount Derivative liability Derivative Liability Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] EPA Estimated Cost environmental Loss exposure for environmental contingencies at an individual site for which no accrual has been recorded based upon EPA determination. ITALY ITALY Total due from affiliates Receivables, Net, Current Dividends and other distributions Proceeds from Equity Method Investment, Distribution Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] As of the beginning of the year As of the end of the year Unrecognized Tax Benefits Site Contingency [Line Items] Site Contingency [Line Items] 5.000% Senior Notes due 2031 Senior unsecured notes due 2031, interest rate of 5.000% EUR Senior Unsecured Notes Due 2031 [Member] EUR 750 Million 5.000% Senior Unsecured Notes Due 2031 Antidilutive securities excluded from computation of earnings per share, amount (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Senior unsecured notes due 2029, interest rate of 6.830%(1) USD Senior Unsecured Notes Due 2029 [Member] USD 750 Million 6.330% Senior Unsecured Notes Due 2029 Unrecorded Unconditional Purchase Obligation, Including Lease Not yet Commenced, Total Unrecorded Unconditional Purchase Obligation Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Other Liabilities, Current [Abstract] Other Liabilities, Current [Abstract] 2027 Long-Term Debt, Maturity, Year Two Financial Guarantee Financial Guarantee [Member] Gain (Loss) On Non-Derivative Used In Net Investment Hedge Gain (Loss) On Non-Derivative Used In Net Investment Hedge Adjustment in other comprehensive income reflecting gains or losses on foreign currency transactions that are designated as, and are effective as, hedges of net investment in foreign entity, gross of tax effect. Leases Lessee, Operating Leases [Text Block] Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Measure: Measure [Axis] Transfer Of Financial Assets Treated As Sales, Non-recourse or Limited recourse Basis, Accounts Receivable Percentage Transfer Of Financial Assets Treated As Sales, Non-recourse or Limited recourse Basis, Accounts Receivable Percentage The percentage of accounts receivable, treated as Sales, transferred on a non-recourse or limited recourse basis, as part of a factoring or discounting agreement. Uncertain tax positions Liability for Uncertainty in Income Taxes, Noncurrent AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member] 2027 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Two Exchange rate changes Goodwill, Foreign Currency Translation and Measurement Period Adjustments Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Stock awards Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Cost of sales Cost of sales Cost of Product and Service Sold Disposal Group Classification [Domain] Disposal Group Classification [Domain] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Amounts Recognized in Accumulated Other Comprehensive Income Consist of: Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [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 Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Percent British pound sterling United Kingdom, Pounds March 2025 Offering of Senior Unsecured Notes March 2025 Offering of Senior Unsecured Notes [Member] The March 2025 Offering of senior unsecured notes by Celanese completed on March 14, 2025. This offering consisted of: USD 700 Million 6.500% Senior Unsecured Notes Due 2030, EUR 750 Million 5.000% Senior Unsecured Notes Due 2031 and USD 1.1 Billion 6.750% Senior Unsecured Notes Due 2033. Common stock, shares issued (in shares) Common Stock, Shares, Issued Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Statement of Financial Position [Extensible Enumeration] Weighted-average remaining operating leases term Operating Lease, Weighted Average Remaining Lease Term 2029 Long-Term Debt, Maturity, Year Four Goodwill and Intangible Assets, Net Goodwill and Intangible Assets Disclosure [Text Block] Entity Public Float Entity Public Float Schedule of Goodwill Schedule of Goodwill [Table Text Block] Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Dividends Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount Loss Contingencies [Line Items] Loss Contingencies [Line Items] Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] The Netherlands NETHERLANDS Security Exchange Name Security Exchange Name Foreign Income Tax Paid, Foreign, after Refund Received Other Effective Income Tax Rate Reconciliation, Cross-Border, Other, Percent Total Nontaxable or nondeductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Mortgage Backed Securities [Member] Collateralized Mortgage-Backed Securities [Member] China Factoring Agreements China Factoring Agreements [Member] China Factoring Agreements Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-Lived Intangible Assets, Major Class Name [Domain] Other liabilities Total Other Liabilities, Current Defined Benefit Plan, Plan Assets, Contributions by Plan Participant Defined Benefit Plan, Plan Assets, Contributions by Plan Participant Debt Instrument, Discount Price, Percentage Debt Instrument, Discount Price, Percentage Debt Instrument, Discount Price, Percentage Discount rate NPBC Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Other Other Sundry Liabilities, Current Liability, Defined Benefit Plan, Noncurrent Liability, Defined Benefit Plan, Noncurrent Statement [Line Items] Statement [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Schedule of Restructuring Reserve Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Ownership percentage Equity Securities without Readily Determinable Fair Value Ownership Percentage Equity Securities without Readily Determinable Fair Value Ownership Percentage. Deferred income taxes, net Increase (Decrease) in Deferred Income Taxes Common Stock Common Stock [Member] Finance Lease, Liability, Payment, Due [Abstract] Finance Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Short-term borrowings, including amounts due to affiliates(1) Other Short-Term Borrowings Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Mexico MEXICO Summary of Accounting Policies Significant Accounting Policies [Text Block] Statistical Measurement [Domain] Statistical Measurement [Domain] Other Current Assets [Member] Other Current Assets [Member] Prior service (benefit) cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax Later years Lessee, Operating Lease, Liability, to be Paid, after Year Five Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Foreign Plan [Member] Foreign Plan [Member] Goodwill impairment losses Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent Long-term Debt, Weighted Average Interest Rate, at Point in Time Long-Term Debt, Weighted Average Interest Rate, at Point in Time Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Indemnification ceiling amount Indemnification ceiling amount Ceiling amount above which the Company will indemnify Hoechst for. Singapore dollar Singapore, Dollars Other Noncurrent Assets Other Noncurrent Assets [Member] Interest Rate Swap [Member] Interest Rate Swap [Member] Tax Credit Carryforward, Expiration Date Tax Credit Carryforward, Expiration Date Equity in net earnings (loss) of affiliates Income (Loss) from Equity Method Investments Leases [Abstract] Leases [Abstract] Increases in tax positions for prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Earnings (loss) per common share - basic Earnings Per Share, Basic [Abstract] Pollution control and industrial revenue bonds due at various dates through 2030(3) Pollution Control and Industrial Revenue Bonds [Member] Pollution Control and Industrial Revenue Bonds [Member]. Trade payables - third party and affiliates Increase (Decrease) in Accounts Payable Schedule of Assets and Liabilities Classified as Held for Sale Disposal Groups, Including Discontinued Operations [Table Text Block] Type of Restructuring [Domain] Type of Restructuring [Domain] Singapore SINGAPORE Unrecorded Unconditional Purchase Obligations Disclosure Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block] CNCC Working Capital Loan Agreement Due July 3, 2028 [Member] CNCC Working Capital Loan Agreement Due July 3, 2028 [Member] Celanese (Nanjing) Chemical Co., Ltd ("CNCC") senior unsecured working capital loan agreement with a borrowing capacity of CNY 300 million, maturing on July 3, 2028. Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Net earnings (loss) - basic (in dollars per share) Earnings Per Share, Basic Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax One Time Termination Benefits Type [Domain] One Time Termination Benefits Type [Domain] One Time Termination Benefits Type [Domain] Schedule of Health Care Cost Trend Rates Schedule of Health Care Cost Trend Rates [Table Text Block] Schedule of Balances Available for Borrowing Schedule of Line of Credit Facilities [Table Text Block] Fair value of plan assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets Changes in unrecognized tax benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Subtotal Deferred Tax Assets, Gross Lease, Right-of-Use Asset Lease, Right-of-Use Asset Lease Right of Use Asset Discount rate obligations Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Total other comprehensive income (loss), net of tax Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Schedule of Business Segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Discontinued operations - diluted (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Benefit obligations Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent Revenue, remaining performance obligation, amount Revenue, Remaining Performance Obligation, Amount InfraServ GmbH & Co. Hoechst KG InfraServ Gmbh & Co. Hoechst KG [Member] InfraServ Gmbh & Co. Hoechst KG [Member]. 2028 Finance Lease, Liability, to be Paid, Year Three Indefinite-lived Intangible Assets [Line Items] Indefinite-Lived Intangible Assets [Line Items] Japanese Notes Due 2029 Japanese yen-denominated borrowing [Member] The amount of the 2023 Offering converted into a Japanese yen-denominated borrowing in August 2023. Matures July 15, 2029. Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Proceeds from sale of businesses and assets, net Proceeds from Sale of Productive Assets Research and Development Research and Development Expense, Policy [Policy Text Block] Foreign currency translation, income tax (provision) benefit Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Hedging Designation [Domain] Hedging Designation [Domain] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Current Assets Assets, Current [Abstract] Total liabilities and equity Liabilities and Equity Functional and Reporting Currencies Foreign Currency Transactions and Translations Policy [Policy Text Block] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Investments in affiliates Deferred Tax Liabilities, Investment in Noncontrolled Affiliates Pension and Postretirement Benefits [Member] Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Variable Interbank Interest Rate Variable Interbank Interest Rate [Member] Certain interbank rates at current Company credit ratings Trade taxes Effective Income Tax Rate Reconciliation, Trade Taxes, Percent Effective Income Tax Rate Reconciliation, Trade Taxes, Percent Licenses Licensing Agreements [Member] Amended Restated Receivable Purchasing Facility Amended Restated Receivable Purchasing Facility [Member] An accounts receivable purchasing facility which allows a wholly owned, bankruptcy-remote subsidiary to sell an undivided interest in a pool of trade receivables (received through contribution from certain subsidiaries that retain the responsibility of servicing the receivables) to financial institutions participating in the facility. Intangibles and other Deferred Tax Assets, Other Equity Method Investment [Table] Equity Method Investment [Table] Debt Instrument, Interest Rate, Increase (Decrease) Debt Instrument, Interest Rate, Increase (Decrease) Capital expenditures Segment, Expenditure, Addition to Long-Lived Assets Investments in and Advances to Affiliates [Line Items] Investments in and Advances to Affiliates [Line Items] Accounting Policies [Abstract] Accounting Policies [Abstract] Lessee, Operating Lease, Liability, Maturity [Table Text Block] Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] China Revolving Credit Facility China Revolving Credit Facility [Member] Arrangement in which loan proceeds can continuously be obtained following repayments, but the total amount borrowed cannot exceed a specified maximum amount. Treasury Stock, Common Treasury Stock, Common [Member] Earnings (loss) from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Pay vs Performance Disclosure [Line Items] Total Operating Lease, Liability Asset transfers between wholly-owned foreign affiliates Effective Income Tax Rate Reconciliation, Asset Transfers Between Wholly Owned Foreign Affiliates, Percent Effective Income Tax Rate Reconciliation, Asset Transfers Between Wholly Owned Foreign Affiliates, Percent Amortization of leased assets Finance Lease, Right-of-Use Asset, Amortization Gain (loss) on cash flow hedges, income tax (provision) benefit Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax Other liabilities Other Liabilities, Noncurrent Site Contingency [Table] Site Contingency [Table] Impairment losses Impairment losses Goodwill, Impairment Loss Lanaken, Belgium Lanaken, Belgium [Member] Lanaken, Belgium Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Employer contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Debt Issuance Costs, Gross Debt Issuance Costs, Gross Comprehensive income (loss) attributable to Celanese Corporation Comprehensive Income (Loss), Net of Tax, Attributable to Parent Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Schedule of Earnings (Loss) from Continuing Operations Before Tax by Jurisdiction Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Secured Debt Secured Debt [Member] Proceeds collected on accounts receivable sold under factoring facilities Proceeds Collected on Accounts Receivable Sold under Factoring Facilities Proceeds Collected on Accounts Receivable Sold under Factoring Facilities Net operating loss carryforward expiration Operating Loss Carryforwards, Expiration Date Finite-Lived intangible Assets Rollforward Finite-Lived Intangible Assets [Roll Forward] Deferred income taxes Deferred Income Tax Liabilities, Net Expected return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets Exchange rate changes Finite-Lived Intangible Assets, Translation and Purchase Accounting Adjustments Earnings (loss) from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Cantonal taxes Effective Income Tax Rate Reconciliation, Cantonal Tax Rate, Percent Effective Income Tax Rate Reconciliation, Cantonal Tax Rate, Percent Deferred Tax Assets, Tax Credit Carryforwards, Foreign Deferred Tax Assets, Tax Credit Carryforwards, Foreign Equity income and dividends Income Tax Reconciliation, Equity Income and Dividends Income Tax Reconciliation, Equity Income and Dividends. Schedule of Cash Tender Offer Schedule of Cash Tender Offer [Table Text Block] Schedule of Cash Tender Offer Long-term debt, including current installments of long-term debt, carrying amount Long-Term Debt Schedule of Components of Other Comprehensive Income (Loss), Net Comprehensive Income (Loss) [Table Text Block] Engineered Materials Engineered Materials [Member] Engineered Materials Total assets Assets Total assets Assets Schedule of Health Care Cost Trend [Table] ScheduleofHealthCareCostTrend [Table] Schedule of health care cost trend rate assumptions Euro Notes Due 2030 Euro denominated borrowing Due 2030 [Member] Euro denominated borrowing Due 2030 Schedule of Notional Amounts of Net Foreign Exchange Exposure by Currency Schedule of Notional Amounts of Net Foreign Exchange Exposure by Currency [Table Text Block] Schedule of Notional Amounts of Net Foreign Exchange Exposure by Currency [Table Text Block]. 2026 Finite-Lived Intangible Asset, Expected Amortization, Year One Plant Shutdown Costs Plant Shutdown Costs Amount of plant shutdown and exit costs Japanese yen Japan, Yen Geographical [Domain] Geographical [Domain] Income Taxes Income Tax, Policy [Policy Text Block] Other segment items(2) Segment Reporting, Other Segment Item, Amount Schedule of Expense Related to Nonqualified Pension Plans Included in Net Periodic Benefit Cost, Excluding Returns on Assets Schedule of Nonqualified Pension Plans Expense [Table Text Block] Schedule of Nonqualified Pension Plans Expense [Table Text Block]. Discount rate NPBC - service cost Defined Benefit Plan, Assumptions Used in Calculating Net Periodic Benefit Cost, Discount Rate for Service Cost The interest rate used to adjust for the time value of money for service cost. Inventories Inventory Disclosure [Text Block] Schedule of Nonqualified Pension Plans Funded with Nonqualified Trusts Schedule of Nonqualified Pension Plans [Table Text Block] Schedule of Nonqualified Pension Plans [Table Text Block]. Investments in and Advances to Affiliates, Activity [Line Items] Investments in and Advances to Affiliates, Activity [Line Items] 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Four 2026 Finance Lease, Liability, to be Paid, Year One Quarterly cash dividend per share Common Stock, Dividends, Per Share, Declared Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding ROU assets obtained in exchange for operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Asset transfers between wholly-owned foreign affiliates Effective Income Tax Rate Reconciliation, Asset Transfers Between Wholly Owned Foreign Affiliates, Amount Effective Income Tax Rate Reconciliation, Asset Transfers Between Wholly Owned Foreign Affiliates, Amount Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax Asset and investment impairment Effective Income Tax Rate Reconciliation, Asset And Investment Impairment, Amount Effective Income Tax Rate Reconciliation, Asset And Investment Impairment, Amount Senior unsecured notes due 2031, interest rate of 7.000% USD Senior Unsecured Notes Due 2031 [Member] USD 600 Million 7.000% Senior Unsecured Notes Due 2031 Significant Other Observable Inputs (Level 2) [Member] Fair Value, Inputs, Level 2 [Member] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] State income taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Swedish krona Sweden, Kronor Carrying value Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Lessee, Operating Lease, Liability, Payment, Due [Abstract] Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Related Party Related Party [Member] Change in Plan Assets Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Schedule of Income Tax Provision (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Other (Charges) Gains, Net Schedule of Other (Charges) Gains, Net [Table Text Block] Schedule of Other (Charges) Gains, Net [Table Text Block]. Property, Plant and Equipment, Net Property, Plant and Equipment, Policy [Policy Text Block] PEO PEO [Member] Schedule of Health Care Cost Trend [Line Items] ScheduleofHealthCareCostTrend [Line Items] [Line Items] for Schedule of health care cost trend rate assumptions Gain (loss) on derivative hedges Gain (loss) on cash flow hedges, net amount Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments and Tax Number of divestiture agreements Number of divestiture agreements Number of divestiture agreements. Common Stock, Dividends, Decrease, Percentage Common Stock, Dividends, Decrease, Percentage Percentage decrease of new quarterly dividend payment per share as approved by the Board of Directors. Employee Termination Benefits [Member] Employee Severance [Member] Global intangible low-taxed income Effective Income Tax Rate Reconciliation, GILTI, Amount Other Securities [Member] Other Securities [Member] Other Securities [Member]. Interest income Investment Income, Interest One Time Termination Benefits Type [Axis] One Time Termination Benefits Type [Axis] One Time Termination Benefits Type March 2022 U.S. Term Loan Credit Facility March 2022 U.S. Term Loan Credit Agreement [Member] March 2022 U.S. Term Loan Credit Agreement UNITED STATES UNITED STATES Other Activities Other [Member] Corporate Segment and Other Operating Segment [Member] 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] Senior unsecured notes due 2033, interest rate of 6.750% USD 1.1B Senior Unsecured Notes Due 2033 [Member] USD 1.1 Billion 6.750% Senior Unsecured Notes Due 2033 Land improvements Land Improvements [Member] Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Depreciation and amortization Deferred Tax Liabilities, Property, Plant and Equipment Retained Earnings Retained Earnings [Member] Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] Cash and cash equivalents Cash and cash equivalents as of beginning of period Cash and cash equivalents as of end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Net amount Derivative Asset Derivative Asset Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Continuing operations - diluted (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Total Notional amount of foreign currency derivatives, net Notional amount of foreign currency derivatives, net. Net earnings (loss) Net earnings (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Liabilities, Fair Value Disclosure Liabilities, Fair Value Disclosure Business Combination [Table] Business Combination [Table] Notional Value Derivative, Notional Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Equity affiliates USD debt obligations Equity Affiliates USD Debt Obligations [Member] Equity Affiliates USD Debt Obligations Schedule of Non-trade Receivables, Net Schedule of Non-trade Receivables, Net [Table Text Block] Schedule of Non-trade Receivables, Net [Table Text Block]. City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Capitalized interest Interest Costs Capitalized Inventory Deferred Tax Liabilities, Inventory Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Property, plant and equipment, net Long-Lived Assets Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Fair Value Hedging Fair Value Hedging [Member] Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Actuarial (gain) loss on pension and postretirement plans Defined Benefit Plan, Amortization of Gain (Loss) Total net lease cost Lease, Cost Interest Crediting Rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate Cash Flow Hedging [Member] Cash Flow Hedging [Member] Goodwill Goodwill, beginning balance Goodwill, ending balance Goodwill Lease, Cost [Table Text Block] Lease, Cost [Table Text Block] Tangible Asset Impairment Charges Tangible Asset Impairment Charges Fair value of plan assets Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets U.S. – Federal Deferred Federal Income Tax Expense (Benefit) Benefit obligations Liability, Defined Benefit Pension Plan, Noncurrent Activity Related To Uncertain Tax Positions [Roll Forward] Unrecognized Tax Benefits [Roll Forward] Auditor Name Auditor Name Operating Lease, Lease Not yet Commenced Operating Lease, Lease Not yet Commenced [Member] Discount rate NPBC - interest cost Defined Benefit Plan, Assumptions Used in Calculating Net Periodic Benefit Cost, Discount Rate for Interest Cost The interest rate used to adjust for the time value of money for interest cost. Net actuarial (gain) loss Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax Supplemental Cash Flow Information [Abstract] Supplemental Cash Flow Information [Abstract] Valuation allowance offset for State net operating loss carryforwards due to uncertain recoverability Operating Loss Carryforwards, Valuation Allowance Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Goodwill, Impaired, Accumulated Impairment Loss Goodwill, Impaired, Accumulated Impairment Loss Other Performance Measure, Amount Other Performance Measure, Amount Short-term borrowings and current installments of long-term debt - third party and affiliates Total Debt, Current Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Pension and Other Postretirement Obligations Pension and Other Postretirement Plans, Policy [Policy Text Block] Related and Nonrelated Parties [Domain] Related and Nonrelated Parties [Domain] Assets and liabilities, lessee [Table Text Block] Assets and liabilities, lessee [Table Text Block] Assets and liabilities, lessee [Table Text Block] Other Current Liabilities [Member] Other Current Liabilities [Member] Amount Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Derivative, by Nature [Axis] Derivative Instrument [Axis] Derivative Instrument [Axis] Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Leases Lessee, Finance Leases [Text Block] Schedule of Accumulated Benefit Obligation for All Defined Benefit Pension Plans Schedule of Accumulated and Projected Benefit Obligations [Table Text Block] Other assets Other Assets, Current Customer rebates Accrued Marketing Costs, Current Settlements Defined Benefit Plan, Plan Assets, Payment for Settlement Net cash provided by (used in) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Investments in affiliates Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Revenue, 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, net of amounts capitalized Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent Operating lease cost Operating Lease, Cost Decreases in tax positions for prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Supplemental lease information [Table Text Block] Supplemental lease information [Table Text Block] Supplemental lease information [Table Text Block] Percentage of projected benefit obligation Defined Benefit Plan Benefit Obligation Percentage Percentage of US and international projected benefit obligation. Stock option exercises (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Valuation allowance Deferred Tax Assets, Valuation Allowance North America [Member] North America [Member] Mobility & Materials Mobility & Materials [Member] Mobility & Materials ("M&M") Recoverability of Goodwill and Indefinite-Lived Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Defined Benefit Plan, Equity Securities, Non-US [Member] Defined Benefit Plan, Equity Securities, Non-US [Member] Senior unsecured notes due 2030, interest rate of 6.500% USD 700M Senior Unsecured Notes Due 2030 [Member] USD 700 Million 6.500% Senior Unsecured Notes Due 2030 Buildings and improvements Building [Member] Derivative and Hedging Instruments Derivatives, Policy [Policy Text Block] Segment Information Segment Reporting Disclosure [Text Block] Goodwill [Table] Goodwill [Table] 2028 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Three 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] Derivatives Not Designated as Hedges [Member] Not Designated as Hedging Instrument [Member] Treasuries, Other Debt [Member] US Treasury Securities [Member] Fair value of plan assets as of beginning of period Fair value of plan assets as of end of period Defined Benefit Plan, Plan Assets, Amount U.S. – Federal Current Federal Tax Expense (Benefit) Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Schedule of Net Periodic Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Benefit obligations (Note 12) Liability, Pension and Other Postretirement and Postemployment Benefits, Current Leases Lessee, Leases [Policy Text Block] Amortization of intangible assets Amortization of Intangible Assets Amortization of Intangible Assets Selling, general and administrative expenses Selling, General and Administrative Expense Selling, General and Administrative Expense Deferred income taxes Deferred Income Tax Assets, Net Other [Member] Other than Securities Investment [Member] Schedule of Adjustments to Accumulated Other Comprehensive Income (Loss), Net Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Depreciation and amortization Depreciation, Depletion and Amortization Other Currency Other Currency [Member] Settlement (gain) loss Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Number of Equity Method Investments Number of Equity Method Investments Represents the number of equity method investments the Company has ownership interests in. Revolving Credit Facility Revolving Credit Facility [Member] Refinancing expense Refinancing expense Deferred Debt Issuance Cost, Writeoff Foreign tax rate differential Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount CNCC Working Capital Loan Agreement Due June 9, 2028 [Member] CNCC Working Capital Loan Agreement Due June 9, 2028 [Member] Celanese (Nanjing) Chemical Co., Ltd ("CNCC") senior unsecured working capital loan agreement with a borrowing capacity of CNY 1.0 billion, maturing on June 9, 2028. Obligations under finance leases due at various dates through 2054 Total Finance Lease, Liability Acetyl Chain Acetyl Chain [Member] Acetyl Chain [Member] Arrangement Duration Trading Arrangement Duration Hungarian forint Hungary, Forint Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Segments [Axis] Segments [Axis] Immaterial Revision of Prior Period Financial Statements Comparability of Prior Year Financial Data, Policy [Policy Text Block] Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Trade receivables - third party and affiliates Accounts Receivable, before Allowance for Credit Loss, Current Other, net Payment for (Proceeds from) Other Investing Activity Other, net Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Thereafter Long-Term Debt, Maturity, after Year Five South America [Member] South America [Member] Restructuring and Related Cost, Expected Cost Restructuring and Related Cost, Expected Cost ASSETS Assets [Abstract] Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] Schedule of Capitalized Interest and Depreciation Expense Schedule of Capitalized Interest and Depreciation Expense [Table Text Block] Schedule of Capitalized Interest and Depreciation Expense [Table Text Block]. Fair Value Measurements Fair Value Disclosures [Text Block] Benefit Obligations Retirement Benefits [Text Block] Business Combination [Line Items] Business Combination [Line Items] Credit Facility [Domain] Credit Facility [Domain] Derivatives (Note 17) Derivative Liability, Current Proceeds from short-term borrowings Proceeds from Short-Term Debt Earnings (loss) from operation of discontinued operations Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax Purchases of treasury stock Amount spent on repurchased shares (in $ millions) Treasury Stock, Value, Acquired, Cost Method Interest Rate Debt Instrument, Interest Rate, Stated Percentage Investment, Name [Axis] Investment, Name [Axis] Operating lease liabilities Operating Lease, Liability, Noncurrent Entity Voluntary Filers Entity Voluntary Filers Divestiture Agreements [Member] Divestiture Agreements [Member] Divestiture Agreements [Member]. Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Gross amount recognized Derivative Asset, Subject to Master Netting Arrangement, before Offset Depreciation, amortization and accretion Depreciation, Amortization and Accretion, Net Property, Plant and Equipment [Abstract] Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Total Total Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities Exchange rate changes Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) Lease Liability Lease Liability Lease Liability Capital Loss Carryforwards Capital Loss Carryforwards Amount of capital loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Plan Liability Categories [Domain] Plan Liability Categories [Domain] Plan Liability Categories [Domain]. Assets, Fair Value Disclosure Assets, Fair Value Disclosure Revision of Prior Period [Domain] Revision of Prior Period [Domain] Carrying Value Equity Securities without Readily Determinable Fair Value, Amount Tax Credit Carryforward [Line Items] Tax Credit Carryforward [Line Items] Non-operating pension and other postretirement employee benefit (expense) income Non-operating pension and other postretirement employee benefit (expense) income Non-operating pension and other postretirement employee benefit (expense) income Machinery and equipment Machinery and Equipment [Member] Interest cost Defined Benefit Plan, Interest Cost Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Axis] Other Noncurrent Liabilities [Member] Other Noncurrent Liabilities [Member] Schedule of Finite-Lived Intangible Assets, Net Schedule of Finite-Lived Intangible Assets [Table Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Issuance of treasury stock under stock plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture International Deferred Foreign Income Tax Expense (Benefit) Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Schedule of Restructuring and Related Costs Restructuring and Related Costs [Table Text Block] Other (Charges) Gains, Net Other (Charges) Gains, Net [Text Block] Other (Charges) Gains, Net [Text Block]. Other, net Proceeds from (Payment for) Other Financing Activity Proceeds from sale of businesses and assets, net Payments For (Proceeds from) Sale of Business and Assets, net The net cash outflow or inflow from the sale of businesses, property, plant and equipment (capital expenditures), software, and other intangible assets. All Currencies [Domain] All Currencies [Domain] Legislative changes Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Name Trading Arrangement, Individual Name 1.250% Senior Notes due 2025 Senior unsecured notes due 2025, interest rate of 1.250% EUR Senior Unsecured Notes Due 2025 [Member] Senior Unsecured Notes Due 2025 [Member] Schedule of Short-term Debt [Table] Short-Term Debt [Table] Indemnification percentage, other Indemnification percentage, other Percentage of other liabilities the Company has agreed to indemnify Hoechst for as part of the Demerger Agreement. Debt Instrument, Repurchase Amount Debt Instrument, Repurchase Amount Debt Instrument, Face Amount Debt Instrument, Face Amount Pension and postretirement obligations Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pension and Postretirement Obligations Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pension and Postretirement Obligations. CNCC Working Capital Loan Agreement Due March 6, 2028 [Member] CNCC Working Capital Loan Agreement Due March 6, 2028 [Member] Celanese (Nanjing) Chemical Co., Ltd ("CNCC") senior unsecured working capital loan agreement with a borrowing capacity of CNY 750 million, maturing on March 6, 2028. Pension and postretirement benefits, income tax (provision) benefit Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Depreciation and amortization Deferred Tax Assets, Property, Plant and Equipment Senior unsecured notes due 2032, interest rate of 6.879%(1) USD Senior Unsecured Notes Due 2032 [Member] USD 1 Billion 6.379% Senior Unsecured Notes Due 2032 Income tax (provision) benefit from discontinued operations Discontinued Operation, Tax Effect of Discontinued Operation Equities [Member] Equity Funds [Member] Name Awards Close in Time to MNPI Disclosures, Individual Name Current Other Liabilities Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Cash payments Payments for Restructuring Restructuring Cost and Reserve [Axis] Restructuring Type [Axis] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Plant/office closures Plant Office Closures Plant office closures. ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities Passaic River, New Jersey [Member] Passaic River, New Jersey [Member] Passaic River, New Jersey [Member]. Stock-based compensation, net of tax APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Treasury stock, at cost Treasury Stock, Value Schedule of Senior Unsecured Notes Offering Schedule of Senior Unsecured Notes Offering [Table Text Block] Schedule of new senior unsecured notes offering in the period by the Company. Finance Lease, Liability, Maturity [Table Text Block] Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Pension plan assets, fair value non-financial payables Pension Plan Assets, Fair Value Non-Financial Payables Pension Plan Assets, Fair Value Non-Financial Payables. Foreign Tax Jurisdiction Foreign Tax Jurisdiction [Member] Auditor Firm ID Auditor Firm ID Dividends Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent Segments [Domain] Segments [Domain] Indemnification floor amount Indemnification floor amount The amount that the Company will indemnify Hoechst for in full. International Income (Loss) from Continuing Operations before Income Taxes, Foreign Short-term Debt [Member] Short-Term Debt [Member] Available for borrowing Line of Credit Facility, Remaining Borrowing Capacity Non-income taxes receivable Value Added Tax Receivable, Current Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Projected benefit obligation as of beginning of period Projected benefit obligation as of end of period Defined Benefit Plan, Benefit Obligation Statement of Financial Position Location, Balance [Domain] Statement of Financial Position Location, Balance [Domain] Revolving credit facilities(2) Line of Credit, Current Inventories Increase (Decrease) in Inventories Unrecognized Tax Benefit, Decrease resulting from changes in uncertain tax position and impacts of amended tax return filings Unrecognized Tax Benefit, Decrease Resulting From Changes in Uncertain Tax Position And Impacts Of Amended Tax Return Filings Unrecognized Tax Benefit, Decrease Resulting From Changes in Uncertain Tax Position And Impacts Of Amended Tax Return Filings Subpart F Effective Income Tax Rate Reconciliation, Subpart F, Amount Effective Income Tax Rate Reconciliation, Subpart F, Amount Derivative Asset [Abstract] Derivative Asset [Abstract] Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Subtotal Long-Term Debt and Lease Obligation, Including Current Maturities Disposition Finite-Lived Intangible Assets, Transferred Amount of transfers into (out of) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Revenue Recognition Revenue [Policy Text Block] Gross amount offset in the consolidated balance sheets Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Investments in and Advances to Affiliates [Table] Investments in and Advances to Affiliates [Table] Short-Term Borrowings and Current Installments of Long-Term Debt - Third Party and Affiliates Debt, Current [Abstract] Japan Factoring Agreements Japan Factoring Agreements [Member] Japan Factoring Agreements All Executive Categories All Executive Categories [Member] Schedule of Consolidated Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Pension Plans with Projected Benefit Obligations in Excess of Plan Assets Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets [Table Text Block] Finished goods Inventory, Finished Goods, Net of Reserves Common stock, $0.0001 par value, 400,000,000 shares authorized (2025: 170,918,221 and 2024: 170,827,196 issued) Common Stock, Value, Issued Finance lease, right-of-use asset Finance Lease, Right-of-Use Asset, after Accumulated Amortization Undistributed earnings in unconsolidated affiliates Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Euro Notes Due 2028 Euro Denominated Borrowing Due 2028 [Member] Euro Denominated Borrowing Due 2028 Commitments and Contingencies Commitments and Contingencies Goodwill, Impairment Loss, Discount Rate, Increase (Decrease) Goodwill, Impairment Loss, Discount Rate, Increase (Decrease) The incremental increase (decrease) in discount rate used in between the current year and prior year quantitative testing of goodwill. Business Combination [Axis] Business Combination [Axis] Raw materials and supplies Inventory, Raw Materials and Supplies, Net of Reserves Total comprehensive income (loss), net of tax Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Schedule of Environmental Disclosure [Table] Schedule of Environmental Disclosure [Table] Schedule of Environmental Disclosure [Table]. Bank loans due at various dates through 2030(4) Loans Payable [Member] Other Long-term debt Other Long-Term Debt Noncontrolling Interests Noncontrolling Interest [Member] Supplemental Employee Retirement Plan [Member] Supplemental Employee Retirement Plan [Member] Investments in Affiliates Equity Method Investments [Policy Text Block] Short-term Investments [Member] Short-Term Investments [Member] Equity Method Investment, Ownership Percentage Ownership percentage Equity Method Investment, Ownership Percentage Recent Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Various senior notes Various senior notes [Member] Various senior unsecured notes impacted by an increase of up to 50 basis points beginning in the years ended December 31, 2025 and 2026, as applicable. Short-term Debt [Line Items] Short-Term Debt [Line Items] Deferred income taxes Deferred Tax Assets, Net Gain (Loss) On Non-Derivatives and Derivatives Used In Net Investment Hedge Gain (Loss) On Non-Derivatives and Derivatives Used In Net Investment Hedge Adjustment in other comprehensive income reflecting gains (losses) on foreign currency transactions that are designated as, and are effective as, hedges of net investment in foreign entity, gross of tax effect. PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Earnings (loss) per common share - diluted Earnings Per Share, Diluted [Abstract] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Schedule of Unrecognized Tax Benefits Roll Forward Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Other long-term assets Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent Pension and postretirement benefits Net amount recognized Pension and postretirement benefits, net amount Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Net Investment Hedging [Member] Net Investment Hedging [Member] Domestic Plan [Member] Domestic Plan [Member] Derivative Contract [Domain] Derivative Contract [Domain] Derivative Contract [Domain] 2030 Defined Benefit Plan, Expected Future Benefit Payment, Year Five All Individuals All Individuals [Member] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Trade receivables - third party and affiliates, net Increase (Decrease) in Receivables Capital expenditures on property, plant and equipment Payments to Acquire Property, Plant, and Equipment Mitsui & Co. Ltd. Mitsui & Co. Ltd. [Member] Mitsui & Co. Ltd. Name Forgone Recovery, Individual Name 2029 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Four 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] Operating cash provided by (used in) discontinued operations Cash Provided by (Used in) Operating Activity, Discontinued Operation Disposal Group Classification [Axis] Disposal Group Classification [Axis] U.S. Superfund sites US Superfund sites US Superfund sites. Other Financing Arrangements [Abstract] Other Financing Arrangements [Abstract] Other Financing Arrangements [Abstract] Error Corrections and Prior Period Adjustments Restatement [Line Items] Error Corrections and Prior Period Adjustments Restatement [Line Items] Auditor Information [Abstract] Auditor Information Number of Aa-grade non-callable bonds Defined Benefit Plan Assumption Number of Aa-grade Non-Callable Bonds Number of Aa-grade non-callable bonds from which market data is used to develop a yield curve to use as a basis in the US for the rate used to discount pension and postretirement benefit plan liabilities. Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Geographical [Axis] Geographical [Axis] Derivative Liability [Abstract] Derivative Liability [Abstract] Senior unsecured notes due 2030, interest rate of 7.050%(1) USD Senior Unsecured Notes Due 2030 [Member] USD 1 Billion 6.550% Senior Unsecured Notes Due 2030 Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Tax credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards Foreign exchange gain (loss), net Gain (Loss), Foreign Currency Transaction, before Tax Liability percentage Environmental Liability Percentage Estimated ultimate allocable share of cleanup costs. Asia Pacific [Member] Asia Pacific [Member] Alternative Minimum Tax Credit Carryforwards, Before Tax Alternative Minimum Tax Credit Carryforwards, Before Tax Alternative Minimum Tax Credit Carryforwards, Before Tax Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security Global intangible low-taxed income Effective Income Tax Rate Reconciliation, GILTI, Percent Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Comprehensive Income (Loss) [Table] Comprehensive Income (Loss) [Table] Comprehensive Income (Loss) [Table] Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration] Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration] Other environmental remediation liabilities Other environmental remediation reserves Other environmental remediation reserves. Foreign tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount Earnings Per Share [Abstract] Earnings Per Share [Abstract] 2030 Lessee, Operating Lease, Liability, to be Paid, Year Five Restructuring Plan [Axis] Restructuring Plan [Axis] Noncontrolling interest, ownership percentage by parent Subsidiary, Ownership Percentage, Parent Schedule of Company Commitments to Fund Benefit Obligations Schedule of Company Commitments to Fund Benefit Obligations [Table Text Block] Schedule of Company Commitments to Fund Benefit Obligations [Table Text Block]. Tax Credit Carryforward, Amount Tax Credit Carryforward, Amount CNCC Working Capital Loan Agreement Due June 17, 2027 [Member] CNCC Working Capital Loan Agreement Due June 17, 2027 [Member] Celanese (Nanjing) Chemical Co., Ltd ("CNCC") senior unsecured working capital loan agreement with a borrowing capacity of CNY 200 million, maturing on June 17, 2027. Indemnification percentage exceeding ceiling amount Indemnification percentage exceeding ceiling amount The percentage of the amount above the ceiling that the Company will indemnify Hoechst for. 0.625% Senior Notes due 2028 Senior unsecured notes due 2028, interest rate of 0.625% EUR Senior Unsecured Notes Due 2028 [Member] EUR Senior Unsecured Notes Due 2028 Insurance contracts in nonqualified pension trusts, carrying amount Cash Surrender Value of Life Insurance Shares repurchased Treasury Stock, Shares, Acquired Later years Finance Lease, Liability, to be Paid, after Year Five JPY Denominated Borrowings JPY Denominated Borrowings [Member] The amount of the 2025 Offering converted to JPY denominated borrowings. Maturing on April 15, 2030. Award Timing Disclosures [Line Items] Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Service cost Defined Benefit Plan, Service Cost Benefit Obligations [Abstract] Benefit Obligations [Abstract] Benefit Obligations [Abstract] Measurement Frequency [Domain] Measurement Frequency [Domain] Exchange rate changes Restructuring Reserve, Foreign Currency Translation Gain (Loss) Lessee, Operating Lease, Renewal Term Lessee, Operating Lease, Renewal Term Stockholders' Equity Equity [Text Block] U.S. - State Deferred State and Local Income Tax Expense (Benefit) Schedule of Environmental Remediation Reserves Environmental Exit Costs by Cost [Table Text Block] Net earnings (loss) attributable to Celanese Corporation Net earnings (loss) attributable to Celanese Corporation Net Income (Loss) Net Income (Loss) Attributable to Parent Senior unsecured notes due 2034, interest rate of 7.375% USD Senior Unsecured Notes Due 2034 [Member] USD 800 Million 7.375% Senior Unsecured Notes Due 2034 Construction in progress Construction in Progress [Member] Schedule of Income Taxes [Table] Schedule of Income Taxes [Table] Schedule of Income Taxes [Table]. Schedule of Effective Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Adoption Date Trading Arrangement Adoption Date Base Rate Base Rate [Member] One-time Termination Benefits One-time Termination Benefits [Member] Contract with Customer, Asset, after Allowance for Credit Loss Contract with Customer, Asset, after Allowance for Credit Loss 5.337% Senior Notes due 2029 Senior unsecured notes due 2029, interest rate of 5.587%(1) EUR Senior Unsecured Notes Due 2029 [Member] EUR 500 Million 5.337% Senior Unsecured Notes Due 2029 [Member] Tax Credit Carryforward [Table] Tax Credit Carryforward [Table] Customer- Related Intangible Assets Customer Relationships [Member] Operating profit (loss) Operating profit (loss) Operating Income (Loss) Offsetting Liabilities Offsetting Liabilities [Table Text Block] CNCC Revolving Credit Agreement CNCC Revolving Credit Agreement [Member] Celanese (Nanjing) Chemical Co., Ltd ("CNCC") revolving credit agreement with a borrowing capacity of CNY 100 million expiring 12 months from drawdown date. Disposition (Note 4) Finite-Lived Intangible Assets, Transferred, Accumulated Amortization Amount of transfers (into) out of Accumulated Amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. Retained earnings Retained Earnings (Accumulated Deficit) Schedule of Treasury Stock Class of Treasury Stock [Table Text Block] Singapore Factoring Agreements Singapore Factoring Agreements [Member] Singapore Factoring Agreements CNCC 3-Year Working Capital Loan Agreement CNCC 3-Year Working Capital Loan Agreement [Member] Celanese (Nanjing) Chemical Co., Ltd ("CNCC") working capital loan agreement with a borrowing capacity of CNY 300 million expiring 3 years from drawdown date. 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] Impairment loss (Note 2) Impairment loss (Note 2) Impairment of Intangible Assets, Indefinite-Lived (Excluding Goodwill) Curtailments Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment Class of Stock [Axis] Class of Stock [Axis] Revision of Prior Period, Error Correction, Adjustment Revision of Prior Period, Error Correction, Adjustment [Member] Environmental Liabilities Environmental Costs, Policy [Policy Text Block] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Dividend income - equity investments Investment Income, Dividend Other Effective Income Tax Rate Reconciliation, Cross-Border, Other, Amount Celanese Corporation Celanese Corporation [Member] Celanese Corporation 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] Other Deferred Tax Liabilities, Other Liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities, Current Retirement Plan Type [Axis] Retirement Plan Type [Axis] Statement [Table] Statement [Table] Other income (expense), net Other Nonoperating Income (Expense) Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Total Deferred Income Tax Expense (Benefit) Adjustments to reconcile net earnings (loss) to net cash provided by (used in) operating activities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Total Nontaxable or nondeductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent Other foreign jurisdictions Foreign Tax Jurisdiction, Other [Member] Balance as of the beginning of the period (in shares) Balance as of the end of the period (in shares) Shares, Issued Variable Rate [Domain] Variable Rate [Domain] Finance Lease, Liability, Noncurrent Finance Lease, Liability, Noncurrent Description of the Company and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Other Current notes receivables Other Receivables, Gross, Current All Adjustments to Compensation All Adjustments to Compensation [Member] Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral, Total Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral Tax Credit Carryforward, Valuation Allowance Tax Credit Carryforward, Valuation Allowance Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Amendment Flag Amendment Flag Other Postretirement Benefits Plan [Member] Other Postretirement Benefits Plan [Member] Schedule of Fair Values of Pension Plan Assets Schedule of Allocation of Plan Assets [Table Text Block] China Revolving Credit Facilities China Credit Facilities [Member] Arrangement in which senior unsecured bank obligations proceeds can continuously be obtained following repayments, but the total amount borrowed cannot exceed a specified maximum amount. Termination Date Trading Arrangement Termination Date Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Weighted-average operating leases discount rate Operating Lease, Weighted Average Discount Rate, Percent Other Other Foreign Countries [Member] Other Foreign Countries [Member]. Total amount of interest expense and penalties recognized in the consolidated balance sheets Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Weighted average shares - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Gross Asset Value Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Total uncertain tax positions that if recognized would impact the effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Acquisitions, Dispositions and Plant Closures Acquisitions, Dispositions and Plant Closures [Text Block] Acquisitions, Dispositions and Plant Closures [Text Block]. Schedule of Earnings (Loss) Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Special termination benefit Defined Benefit Plan, Cost of Providing Special and Contractual Termination Benefits Debt Disclosure [Abstract] Debt Disclosure [Abstract] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Percentage of fair value of sales receivables Percentage Of Fair Value Of Sales Receivables Percentage of fair value of sales receivables. CNCC Working Capital Loan Agreement Due December 21, 2027 [Member] CNCC Working Capital Loan Agreement Due December 21, 2027 [Member] Celanese (Nanjing) Chemical Co., Ltd ("CNCC") senior unsecured working capital loan agreement with a borrowing capacity of CNY 500 million, maturing on December 21, 2027. Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Income taxes receivable Income Taxes Receivable, Current 4.777% Senior Notes due 2026 Senior unsecured notes due 2026, interest rate of 5.277%(1) EUR Senior Unsecured Notes Due 2026 [Member] EUR 1 Billion 4.777% Senior Unsecured Notes Due 2026 2031-2035 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Comprehensive Income (Loss) [Line Items] Comprehensive Income (Loss) [Line Items] [Line Items] for Comprehensive Income (Loss) [Table] Total Effect of cross-border tax laws Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Amount Gain (loss) on cash flow hedges, gross amount Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, before Tax Estimates and Assumptions Use of Estimates, Policy [Policy Text Block] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Operating cash flows from finance leases Finance Lease, Interest Payment on Liability Current Other liabilities Liability, Defined Benefit Plan, Current Exchange rate changes Finite-Lived Intangible Assets, Foreign Currency Translation Gain (Loss) Current Other liabilities Liability, Defined Benefit Pension Plan, Current Gross amount offset in the consolidated balance sheets Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Foreign currency translation gain (loss) Foreign currency translation, net amount Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Insider Trading Arrangements [Line Items] Foreign Currency Contracts, Liability, Fair Value Disclosure Foreign Currency Contracts, Liability, Fair Value Disclosure Purchases Related Party Transaction, Purchases from Related Party Equity Securities [Member] Equity Securities [Member] Liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Currency [Axis] Currency [Axis] Total net assets Defined benefit plan fair value of plan assets net of non-financial plan receivables and payables Defined benefit plan fair value of plan assets net of non-financial plan receivables and payables. 2030 Finance Lease, Liability, to be Paid, Year Five Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Loss contingency accrual, carrying value, payments Loss Contingency Accrual, Payments Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Debt Instrument, Repurchased Face Amount Debt Instrument, Repurchased Face Amount Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Trademarks and Trade Names [Member] Trademarks and Trade Names [Member] Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Consolidation Items [Axis] Consolidation Items [Axis] Variable Rate [Axis] Variable Rate [Axis] Actual return on plan assets Defined Benefit Plan Actual Return on Plan Assets, Percent The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable, measured as a percentage. Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Equity Method Investment, Investees Other Equity Method Investment, Investees [Member] Other Equity Method Investment, Investees Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Schedule of Income Taxes [Line Items] Schedule of Income Taxes [Line Items] Schedule of Income Taxes [Line Items] 2.125% Senior Notes due 2027 Senior unsecured notes due 2027, interest rate of 2.125% EUR Senior Unsecured Notes Due 2027 [Member] EUR Senior Unsecured Notes Due 2027 [Member] Non-NEOs Non-NEOs [Member] Corporate Debt [Member] Corporate Debt Securities [Member] Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position December 2025 Offering of Senior Unsecured Notes December 2025 Offering of Senior Unsecured Notes [Member] The December 2025 Offering of senior unsecured notes by Celanese completed on December 17, 2025. This offering consisted of: USD 600 Million 7.000% Senior Unsecured Notes Due 2031 and USD 800 Million 7.375% Senior Unsecured Notes Due 2034. Useful Life, Shorter of Lease Term or Asset Utility [Member]