Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Pretax net gains (losses) related to derivative instruments and hedging activities in accumulated other comprehensive loss AOCI Including Portion Attributable to Noncontrolling Interest, before Tax Shenyang Jinbei Lear Automotive Seating Co. Ltd. (China) Shenyang Jinbei Lear Automotive Seating Co Ltd [Member] Shenyang Jinbei Lear Automotive Seating Co Ltd Accrued liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Summary of Expected Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Accounting Policies Accounting Policies [Line Items] Accounting Policies Award Timing Predetermined Award Timing Predetermined [Flag] Entity File Number Entity File Number Additional Paid-in Capital Additional Paid-in Capital [Member] On or After June 15, 2027 On or After June Fifteen Two Thousand Twenty Seven [Member] On or After June Fifteen Two Thousand Twenty Seven [Member] Intangible assets gross carrying value Intangible Assets Fully Amortized Intangible Assets Fully Amortized Tabular List, Table Tabular List [Table Text Block] Target percentage of asset allocation Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Affiliate transaction Affiliate Transaction Affiliate Transaction 3.5% Senior Notes due 2030 (the "2030 Notes") 2030 Notes Senior Notes Due Two Thousand Thirty [Member] Senior Notes Due Two Thousand Thirty Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Summary of Transaction With Affiliates and Other Related Parties Schedule of Related Party Transactions [Table Text Block] Summary of Classification of Recoverable Customer Engineering, Development and Tooling Costs Related to Long-term Supply Agreements Schedule Of Preproduction Costs Related To Long Term Supply Arrangements [Table Text Block] Balance sheet classification of recoverable customer engineering, development and tooling balances. 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Finite-Lived Intangible Asset, Useful Life Less: Net income attributable to noncontrolling interests Net income attributable to affiliates Net Income (Loss) Attributable to Noncontrolling Interest Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Net Carrying Value Finite-Lived Intangible Assets, Net Gain (loss) on sale of manufacturing facility Sale and Leaseback Transaction, Gain (Loss), Net Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification 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Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Derivative [Table] Derivative [Table] On or after February 28, 2030 On or After February Twenty Eight Two Thousand Twenty [Member] On or After February Twenty Eight Two Thousand Twenty Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Deferred compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other Undistributed earnings of foreign subsidiaries Deferred Tax Liabilities, Undistributed Foreign Earnings Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding U.S. state and local Current State and Local Tax Expense (Benefit) Document Transition Report Document Transition Report Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Benefits paid - lump-sum payout Defined Benefit Plan, Benefit Obligation, Lump Sum Payment Defined Benefit Plan, Benefit Obligation, Lump Sum Payment Underlying Securities Award Underlying Securities Amount Withholding taxes Effective Income Tax Rate Reconciliation, Withholding Taxes, Amount Effective Income Tax Rate Reconciliation, Withholding Taxes, Amount Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Kyungshin-Lear Sales and Engineering LLC Kyungshin Lear Sales And Engineering Limited Liability Company [Member] Kyungshin-Lear Sales and Engineering LLC [Member] Income Taxes Income Tax Disclosure [Text Block] Term loan borrowings Proceeds from Lines of Credit Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Mercedes-Benz Mercedes-Benz [Member] Mercedes-Benz Short-term lease expense Short-Term Lease, Cost Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Equity Balance at beginning of year Balance at end of year Equity, Including Portion Attributable to Noncontrolling Interest Repurchases of shares of common stock, average price (in dollars per share) Average Price per Share (in dollars per share) Shares Acquired, Average Cost Per Share Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Additional paid-in capital Additional Paid in Capital Spain SPAIN Variable lease expense Variable Lease, Cost Net sales Revenues Revenue from Contract with Customer, Excluding Assessed Tax Alternative Investments Defined Benefit Plan, Alternative Investment [Member] Defined Benefit Plan, Plan Assets, Category Axis Vested or expected to vest at the ending period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Excise taxes on share repurchases value Excise Taxes On Share Repurchases Value Excise Taxes On Share Repurchases Value Total current assets Current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Common stock, aggregate authorized repurchase amount Share Repurchase Program, Authorized, Amount General Motors General Motors [Member] General Motors [Member] Percentage of employees that are members of trade union and employed under labor agreements Percentage Of Employees Employed Under Collective Bargaining Agreements The percentage of the Company's employees that are members of industrial trade unions and are employed under the terms of collective bargaining agreements. Other Finance Lease Liability And Working Capital Loan Finance Lease Liability And Working Capital Loan Fair Value Measurement Inputs and Valuation Techniques Fair Value Measurement Inputs and Valuation Techniques [Line Items] 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] Other current assets Marketable Securities, Current Share Repurchase Program [Domain] Share Repurchase Program [Domain] Summary of Reconciliation of Segment Earnings to Consolidated Income Before Provision for Income Taxes Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Current Liabilities: Liabilities, Current [Abstract] Tax credit carryforwards, research Deferred Tax Assets, Tax Credit Carryforwards, Research Lease obligations under operating leases: Liabilities, Lessee [Abstract] Liabilities, Lessee [Abstract] Level 1 Fair Value, Inputs, Level 1 [Member] Borrowings outstanding Long-Term Line of Credit Related Party Transaction [Table] Related Party Transaction [Table] Diluted net income per share attributable to Lear (in dollars per share) Earnings Per Share, Diluted Foreign tax credits - other Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount Prior to July 15, 2051 Prior to July Fifteen Two Thousand Fifty One [Member] Prior to July Fifteen Two Thousand Fifty One Accounts receivable Receivables due from affiliates (including notes and advances) Accounts Receivable, after Allowance for Credit Loss, Current Prior Year Shares Prior Year Shares [Member] Prior Year Shares Summary of Weighted Average Actuarial Assumptions Used Defined Benefit Plan, Assumptions [Table Text Block] Common stock held in treasury (in shares) Treasury Stock, Common, Shares Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] State Income Tax Paid, State and Local, after Refund Received Consolidation Items [Domain] Consolidation Items [Domain] Auditor Location Auditor Location Investments in Affiliates and Other Related Party Transactions Equity Method Investments and Joint Ventures Disclosure [Text Block] Unusual or Infrequent Item, or Both [Table] Unusual or Infrequent Item, or Both [Table] Gross profit Gross margin Gross Profit 51-6099782-001 Group One [Member] Group One [Member] Actuarial (gains) losses Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Comprehensive Income Comprehensive Income, Policy [Policy Text Block] U.S. Domestic Tax Jurisdiction [Member] Less: Imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Intangible assets classified as held for sale Disposal Group, Including Discontinued Operation, Intangible Assets Cash paid for income taxes, net of refunds received of $29.5 million in 2025, $24.1 million in 2024 and $15.7 million in 2023 Total Income Taxes Paid, Net Corporate bonds Corporate Bond Securities [Member] 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Two Long-Term Debt Long-Term Debt, Gross Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Compensation and employee benefits Employee-related Liabilities, Current Total undiscounted cash flows Lessee, Operating Lease, Liability, to be Paid Dividends declared to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Amounts recognized in OCIL during the period Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Intersegment Eliminations Intersegment Eliminations [Member] Expiration Date Trading Arrangement Expiration Date Period for amortizing actuarial losses Defined Benefit Plan Amortization of Actuarial Losses Amortization Period Defined Benefit Plan Amortization of Actuarial Losses Amortization Period Summary of Amounts Recorded in Accumulated Other Comprehensive Loss Not Yet Recognized in Net Periodic Benefit Cost (Credit) Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] Summary of Notional Amount and Estimated Fair Value of Foreign Currency Contracts and Related Classification Schedule of Foreign Exchange Contracts, Statement of Financial Position [Table Text Block] 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Five Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Fixed Income Fixed income funds Fixed Income Securities [Member] Summary of Beneficial Ownership, Summarized Financial Information, and Amounts Recorded in Consolidated Balance Sheet for Affiliates Equity Method Investments [Table Text Block] Property, plant and equipment, net Net property, plant and equipment Property, Plant and Equipment, Net RevoLaze, LLC Revolaze Limited Liability Company [Member] Revolaze Limited Liability Company [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Accounts receivable Increase (Decrease) in Accounts Receivable Inventories Inventory, Policy [Policy Text Block] Restructuring Cost [Table] Restructuring Cost [Table] Asia Asia [Member] Series A convertible preferred stock Series A Preferred Stock [Member] Entity Current Reporting Status Entity Current Reporting Status Derivative Derivative [Line Items] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Consolidated Entities [Domain] Consolidated Entities [Domain] Provision for income taxes at U.S. federal statutory income tax rate Consolidated income before provision for income taxes and equity in net income of affiliates multiplied by the United States federal statutory income tax rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Impact of foreign branches net of tax credits (as a percent) Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent Stellantis Stellantis [Member] Stellantis Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Executive Category: Executive Category [Axis] Redemption price, notice period Debt Instrument, Redemption Price, Notice Period Debt Instrument, Redemption Price, Notice Period SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] Domestic state and local income tax, net of federal income tax effect (as a percent) Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Comprehensive income (loss): Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Accumulated benefit obligation Defined Benefit Plan, Accumulated Benefit Obligation Reserves Inventory Valuation Reserves Current Fiscal Year End Date Current Fiscal Year End Date Initial healthcare cost trend rate Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year Changes in Working Capital Items: Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Cash flows from operating activities Proceeds from Insurance Settlement, Operating Activities Summary of Classification of Net Deferred Income Tax Asset Classification Of Net Deferred Taxes [Table Text Block] Tabular disclosure of the current or long-term nature of net deferred tax assets or liabilities recognized in the statement financial position. Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] India INDIA Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Reclassification adjustments Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Group of Equity Method Investments Group Of Equity Method Investments [Member] Group Of Equity Method Investments Summary of Fair Value Measurements and Related Valuation Techniques and Fair Value Hierarchy Level Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Marketable equity securities Equity Securities, FV-NI, Current Long-term asset basis differences Deferred Tax Assets (Liabilities), Long-Term Asset Basis Difference Deferred Tax Assets (Liabilities), Long-Term Asset Basis Difference Unrecognized tax benefits Balance at beginning of period Balance at end of period Unrecognized Tax Benefits Operating lease right-of-use assets Unrecorded Unconditional Purchase Obligation Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Poland POLAND Leases Lessee, Operating Leases [Text Block] Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Measure: Measure [Axis] Environmental Loss Contingency Statement Of Financial Position Extensible Enumeration Not Disclosed Flag Environmental Loss Contingency Statement Of Financial Position Extensible Enumeration Not Disclosed Flag Environmental Loss Contingency Statement Of Financial Position Extensible Enumeration Not Disclosed Flag Changes in other long-term liabilities Increase (Decrease) in Noncurrent Liabilities, Other Increase (Decrease) in Noncurrent Liabilities, Other Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Remaining repurchase authorization Share Repurchase Program, Remaining Authorized, Amount Cost of sales Cost of Product and Service Sold 2.6% Senior Notes due 2032 (the "2032 Notes") 2032 Notes Senior Notes Due Two Thousand Thirty Two [Member] Senior Notes Due Two Thousand Thirty Two Disposal Group Classification [Domain] Disposal Group Classification [Domain] Dividends received from affiliates Proceeds From Dividends Received From Affiliates Proceeds from the dividends received from affiliates. Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Foreign currency translation and other Goodwill, Foreign Currency Translation And Other Changes Goodwill, Foreign Currency Translation And Other Changes Entity Tax Identification Number Entity Tax Identification Number On or after February 15, 2029 On or After February Fifteen Two Thousand Twenty Nine [Member] On or After February Fifteen Two Thousand Twenty Nine Translation adjustment Other Comprehensive Income Defined Benefit Plan Foreign Currency Exchange Rate Changes The amount of increase or decrease in other defined benefit plan other comprehensive income attributed to foreign currency changes. Accounting Policies [Table] Accounting Policies [Table] Accounting Policies Outstanding at the beginning period (in shares) Outstanding at the ending period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Common stock, shares issued (in shares) Common Stock, Shares, Issued Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Credit Agreement — Revolving Credit Facility Credit Agreement - Revolving Credit Facility [Member] Credit Agreement - Revolving Credit Facility [Member] Income Taxes [Table] Income Taxes [Table] Income Taxes [Table] Entity Public Float Entity Public Float Summary of Changes in Carrying Amount of Goodwill Schedule of Goodwill [Table Text Block] Interest expense, net Interest expense, net Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Other current assets Derivative Asset, Current Total Shareholder Return Amount Total Shareholder Return Amount Loss Contingencies Loss Contingencies [Line Items] Net unrecognized actuarial gains (losses) Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Total Restructuring and asset impairment charge Restructuring Costs and Asset Impairment Charges Corporate, Non-Segment Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Foreign Income Tax Paid, Foreign, after Refund Received Total long-term liabilities Non-current liabilities Liabilities, Noncurrent Nondeductible compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Capital expenditures recorded in accounts payable Capital Expenditures Incurred but Not yet Paid Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Right-of-use assets Right Of Use Assets [Member] Right Of Use Assets Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Morocco MOROCCO Asset Class [Domain] Asset Class [Domain] Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Settlement charges Defined Benefit Plan, Settlement Charges Defined Benefit Plan, Settlement Charges Other long-term liabilities Liability, Defined Benefit Plan, Noncurrent Statement Statement [Line Items] Summary of Restructuring Activity Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Balance sheet — cash and cash equivalents Cash and Cash Equivalent Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Common Stock Common Stock [Member] Distributed (vested) (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Net Change in Cash, Cash Equivalents and Restricted Cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Dilutive effect of common stock equivalents (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Mexico Mexico MEXICO Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Statistical Measurement [Domain] Statistical Measurement [Domain] Percentage of total goodwill (less than) (percent) Percentage Of Company's Goodwill Percentage Of Company's Goodwill Retirement benefit plans Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits Current Other Current Assets [Member] Thereafter 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] Transportation costs Variable Lease Cost, Transportation Variable Lease Cost, Transportation Right-of-use assets Right-of-Use Assets Impairment Right-of-Use Assets Impairment Restricted cash included in other current assets Restricted Cash, Current Foreign Foreign plans Foreign Plan [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Asset Class [Axis] Asset Class [Axis] Interest Rate Swap Interest Rate Swap [Member] Long-term Other Noncurrent Assets [Member] Assets Held for Sale and Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Equity in net income of affiliates Equity in net income of affiliates Income (Loss) from Equity Method Investments Leases [Abstract] Leases [Abstract] Summary of Dividends Declared and Paid Dividends Declared [Table Text Block] Accounts payable (including $15.4 million of cash paid in 2023 in conjunction with the acquisition of IGB to settle pre-existing accounts payable) Accounts payable Increase (Decrease) in Accounts Payable Summary of Assets Held for Sale Disposal Groups, Including Discontinued Operations [Table Text Block] Type of Restructuring [Domain] Type of Restructuring [Domain] Retirement Plan Name [Axis] Retirement Plan Name [Axis] Derivative contracts transfers in to Level 3 fair value hierarchy Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 Contributions to Multi-Employer Pension Plans Multiemployer Plan, Employer Contribution, Cost Unionized Employees Unionized Employees Concentration Risk [Member] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Basic net income per share attributable to Lear (in dollars per share) Earnings Per Share, Basic Net investment hedges Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax Expense, net (including changes in estimates) Standard Product Warranty Accrual, Warranties Issued and Preexisting, Increase (Decrease) Represents the aggregate increase in the liability for accruals related to standard product warranties issued during the reporting period and the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard product warranties (including adjustments related to changes in estimates). Does not include any increase or decrease in the liability for accruals related to extended product warranties. Summary of Assumed Health Care Cost Trend Rates Schedule of Health Care Cost Trend Rates [Table Text Block] Common stock reserved for issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Ford Ford Motor Company [Member] Ford Motor Company [Member] Fair value of plan assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets Global changes in unrecognized tax benefits (as a percent) Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Net deferred income tax asset before valuation allowance Deferred Tax Assets, Gross Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Total other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Summary of Segment Financial Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Short-term borrowings Short-Term Debt Multi-employer Plan Total Contributions Multiemployer Plans, Plan Contributions [Member] Multiemployer Plans, Plan Contributions [Member] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Affiliated Entity Affiliated Entity [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Proceeds from sale of productive assets Proceeds from Sale of Productive Assets Other E&D Costs Research and Development Expense, Policy [Policy Text Block] Compensation expense Share-Based Payment Arrangement, Expense Hedging Designation [Domain] Hedging Designation [Domain] Current Assets: Assets, Current [Abstract] Total liabilities and equity Liabilities and Equity Consolidated statements of income Unusual or Infrequent Item, or Both, Insurance Proceeds Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Jiangxi Jiangling Lear Interior Systems Co., Ltd. (China) Jiangxi Jiangling Lear Interior Systems Co Ltd [Member] Jiangxi Jiangling Lear Interior Systems Co, Ltd [Member] Defined Benefit Plans Defined benefit plans: Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Stock Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Other Deferred Tax Assets, Other Common stock Defined Benefit Plan, Equity Securities, Common Stock [Member] Pretax loss related to intercompany transactions for which settlement is not planned or anticipated in the foreseeable future Adjustment for Long-Term Intra-Entity Transaction, before Tax Equity Method Investment [Table] Equity Method Investment [Table] Capital expenditures Segment, Expenditure, Addition to Long-Lived Assets Accounting Policies [Abstract] Accounting Policies [Abstract] Summary of Maturity of Lease Obligations Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Common Stock Held in Treasury Treasury Stock, Common [Member] Pay vs Performance Disclosure [Line Items] Lease obligations under operating leases Lease obligations under operating leases Operating Lease, Liability Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration] Unrecognized net operating loss carryforwards, foreign Unrecognized Tax Benefits Operating Loss Carryforwards Foreign The Component of income tax benefit representing unrecognized net operating loss carryforwards, foreign. Other Other Liabilities, Noncurrent Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Accrued liabilities and other Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Employer contributions Defined Benefit Plan, Plan Assets, Contributions by Employer 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Period [Domain] Period [Domain] Period [Domain] Comprehensive income attributable to Lear Comprehensive Income (Loss), Net of Tax, Attributable to Parent Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Expected return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Long-Term Debt, Net Long-Term Debt Total assets Total assets Assets 2026 Finite-Lived Intangible Asset, Expected Amortization, Year One Geographical [Domain] Geographical [Domain] Cash collected related to E&D and tooling costs Recoveries Of Preproduction Costs Related To Long Term Supply Agreements Cash recoveries of preproduction engineering, design and tooling costs incurred on behalf of a customer. Income Taxes Income Tax, Policy [Policy Text Block] Cash Flows from Operating Activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Research and development tax credits (as a percent) Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Gains (losses) recognized in accumulated other comprehensive loss Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax Contract termination costs Business Exit Costs Technology Patented Technology [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Four Cash dividends declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Impairment charges Impairment, Long-Lived Asset, Held-for-Use Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Right-of-use assets obtained in exchange for operating lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Derivatives net investment hedge foreign currency translation Derivatives used in Net Investment Hedge, Net of Tax Level 2 Fair Value, Inputs, Level 2 [Member] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Domestic state and local income tax, net of federal income tax effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Aggregate investment in affiliates 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 Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Revenue Concentration Risk Revenue from Rights Concentration Risk [Member] Change in plan assets: Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Hyundai Transys Lear Automotive India Private Limited (India) Hyundai Transys Lear Automotive India Private Limited [Member] Hyundai Transys Lear Automotive Private Limited [Member] Summary of Consolidated Income Before Provision for Income Taxes and Equity in Net Income of Affiliates and Components of Provision for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Property, Plant and Equipment Property, Plant and Equipment, Policy [Policy Text Block] PEO PEO [Member] Global intangible low-taxed income Effective Income Tax Rate Reconciliation, GILTI, Amount Consolidated income before provision for income taxes and equity in net income of affiliates Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest United States U.S. Domestic plans UNITED STATES Summary of Changes in Reserves for Product Liability and Warranty Claims Schedule of Product Warranty Liability [Table Text Block] Changes in valuation allowances Valuation allowance adjustments Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Retained Earnings Retained Earnings [Member] Income Tax Authority [Axis] Income Tax Jurisdiction [Axis] On or after July 15, 2051 On or After July Fifteen Two Thousand Fifty One [Member] On or After July Fifteen Two Thousand Fifty One Summary of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Cash, Cash Equivalents and Restricted Cash as of Beginning of Period Cash, Cash Equivalents and Restricted Cash as of End of Period Statement of cash flows — cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Revenue, Major Customer Revenue, Major Customer [Line Items] Interest expense, net Interest Expense [Member] Income and other taxes payable Taxes Payable, Current Other long-term liabilities Derivative Liability, Noncurrent Beginning balance Ending balance Standard Product Warranty Accrual Lear Corporation Shareholders' Equity Parent [Member] Consolidated net income Consolidated net income Consolidated net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Total notional amount Derivative, Notional Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Operating cash flows: Cash Flow, Operating Activities, Lessee [Abstract] Right-of-use assets under operating leases: Assets, Lessee [Abstract] Assets, Lessee [Abstract] City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Non-cash activity: Lessee Disclosure [Abstract] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Proceeds from line of credit Proceeds from Long-Term Lines of Credit Cash Flows from Investing Activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Tangible long-lived assets Long-Lived Assets Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Shenzhen Shinry Lear Electric Control Technology Co., Ltd. (China) Shenzhen Shinry Lear Electric Control Technology Co., Ltd. [Member] Shenzhen Shinry Lear Electric Control Technology Co., Ltd. SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Current income tax expense: Federal Income Tax Expense (Benefit), Continuing Operations [Abstract] Amortization of actuarial gains Defined Benefit Plan, Amortization of Gain (Loss) Effective Income Tax Rate Reconciliation [Line Items] Effective Income Tax Rate Reconciliation [Line Items] Total lease expense Lease, Cost Selling, general and administrative expenses Selling, General and Administrative Expenses [Member] Cash Flow Hedging Cash Flow Hedging [Member] Debt, weighted average interest rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate Cost of sales Cost of sales Cost of Sales [Member] Goodwill Beginning balance Ending balance Goodwill Summary of Cash Flow Information, Lease Expense, Weighted Average Lease Term and Discount Rate Lease, Cost [Table Text Block] Asset impairment related to restructuring Asset impairments Tangible Asset Impairment Charges U.S. federal Deferred Federal Income Tax Expense (Benefit) Gross Unrecognized Tax Benefits Unrecognized Tax Benefits [Roll Forward] Auditor Name Auditor Name Operating Lease, Lease Not yet Commenced Operating Lease, Lease Not yet Commenced [Member] Number of multi-employer pension plans Multiemployer Plans, Number of Plans Multiemployer Plans, Number of Plans Supplementary Disclosure: Supplemental Cash Flow Information [Abstract] Derivative contracts classified within Level 3 of fair value hierarchy Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Restructuring Cost and Reserve Restructuring Cost and Reserve [Line Items] Other Performance Measure, Amount Other Performance Measure, Amount Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Government obligations US Treasury and Government [Member] Summary of Restricted Cash Restrictions on Cash and Cash Equivalents [Table Text Block] Percentage of net sales Revenue Related To Prior Periods, Percentage Of Net Sales Revenue Related To Prior Periods, Percentage Of Net Sales Marketable Equity Securities Marketable Securities, Policy [Policy Text Block] Capitalized pre-production E&D costs Preproduction Engineering And Development Costs Related To Long Term Supply Arrangements Costs Capitalized Amount of recoverable preproduction engineering and design costs related to long term supply agreements capitalized during the reporting period. 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(China) Guangzhou Lear Automotive Components Co Ltd [Member] Guangzhou Lear Automotive Components Co Ltd [Member] 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 Selling, General and Administrative Expense Prior to November 15, 2048 Prior to November Fifteen Two Thousand Forty Eight [Member] Prior to November Fifteen Two Thousand Forty Eight Summary of Changes in Accumulated Other Comprehensive Loss, Net of Tax Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Depreciation and amortization Depreciation, Depletion and Amortization Movement in Standard Product Warranty Accrual Movement in Standard Product Warranty Accrual [Roll Forward] Settlement (gains) losses 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] Credit Agreement Revolving Credit Facility [Member] Statutory tax rate difference Differences in income taxes on foreign earnings, losses and remittances Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Arrangement Duration Trading Arrangement Duration Changchun Lear FAWSN Automotive Seat Systems Co., Ltd. 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(China) Beijing Lear Hyundai Transys Co., Ltd. [Member] Beijing Lear Hyundai Transys Co., Ltd. Translation adjustment Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) Other Changes SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment Deferred tax assets, right of use asset Deferred Tax Assets, Right of Use Asset Deferred Tax Assets, Right of Use Asset Other long-term assets Equity Securities without Readily Determinable Fair Value, Amount AccuMED Holdings Corp AccuMED Holdings Corp [Member] AccuMED Holdings Corp Member Machinery and equipment Machinery and Equipment [Member] Weighted average grant date fair value of performance shares granted (in dollars per share) Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Interest cost Interest cost Defined Benefit Plan, Interest Cost Return Seeking Assets Defined Benefit Plan, Return Seeking Assets [Member] Defined Benefit 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Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. Common stock, $0.01 par value, 300,000,000 shares authorized; 64,571,405 shares issued as of December 31, 2025 and 2024 Common Stock, Value, Issued Alternative investments Fair Value Measured at Net Asset Value Per Share [Member] Business Combination [Axis] Business Combination [Axis] Consolidated comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Honduras Electrical Distribution Systems S. de R.L. de C.V. 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