Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Title of 12(b) Security Title of 12(b) Security Aggregate carrying value Reported Value Measurement [Member] Document Fiscal Year Focus Document Fiscal Year Focus Transportation costs Variable Lease Cost, Transportation Variable Lease Cost, Transportation Other related costs Other Restructuring Costs Right-of-use assets Right-of-Use Assets Impairment Right-of-Use Assets Impairment Total fair value Asset (Liability) Derivative Assets (Liabilities), at Fair Value, Net Weighted Average Interest Rate Debt, Weighted Average Interest Rate Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Segment Reporting [Abstract] Segment Reporting [Abstract] South America South America [Member] Common stock, $0.01 par value, 300,000,000 shares authorized; 64,571,405 shares issued as of July 4, 2026 and December 31, 2025 Common Stock, Value, Issued 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Schedule of Long-Term Debt and Related Weighted Average Interest Rates Schedule of Long-Term Debt Instruments [Table Text Block] Pension and Other Postretirement Benefit Plans Retirement Benefits [Text Block] 3.5% Senior Notes due 2030 (the "2030 Notes") Senior Notes Due Two Thousand Thirty [Member] Senior Notes Due Two Thousand Thirty [Member] Line of Credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date Valuation allowances on deferred tax assets Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Derivative Instrument [Axis] Derivative Instrument [Axis] Schedule 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. Other comprehensive income (loss) recognized during the period, tax expense (benefit) Other Comprehensive Income (Loss) before Reclassifications, Tax Schedule of Tax Benefits (Expense) Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Accounts receivable, reserves Accounts Receivable, Allowance for Credit Loss Amendment Flag Amendment Flag Goodwill Goodwill [Line Items] Total Restructuring costs and asset impairment charges Restructuring Costs and Asset Impairment Charges CURRENT LIABILITIES: Liabilities, Current [Abstract] Debt and Equity Securities, FV-NI Debt and Equity Securities, FV-NI [Line Items] Average price per share (in dollars per share) Shares Acquired, Average Cost Per Share Average Price per Share (in dollars per share) Treasury Stock, Acquired Average Cost Per Share, Excluding Excise Tax and Commissions Treasury Stock, Acquired Average Cost Per Share, Excluding Excise Tax and Commissions Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Disposal Group Classification [Axis] Disposal Group Classification [Axis] Restructuring charges and various other items Income Tax Expense (Benefit), Discrete Items, Restructuring And Other Income Tax Expense (Benefit), Discrete Items, Restructuring And Other Disposal Group, Held-for-Sale, Not Discontinued Operations Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] Leases [Abstract] Leases [Abstract] Term Loan Delayed-Draw Term Loan Facility (the "Term Loan") Delayed Draw Term Loan Facility [Member] Delayed Draw Term Loan Facility Total long-term liabilities Liabilities, Noncurrent Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Schedule of Reconciliation of Cash, Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Foreign currency translation and other Standard Product Warranty Accrual, Foreign Currency Translation Gain (Loss) Property, Plant, and Equipment [Abstract] Property, Plant, and Equipment [Abstract] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Capital expenditures Segment Reporting, Long-Lived Asset, Expenditure for Addition LONG-TERM LIABILITIES: Liabilities, Noncurrent [Abstract] Notional amount Derivative, Notional Amount Share Repurchase Program [Domain] Share Repurchase Program [Domain] Average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Retirement Benefits [Abstract] Retirement Benefits [Abstract] Reserves Inventory Valuation Reserves Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Number of reportable operating segments Number of Reportable Segments Total current liabilities Liabilities, Current 2030 Lessee, Operating Lease, Liability, to be Paid, Year Four Other current liabilities Derivative Liability, Current Total Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months Entity Address, City or Town Entity Address, City or Town Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Foreign Foreign Plan [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Class of Stock [Axis] Class of Stock [Axis] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Interest rate (as a percent) Line of Credit Facility, Interest Rate at Period End Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement 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Property, plant and equipment Plant and equipment impairment charges Impairment of Long-Lived Assets to be Disposed of Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Net change in recoverable customer engineering, development and tooling Increase (Decrease) In Recoverable Customer Engineering Development And Tooling Increase (Decrease) In Recoverable Customer Engineering Development And Tooling Long-Term Debt, Net Long-Term Debt Percentage of net sales to prior years revenue (as a percent) Percentage Of Net Sales To Prior Years Revenue Percentage Of Net Sales To Prior Years Revenue Long-Lived Assets Property, Plant, and Equipment [Text Block] Schedule of Maturity of Lease Obligations Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Document Period End Date Document Period End Date Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Comprehensive Income and Equity Equity [Text Block] Security Exchange Name Security Exchange Name Common stock held in treasury, 15,037,974 and 13,924,658 shares as of July 4, 2026 and December 31, 2025, respectively, at cost Treasury Stock, Common, Value Non-cash activity: Lessee Disclosure [Abstract] 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. Fiscal Period Reporting Fiscal Period, Policy [Policy Text Block] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Accrued liabilities Operating Lease, Liability, Current Share-based compensation Income Tax Expense (Benefit), Discrete Items, Share-based Compensation Income Tax Expense (Benefit), Discrete Items, Share-based Compensation Schedule of Changes in Reserves for Product Liability and Warranty Claims Schedule of Product Warranty Liability [Table Text Block] Segment Reporting Segment Reporting, Policy [Policy Text Block] Aggregate Repurchases Treasury Stock, Value, Acquired, Cost Method, Excluding Excise Tax Treasury Stock, Value, Acquired, Cost Method, Excluding Excise Tax Schedule of Property, Plant and Equipment Property, Plant, and Equipment [Table Text Block] Income tax benefits (expense) related to significant discrete items Income Tax Expense (Benefit), Discrete Items Income Tax Expense (Benefit), Discrete Items Net Income Per Share Attributable to Lear Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Settlements Standard Product Warranty Accrual, Decrease for Payments Earnings Per Share [Abstract] Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Trading Symbol Trading Symbol Foreign currency translation adjustments related to intercompany transactions losses Adjustment for Long-Term Intra-Entity Transaction, before Tax Geographical [Domain] Geographical [Domain] Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Pre Production Costs Related to Long Term Supply Arrangements [Table] Pre Production Costs Related To Long Term Supply Arrangements [Table] Pre Production Costs Related to Long Term Supply Arrangements [Table] Company Selected Measure Name Company Selected Measure Name Europe and Africa Europe and Africa [Member] Europe and Africa [Member] Dividends paid to noncontrolling interests Payments of Ordinary Dividends, Noncontrolling Interest Schedule of Reconciliation of Restricted Cash Restrictions on Cash and Cash Equivalents [Table Text Block] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Defined benefit plans: Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Long-term debt Long-Term Debt Long-Term Debt, Gross Line of credit facility, facility fee (as a percent) Line of Credit Facility, Commitment Fee Percentage Asset Class [Domain] Asset Class [Domain] Credit Facility [Domain] Credit Facility [Domain] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Average diluted shares outstanding (in shares) Average diluted shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue Disaggregation of Revenue [Line Items] Cross currency interest rate Cross Currency Interest Rate Contract [Member] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] 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] 3.55% Senior Notes due 2052 (the "2052 Notes") Senior Notes Due Two Thousand Fifty Two [Member] Senior Notes Due Two Thousand Fifty Two Derivative Instruments and Hedging Activities Derivatives, Policy [Policy Text Block] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Provision for employee termination benefits Restructuring Reserve, Accrual Adjustment Operating Lease, Lease Not yet Commenced Operating Lease, Lease Not yet Commenced [Member] Less: Imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Short-term borrowings Short-Term Debt Gross margin Gross Profit Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Dilutive effect of common stock equivalents (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Pre Production Costs Related to Long Term Supply Arrangements Pre Production Costs Related To Long Term Supply Arrangements [Line Items] Pre Production Costs Related to Long Term Supply Arrangements [Line Items] Cash paid related to operating lease obligations Operating Lease, Payments Award Timing Predetermined Award Timing Predetermined [Flag] Restricted cash included in other current assets Restricted Cash, Current Right-of-use assets under operating leases: Assets, Lessee [Abstract] Assets, Lessee [Abstract] Common Stock Held in Treasury Treasury Stock, Common [Member] Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Provision for employee termination benefits Severance Costs Comprehensive income: Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Debt and lease obligation Debt and Lease Obligation Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Level 1 Fair Value, Inputs, Level 1 [Member] Other long-term assets Derivative Asset, Noncurrent Effective tax rate (as a percent) Effective Income Tax Rate Reconciliation, Percent Total undiscounted cash flows Lessee, Operating Lease, Liability, to be Paid Fair Value Measurements Fair Value of Financial Instruments, Policy [Policy Text Block] Changes in Working Capital Items: Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract] All Executive Categories All Executive Categories [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Repayments of amounts outstanding Repayments of Long-Term Lines of Credit Debt instruments Long-Term Debt, Fair Value Schedule of Net Periodic Pension and Other Postretirement Benefit (Credit) Cost Schedule of Net Benefit Costs [Table Text Block] Depreciation expense Depreciation Depreciation Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Asset impairment charges Tangible Asset Impairment Charges Other long-term assets Operating Lease, Right-of-Use Asset Accumulated Other Comprehensive Income (Loss) AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Interest rate swap contracts Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Schedule of Information Used to Compute Basic and Diluted Net Income Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Restructuring Costs Associated with Exit or Disposal Activities or Restructurings, Policy [Policy Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Current portion of long-term debt Less — Current portion Long-Term Debt and Lease Obligation, Current Segment Reporting Segment Reporting [Text Block] Borrowings outstanding under revolving credit facility Long-Term Line of Credit Minimum Minimum [Member] Dividends paid to Lear Corporation shareholders Dividends paid Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Hedging Relationship [Axis] Hedging Relationship [Axis] Balance at January 1, 2026 Balance at July 4, 2026 Standard Product Warranty Accrual Schedule of Revenue by Reportable Segment and Geography Disaggregation of Revenue [Table Text Block] Effect of foreign currency translation Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Location, Statement of Income, Balance [Axis] Location, Statement of Income, Balance [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Equity Balance at beginning of period Balance at end of period Equity, Including Portion Attributable to Noncontrolling Interest 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] 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. Buildings and improvements Building and Building Improvements [Member] Average price per share (in dollars per share) Treasury Stock, Acquired Average Cost Per Share, Including Excise Tax Treasury Stock, Acquired Average Cost Per Share, Including Excise Tax Net periodic benefit (credit) cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Other Income and Expenses [Abstract] Other Income and Expenses [Abstract] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Term Benchmark, Central Bank Rate and RFR Loans Eurodollar [Member] Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) [Line Items] Unamortized Original Issue Premium (Discount) Debt Instrument, Unamortized Discount (Premium), Net Schedule of Estimated Aggregate Fair Value and Carrying Value of Debt Instruments Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Exercise Price Award Exercise Price Restructuring Cost [Table] Restructuring Cost [Table] Segment Reporting Segment Reporting [Line Items] Aggregate purchases authorized under common stock share repurchase program Share Repurchase Program, Authorized, Amount Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Interest Rate Swap Interest Rate Swap [Member] Property, Plant and Equipment Property, Plant, and Equipment [Policy Text Block] Repurchase Program Repurchase Program [Member] Repurchase Program Consolidated income before provision for income taxes and equity in net income of affiliates Pretax income before equity in net income of affiliates Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Debt Debt Disclosure [Text Block] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Schedule of Marketable Equity Securities Marketable Securities [Table Text Block] Unamortized Debt Issuance Costs Debt Issuance Costs, Net Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Accrual as of beginning of period Accrual as of end of period Restructuring Reserve Other expense, net Other expense, net Other Income (Expense), Net The sum of all other income and expenses (both operating and nonoperating) recognized by the entity in the period not otherwise specified in the income statement. Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Foreign currency contracts Foreign currency contracts, net Foreign Exchange Contract [Member] Recoverable customer E&D and tooling Preproduction Costs Related to Long-Term Supply Arrangements, Costs Capitalized Adoption Date Trading Arrangement Adoption Date Stated interest rate (as a percent) Debt Instrument, Interest Rate, Stated Percentage Dividends declared to Lear Corporation shareholders Dividends declared Dividends, Common Stock, Cash Lear Corporation shareholders' equity Equity, Attributable to Parent Settlement gain Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Marketable equity securities Equity Securities, FV-NI, Current ASSETS Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Lease obligations under operating leases Lease obligations under operating leases Operating Lease, Liability Insider Trading Policies and Procedures [Line Items] Other, net Proceeds from (Payment for) Other Financing Activity Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Selling, general and administrative expenses Selling, general and administrative Selling, General and Administrative Expense Contribution from noncontrolling interest holder Noncontrolling Interest, Increase from Subsidiary Equity Issuance Legal and Other Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Reserves for pending legal disputes, including commercial disputes and other matters Estimated Litigation Liability Tax reserves and audit settlements Effective Income Tax Rate Reconciliation, Tax Reserves And Audit Settlements, Amount Effective Income Tax Rate Reconciliation, Tax Reserves And Audit Settlements, Amount Schedule of Changes in Carrying Amount of Goodwill Goodwill [Table Text Block] Entity Central Index Key Entity Central Index Key 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. Less – accumulated depreciation Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] All Adjustments to Compensation All Adjustments to Compensation [Member] Other, net Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Equity [Abstract] Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Other comprehensive income (loss) recognized during the period Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Income Statement [Abstract] Income Statement [Abstract] Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Schedule of Provision for Income Taxes and Corresponding Effective Tax Rate Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Intersegment revenues Intersegment Eliminations [Member] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Schedule of Right-of-Use Assets and Lease Obligations Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] City Area Code City Area Code Variable Rate [Domain] Variable Rate [Domain] Accumulated Other Comprehensive Loss, Net of Tax Accumulated Other Comprehensive Loss, Net of Tax AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Name Forgone Recovery, Individual Name Finished goods Inventory, Finished Goods, Net of Reserves Balance sheet: Balance Sheet Related Disclosures [Abstract] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Other long-term assets Marketable Securities, Noncurrent Operating lease, lease not yet commenced, term of contract Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract Statement Statement [Line Items] Total long-term assets Assets, Noncurrent Total assets Total assets Assets Environmental reserves Accrual for Environmental Loss Contingencies Intersegment support activities Intersegment Support Activities Intersegment Support Activities Accounts Receivable Accounts Receivable [Policy Text Block] Amortization of prior service credit Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Operating segments Operating Segments [Member] Interest expense, net Interest expense, net Interest Expense, Nonoperating Investments in equity securities without readily determinable fair values Equity Securities without Readily Determinable Fair Value, Amount PEO PEO [Member] Other current assets Marketable Securities, Current Measurement Basis [Axis] Measurement Basis [Axis] Other Other Liabilities, Noncurrent Goodwill Balance at January 1, 2026 Balance at July 4, 2026 Goodwill Retirement Plan Type [Axis] Retirement Plan Type [Axis] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Fair Value Measurement Inputs and Valuation Techniques Fair Value Measurement Inputs and Valuation Techniques [Line Items] Significant contract liabilities recognized in revenue Contract with Customer, Liability, Revenue Recognized Other long-term liabilities Operating Lease, Liability, Noncurrent Retained Earnings Retained Earnings [Member] Credit Agreement Revolving Credit Facility [Member] Impairment of right of use assets Right-of-use assets Operating Lease, Impairment Loss Series A Convertible Preferred Stock Series A Preferred Stock [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Award Timing Disclosures [Line Items] Foreign currency translation: Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Diluted net income per share attributable to Lear (in dollars per share) Earnings Per Share, Diluted Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status E-Systems E-Systems E-Systems E-Systems Segment [Member] E-Systems Segment [Member] Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Net change in working capital items (see below) Net change in working capital items Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital Cash Flow Hedge Cash Flow Hedging [Member] Amortization of intangible assets Amortization of intangibles Intangible Asset, Finite-Lived, Amortization Expense Total comprehensive income Comprehensive Income (Loss), Net Of Tax, Including Portion Attributable To Nonredeemable Noncontrolling Interest Comprehensive Income (Loss), Net Of Tax, Including Portion Attributable To Nonredeemable Noncontrolling Interest Revolving credit facility borrowings Proceeds from Long-Term Lines of Credit Adjustments to reconcile consolidated net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Other Corporate And Eliminations [Member] Corporate And Eliminations [Member] Foreign currency contracts Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months Reclassification adjustments, tax (benefit) expense Reclassification from AOCI, Current Period, Tax Variable Rate Component [Domain] Variable Rate Component [Domain] Variable Rate Component [Domain] Net sales Revenue Revenue from Contract with Customer, Excluding Assessed Tax Property, plant and equipment, net Property, plant and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Interest cost Defined Benefit Plan, Interest Cost Financial Instruments [Domain] Financial Instruments [Domain] Schedule of Restructuring Activity Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Other income Other Income Inventories Inventory Disclosure [Text Block] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Goodwill Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount Less: Comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Estimated aggregate fair value Estimate of Fair Value Measurement [Member] Revenue Recognition Revenue from Contract with Customer [Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Schedule of Pretax Amounts Recognized in and Reclassified from Accumulated Other Comprehensive Loss and Net Gains (Losses) Expected to be Reclassified into Earnings Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Financial Instruments Financial Instruments Disclosure [Text Block] Construction in progress Construction in Progress [Member] Inventories Increase (Decrease) in Inventories Other, net Payment for (Proceeds from) Other Investing Activity Pretax gains (losses) related to derivative instruments and hedging activities in accumulated other comprehensive loss AOCI Including Portion Attributable to Noncontrolling Interest, before Tax Variable Rate Component One Variable Rate Component One [Member] Variable Rate Component One Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Pre-Production Costs Related to Long-Term Supply Agreements Preproduction Cost Related To Long Term Supply Agreements [Text Block] Entire disclosure for preproduction costs incurred related to long-term supply agreements. Segment Reporting [Table] Segment Reporting [Table] Cash Flows from Investing Activities: Cash Provided by (Used in) Investing Activity, Continuing Operation [Abstract] Schedule of Cash Flow Information, Lease Expense, Weighted Average Lease Term and Discount Rate Lease, Cost [Table Text Block] Marketable Equity Securities Marketable Securities, Policy [Policy Text Block] Other Other Assets, Current Unusual or Infrequent Item, or Both [Table] Unusual or Infrequent Item, or Both [Table] Cash Flows from Operating Activities: Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Segment earnings Operating Income (Loss) Schedule of Dividends Declared and Paid Dividends Declared [Table Text Block] Current Fiscal Year End Date Current Fiscal Year End Date 4.25% Senior Notes due 2029 (the "2029 Notes") Senior Notes Due Two Thousand Twenty Nine [Member] Senior Notes Due Two Thousand Twenty Nine [Member] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Financial Instruments Derivative [Line Items] Asia Asia [Member] Expected restructuring costs Restructuring and Related Cost, Expected Cost Schedule of Credit Agreement Interest Rate Ranges Schedule Of Long-Term Debt Instruments, Interest Rates [Table Text Block] Schedule Of Long-Term Debt Instruments, Interest Rates [Table Text Block] Net issuance of shares held in treasury in settlement of stock-based compensation Stock Issued During Period From Treasury Stock Value Share Based Compensation Value of stock issued during the period from treasury stock as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. 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. Operating lease right-of-use assets Unrecorded Unconditional Purchase Obligation Restructuring Reserve Restructuring Reserve [Roll Forward] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Cumulative impairment Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount Cash dividends declared per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Service cost Defined Benefit Plan, Service Cost Marketable Equity Securities Equity Securities [Member] Dividends declared to noncontrolling interest holders Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (Gains) losses reclassified from accumulated other comprehensive loss Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Operating cash flows: Cash Flow, Operating Activities, Lessee [Abstract] Common stock held in treasury (in shares) Treasury Stock, Common, Shares Debt and lease obligation, gross Debt and Lease Obligation, Gross Debt and Lease Obligation, Gross Equity Components [Axis] Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Cash paid for income taxes, net of refunds received Income Tax Paid, after Refund Received 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 Schedule of Notional Amount, Estimated Aggregate Fair Value and Related Balance Sheet Classification of Foreign Currency Derivative Contracts Schedule of Foreign Exchange Contracts, Statement of Financial Position [Table Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Entity Interactive Data Current Entity Interactive Data Current Variable Rate [Axis] Variable Rate [Axis] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Less: Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Comprehensive income attributable to Lear Comprehensive Income (Loss), Net of Tax, Attributable to Parent 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date Property, Plant, and Equipment Property, Plant, and Equipment [Line Items] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Marketable equity securities Marketable Securities Variable Rate Component [Axis] Variable Rate Component [Axis] Variable Rate Component Other Other Assets, Noncurrent Cash Flows from Financing Activities: Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract] Document Type Document Type Other current assets Derivative Asset, Current Accrued liabilities Accrued Liabilities, Current Fair Value as of Grant Date Award Grant Date Fair Value Goodwill [Table] Goodwill [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Remaining repurchase authorization Remaining Purchase Authorization Share Repurchase Program, Remaining Authorized, Amount Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Debt Securities, Trading, and Equity Securities, FV-NI [Table] Local Phone Number Local Phone Number Other Postretirement Other Postretirement Benefits Plan [Member] Work-in-process Inventory, Work in Process, Gross Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Net investment hedge contracts Net investment hedge contracts Net Investment Hedging [Member] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Other Finance Lease Liability And Working Capital Loan Finance Lease Liability And Working Capital Loan Total property, plant and equipment Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Equity in net income of affiliates Income (Loss) from Equity Method Investments Machinery and equipment Machinery and Equipment [Member] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] ARGENTINA ARGENTINA Goodwill Goodwill [Roll Forward] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Schedule 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] Inventories Inventories Inventories Inventory, Net All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Lease obligations under operating leases: Liabilities, Lessee [Abstract] Liabilities, Lessee [Abstract] 2026 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Level 3 Fair Value, Inputs, Level 3 [Member] Movement in Standard Product Warranty Accrual Movement in Standard Product Warranty Accrual [Roll Forward] Supplementary Disclosure: Supplemental Cash Flow Information [Abstract] Number of shares repurchased (in shares) Number of Shares (in shares) Treasury Stock, Shares, Acquired PEO Name PEO Name Geographical [Axis] Geographical [Axis] Significant contract liabilities recorded Contract with Customer, Liability Derivative instruments and hedging: Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] 3.8% Senior Notes due 2027 (the "2027 Notes") Senior Notes Due Two Thousand Twenty Seven [Member] Senior Notes Due Two Thousand Twenty Seven [Member] Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Gains (losses) recognized in accumulated other comprehensive loss Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax Entity Tax Identification Number Entity Tax Identification Number Seating Seating Seating Seating Segment [Member] Seating [Member] Contract termination (credits) costs Business Exit Costs Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Repurchase of shares of common stock Aggregate repurchases Treasury Stock, Value, Acquired, Cost Method Payments, utilizations and foreign currency Payments for Restructuring Cash, Cash Equivalents and Restricted Cash as of Beginning of Period Cash, Cash Equivalents and Restricted Cash as of End of Period Cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Accounts payable Increase (Decrease) in Accounts Payable Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code ABR and Canadian Prime Rate Loans Base Rate [Member] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Consolidated comprehensive income (Condensed Consolidated Statements of Equity) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Total lease expense Lease, Cost Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Leases Lessee, Operating Leases [Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic net income per share attributable to Lear (in dollars per share) Earnings Per Share, Basic Raw materials Inventory, Raw Materials, Gross Repurchases of common stock Cash paid for Repurchases Payments for Repurchase of Common Stock Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Thereafter Lessee, Operating Lease, Liability, to be Paid, After Year Four Lessee, Operating Lease, Liability, to be Paid, After Year Four Award Type Award Type [Axis] Foreign currency contracts Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Short-term lease expense Short-Term Lease, Cost Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current Schedule of Common Stock Repurchase Program Class of Treasury Stock [Table Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Restricted cash included in other long-term assets Restricted Cash, Noncurrent Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Pension Pension Plan [Member] Common Stock Common Stock [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Operating lease expense Operating Lease, Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Derivative Contract [Domain] Derivative Contract [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Other long-term liabilities Derivative Liability, Noncurrent Total liabilities and equity Liabilities and Equity Variable lease expense Variable Lease, Cost Employee Stock Option Share-Based Payment Arrangement, Option [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Tabular List, Table Tabular List [Table Text Block] Additional paid-in capital Additional Paid in Capital Lear Corporation Shareholders' Equity Parent [Member] Name Awards Close in Time to MNPI Disclosures, Individual Name EQUITY: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] LONG-TERM ASSETS: Assets, Noncurrent [Abstract] Property, plant and equipment Property, Plant and Equipment [Member] Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Derivatives, Fair Value Derivatives, Fair Value [Line Items] Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Preferred stock, 100,000,000 shares authorized (including 10,896,250 Series A convertible preferred stock); no shares outstanding Preferred Stock, Value, Issued Pre-Production Costs Related to Long-Term Supply Agreements Property, Plant and Equipment, Preproduction Design and Development Costs [Policy Text Block] Adjustment to Compensation: Adjustment to Compensation [Axis] Reclassification adjustments Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Accrued liabilities and other Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Hedging Designation [Domain] Hedging Designation [Domain] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Class of Stock [Domain] Class of Stock [Domain] Restructuring Cost and Reserve Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of cash flows: Statement of Cash Flows [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Credit Facility [Axis] Credit Facility [Axis] Restructuring Restructuring and Related Activities Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Long-term debt Long-term debt Long-Term Debt and Lease Obligation Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable and drafts Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument Debt Instrument [Line Items] 2.6% Senior Notes due 2032 (the "2032 Notes") Senior Notes Due Two Thousand Thirty Two [Member] Senior Notes Due Two Thousand Thirty Two [Member] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Comprehensive income Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Retirement Plan Type [Domain] Retirement Plan Type [Domain] Additional Paid-In Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Goodwill, impairment Goodwill, Impairment Loss Foreign currency translation and other Goodwill, Foreign Currency Translation And Other Changes Goodwill, Foreign Currency Translation And Other Changes Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Capitalized pre-production tooling costs related to customer-owned tools Preproduction Tooling Costs Related To Long Term Supply Arrangements Costs Capitalized Amount of recoverable preproduction tooling costs related to long term supply agreements capitalized during the reporting period. Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Company Selected Measure Amount Company Selected Measure Amount Schedule of Reconciliation of Segment Earnings to Consolidated Income Before Provision for Income Taxes and Equity Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Depreciation and amortization Depreciation, Depletion and Amortization Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Credit Agreement — Revolving Credit Facility Credit Agreement - Revolving Credit Facility [Member] Credit Agreement - Revolving Credit Facility [Member] Net issuances of shares held in treasury in settlement of stock-based compensation (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Consolidated net income Consolidated net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest CURRENT ASSETS: Assets, Current [Abstract] Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Right-of-use assets obtained in exchange for operating lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability North America North America [Member] Provision for income taxes Provision for income taxes Income Tax Expense (Benefit) Foreign currency transaction losses Gain (Loss), Foreign Currency Transaction, before Tax Other Expense, Net Other Income and Other Expense Disclosure [Text Block] Net income Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Cost of sales Cost of sales Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Outstanding maturities in months, not to exceed Derivative, Remaining Maturity Consolidation Consolidation, Policy [Policy Text Block] 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 Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Amortization of actuarial (loss) gain Defined Benefit Plan, Amortization of Gain (Loss) Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Net income attributable to Lear Net income attributable to Lear Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Location, Statement of Financial Position, Balance [Axis] Location, Statement of Financial Position, Balance [Axis] Statement [Table] Statement [Table] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Restatement Determination Date: Restatement Determination Date [Axis] Additional Property, Plant and Equipment Property, Plant and Equipment, Other Types [Member] Schedule of Changes, Net of Tax, in Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Other Expense, Net Schedule Of Other Income Expense Net [Table Text Block] Tabular disclosure of amounts recorded as other income or other expense items (both operating and nonoperating). Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] 5.25% Senior Notes due 2049 (the "2049 Notes") Senior Notes Due Two Thousand Forty Nine [Member] Senior Notes Due Two Thousand Forty Nine [Member] Foreign currency translation adjustments related to derivatives in net investment hedge (loss) gain Net investment hedge contracts Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax Derivative contracts classified within Level 3 of fair value hierarchy Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Unusual or Infrequent Item, or Both Unusual or Infrequent Item, or Both [Line Items] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]