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v2.4.1.9

Debt - Additional Information (Detail) (USD $) | 3 Months Ended | 1 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 28, 2015 | Mar. 29, 2014 | Mar. 29, 2014 | Mar. 28, 2015 | Jan. 31, 2015 | Nov. 30, 2014 | Jan. 05, 2015 | Dec. 31, 2014 | Oct. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  | $ (17,500,000)us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  |  |
Restricted cash disbursements for repurchase of senior notes | 250,000,000 lea_RestrictedCashDisbursementsforRepaymentsofSeniorDebt | 0 lea_RestrictedCashDisbursementsforRepaymentsofSeniorDebt |  |  |  |  |  |  |
Restricted cash disbursed for acquisition of Eagle Ottawa | 350,000,000 lea_RestrictedCashDisbursementstoAcquireBusiness | 0 lea_RestrictedCashDisbursementstoAcquireBusiness |  |  |  |  |  |  |
Credit agreement borrowings | 500,000,000 us-gaap_ProceedsFromRepaymentsOfOtherDebt | 0 us-gaap_ProceedsFromRepaymentsOfOtherDebt |  |  |  |  |  |  |
Percentage owned, domestic subsidiaries | 1 lea_PercentageOwnedDomesticSubsidiaries |  |  |  |  |  |  |  |
4.75% Senior Notes due 2023 | Senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount | 500,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  | 500,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |
Long-term debt, stated coupon rate | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
5.375% Senior Notes due 2024 | Senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount | 325,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  | 325,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |
Long-term debt, stated coupon rate | 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  | 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  | 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Proceeds from offering |  |  | 325,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |
Debt issuance cost |  |  | 3,800,000 us-gaap_DebtIssuanceCosts / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |
5.375% Senior Notes due 2024 | Senior notes | Unsecured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Cash paid for debt redemption |  | 327,100,000 us-gaap_RepaymentsOfUnsecuredDebt / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_ExtinguishmentOfDebtAxis = us-gaap_UnsecuredDebtMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  | (17,500,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_ExtinguishmentOfDebtAxis = us-gaap_UnsecuredDebtMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |
7.875% Senior Notes due 2018 | Senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, stated coupon rate |  | 7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |
Payment for redemption of aggregate principal amount |  | 280,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 280,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandEighteenMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |
8.125% Senior Notes due 2020 | Senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, stated coupon rate | 8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  | 8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  | 8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Payment for redemption of aggregate principal amount | 245,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 35,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 35,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 245,000,000 us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |
Percentage of debt redemption |  |  | 10.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 104.063%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |
Restricted cash disbursements for repurchase of senior notes |  |  |  | 250,000,000 lea_RestrictedCashDisbursementsforRepaymentsofSeniorDebt / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |
8.125% Senior Notes due 2020 | Senior notes | Unsecured Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt | (14,300,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_ExtinguishmentOfDebtAxis = us-gaap_UnsecuredDebtMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | 255,000,000 us-gaap_RepaymentsOfSeniorDebt / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_ExtinguishmentOfDebtAxis = us-gaap_UnsecuredDebtMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |
5.25% Senior Notes due 2025 | Eagle Ottawa |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash disbursed for acquisition of Eagle Ottawa |  |  |  |  | 350,000,000 lea_RestrictedCashDisbursementstoAcquireBusiness / us-gaap_BusinessAcquisitionAxis = lea_EagleOttawaMember / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember |  |  |  |
5.25% Senior Notes due 2025 | Senior notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount | 650,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  | 650,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |
Long-term debt, stated coupon rate | 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  | 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Proceeds from offering |  |  |  |  |  | 650,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |
Debt issuance cost |  |  |  |  |  | 8,400,000 us-gaap_DebtIssuanceCosts / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |
Credit Agreement — Term Loan Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit agreement borrowings |  |  |  |  |  |  | 500,000,000 us-gaap_ProceedsFromRepaymentsOfOtherDebt / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember |  |
Credit Agreement — Term Loan Facility | Term Loan Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Credit agreement borrowings | 500,000,000 us-gaap_ProceedsFromRepaymentsOfOtherDebt / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount |  |  |  |  |  | 500,000,000 us-gaap_LoansPayable / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember |  |  |
Credit Agreement — Term Loan Facility | Term Loan Facility | Eurocurrency Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Minimum interest rate margin | 1.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember |  |  |  |  |  |  |  |
Maximum interest rate margin | 2.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember |  |  |  |  |  |  |  |
Line of credit facility, interest rate at period end | 1.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember |  |  | 1.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember |  |  |  |  |
Credit Agreement — Term Loan Facility | Term Loan Facility | Adjusted Base Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Minimum interest rate margin | 0.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  |  |  |  |  |  |
Maximum interest rate margin | 1.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  |  |  |  |  |  |
Line of credit facility, interest rate at period end | 0.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  | 0.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  |  |  |
Credit Agreement — Term Loan Facility | Eagle Ottawa |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from borrowings under Term Loan Facility |  |  |  |  | 500,000,000 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_BusinessAcquisitionAxis = lea_EagleOttawaMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember |  |  |  |
Credit agreement- revolving credit facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | 1,250,000,000.00 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = lea_CreditagreementrevolvingcreditfacilityMember |  |  | 1,000,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = lea_CreditagreementrevolvingcreditfacilityMember
Credit agreement- revolving credit facility | Minimum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, facility fee | 0.25%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = lea_CreditagreementrevolvingcreditfacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |
Credit agreement- revolving credit facility | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit facility, facility fee | 0.50%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = lea_CreditagreementrevolvingcreditfacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |
Credit agreement- revolving credit facility | Eurocurrency Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Minimum interest rate margin | 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_DebtInstrumentAxis = lea_CreditagreementrevolvingcreditfacilityMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember |  |  |  |  |  |  |  |
Maximum interest rate margin | 2.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_DebtInstrumentAxis = lea_CreditagreementrevolvingcreditfacilityMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember |  |  |  |  |  |  |  |
Line of credit facility, interest rate at period end | 1.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = lea_CreditagreementrevolvingcreditfacilityMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember |  |  | 1.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = lea_CreditagreementrevolvingcreditfacilityMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember |  |  |  |  |
Credit agreement- revolving credit facility | Adjusted Base Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Minimum interest rate margin | 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_DebtInstrumentAxis = lea_CreditagreementrevolvingcreditfacilityMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  |  |  |  |  |  |
Maximum interest rate margin | 1.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_DebtInstrumentAxis = lea_CreditagreementrevolvingcreditfacilityMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  |  |  |  |  |  |
Line of credit facility, interest rate at period end | 0.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = lea_CreditagreementrevolvingcreditfacilityMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  | 0.50%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = lea_CreditagreementrevolvingcreditfacilityMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  |  |  |
Credit agreement- revolving credit facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings outstanding under revolving credit facility | $ 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = lea_CreditagreementrevolvingcreditfacilityMember |  |  | $ 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = lea_CreditagreementrevolvingcreditfacilityMember |  |  |  | 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = lea_CreditagreementrevolvingcreditfacilityMember |
Credit Agreement | Domestic subsidiaries |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Percentage of stock secured on a first priority basis | 100.00%lea_PercentageOfStock / us-gaap_DebtInstrumentAxis = lea_CreditAgreementMember / dei_LegalEntityAxis = lea_DomesticSubsidiariesMember |  |  | 100.00%lea_PercentageOfStock / us-gaap_DebtInstrumentAxis = lea_CreditAgreementMember / dei_LegalEntityAxis = lea_DomesticSubsidiariesMember |  |  |  |  |
Credit Agreement | Foreign subsidiaries |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Percentage of stock secured on a first priority basis | 65.00%lea_PercentageOfStock / us-gaap_DebtInstrumentAxis = lea_CreditAgreementMember / dei_LegalEntityAxis = lea_ForeignSubsidiariesMember |  |  | 65.00%lea_PercentageOfStock / us-gaap_DebtInstrumentAxis = lea_CreditAgreementMember / dei_LegalEntityAxis = lea_ForeignSubsidiariesMember |  |  |  |  |

X
- Definition Percentage of stock of subsidiaries that secure on a first priority basis of the Amended and Restated Credit Agreement. + References No definition available. + Details
Name: | lea_PercentageOfStock
Namespace Prefix: | lea_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage ownership by Lear of domestic subsidiaries who are guarantors + References No definition available. + Details
Name: | lea_PercentageOwnedDomesticSubsidiaries
Namespace Prefix: | lea_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Restricted Cash Disbursements for Repayments of Senior Debt + References No definition available. + Details
Name: | lea_RestrictedCashDisbursementsforRepaymentsofSeniorDebt
Namespace Prefix: | lea_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Restricted Cash Disbursements to Acquire Business + References No definition available. + Details
Name: | lea_RestrictedCashDisbursementstoAcquireBusiness
Namespace Prefix: | lea_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Maximum contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Minimum contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Percentage of principal amount of debt redeemed. + References No definition available. + Details
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- Definition Face (par) amount of the original debt instrument that was repurchased. + References No definition available. + Details
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- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 + Details
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- Definition The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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