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Investments in Affiliates and Other Related Party Transactions - Beneficial Ownership in Affiliates Accounted for under Equity Method (Detail)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Shanghai Lear STEC Automotive Parts Co., Ltd. (China)
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	55.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ShanghaiLearStecAutomotivePartsCoLimitedMember	55.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ShanghaiLearStecAutomotivePartsCoLimitedMember	55.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ShanghaiLearStecAutomotivePartsCoLimitedMember
Beijing BAI Lear Automotive Systems Co., Ltd. (China)
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingBaiLearAutomotiveSystemsCoLimitedMember	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingBaiLearAutomotiveSystemsCoLimitedMember	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingBaiLearAutomotiveSystemsCoLimitedMember
Beijing Lear Automotive Electronics and Electrical Products Co., Ltd. (China)
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingLearAutomotiveElectronicsAndElectricalProductsCoLtdMember	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingLearAutomotiveElectronicsAndElectricalProductsCoLtdMember	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingLearAutomotiveElectronicsAndElectricalProductsCoLtdMember
Dong Kwang Lear Yuhan Hoesa (Korea)
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_DongKwangLearYuhanHoesaMember	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_DongKwangLearYuhanHoesaMember	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_DongKwangLearYuhanHoesaMember
Industrias Cousin Freres, S.L. (Spain)
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_IndustriasCousinFreresSociedadLimitadaMember	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_IndustriasCousinFreresSociedadLimitadaMember	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_IndustriasCousinFreresSociedadLimitadaMember
Jiangxi Jiangling Lear Interior Systems Co., Ltd. (China)
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_JiangxiJianglingLearInteriorSystemsCoLtdMember	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_JiangxiJianglingLearInteriorSystemsCoLtdMember	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_JiangxiJianglingLearInteriorSystemsCoLtdMember
Lear Dongfeng Automotive Seating Co., Ltd. (China)
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_LearDongfengAutomotiveSeatingCoLtdMember	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_LearDongfengAutomotiveSeatingCoLtdMember	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_LearDongfengAutomotiveSeatingCoLtdMember
Changchun Lear FAWSN Automotive Electrical and Electronics Co., Ltd. (China)
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ChangchunLearFawSihuanAutomotiveElectricalAndElectronicsCoLimitedMember	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ChangchunLearFawSihuanAutomotiveElectricalAndElectronicsCoLimitedMember	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ChangchunLearFawSihuanAutomotiveElectricalAndElectronicsCoLimitedMember
Changchun Lear FAWSN Automotive Seat Systems Co., Ltd. (China)
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ChangchunLearFawSihuanAutomotiveSeatSystemsCoLtdMember	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ChangchunLearFawSihuanAutomotiveSeatSystemsCoLtdMember	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ChangchunLearFawSihuanAutomotiveSeatSystemsCoLtdMember
Honduras Electrical Distribution Systems S. de R.L. de C.V. (Honduras)
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_HondurasElectricalDistributionSystemsSociedadDeResponsabilidadLimitadaDeCapitalVariableMember	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_HondurasElectricalDistributionSystemsSociedadDeResponsabilidadLimitadaDeCapitalVariableMember	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_HondurasElectricalDistributionSystemsSociedadDeResponsabilidadLimitadaDeCapitalVariableMember
Kyungshin-Lear Sales and Engineering LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_KyungshinLearSalesAndEngineeringLimitedLiabilityCompanyMember	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_KyungshinLearSalesAndEngineeringLimitedLiabilityCompanyMember	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_KyungshinLearSalesAndEngineeringLimitedLiabilityCompanyMember
Beijing Lear Dymos Automotive Systems Co., Ltd. (China)
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingLearDymosAutomotiveSystemsCoLtdMember	40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingLearDymosAutomotiveSystemsCoLtdMember	40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_BeijingLearDymosAutomotiveSystemsCoLtdMember
Dymos Lear Automotive India Private Limited (India)
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_DymosLearAutomotiveIndiaPrivateLimitedMember	35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_DymosLearAutomotiveIndiaPrivateLimitedMember	35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_DymosLearAutomotiveIndiaPrivateLimitedMember
eLumigen, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	30.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ElumigenLimitedLiabilityCompanyMember	15.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ElumigenLimitedLiabilityCompanyMember	0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_ElumigenLimitedLiabilityCompanyMember
RevoLaze, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_RevolazeLimitedLiabilityCompanyMember	20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_RevolazeLimitedLiabilityCompanyMember	0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_RevolazeLimitedLiabilityCompanyMember
HB Polymer Company, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	10.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_HbPolymerLimitedLiabilityCompanyMember	10.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_HbPolymerLimitedLiabilityCompanyMember	0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_HbPolymerLimitedLiabilityCompanyMember
Tacle Seating USA, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_TacleSeatingUnitedStatesOfAmericaLimitedLiabilityCompanyMember	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_TacleSeatingUnitedStatesOfAmericaLimitedLiabilityCompanyMember	49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_TacleSeatingUnitedStatesOfAmericaLimitedLiabilityCompanyMember
International Automotive Components Group North America, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage of affiliates	0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_InternationalAutomotiveComponentsGroupNorthAmericaLimitedLiabilityCompanyMember	0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_InternationalAutomotiveComponentsGroupNorthAmericaLimitedLiabilityCompanyMember	23.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = lea_InternationalAutomotiveComponentsGroupNorthAmericaLimitedLiabilityCompanyMember

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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