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Impact of COVID-19 Pandemic - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Government Assistance, Cares Act |
Unusual or Infrequent Item, or Both [Line Items] |
Proceeds from government assistance | $ 98

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- Definition Proceeds from Government Assistance + References No definition available. + Details
Name: | lear_ProceedsFromGovernmentAssistance
Namespace Prefix: | lear_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_UnusualOrInfrequentItemLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | lear_GovernmentAssistanceAxis=lear_GovernmentAssistanceCARESActMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |