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Impact of COVID-19 Pandemic - Narrative (Details) $ in Millions	9 Months Ended
	Oct. 03, 2020 USD ($)
Government Assistance, CARES Act
Unusual Or Infrequent Item [Line Items]
Proceeds from government assistance	$ 95

X

- Definition

Proceeds from Government Assistance

+ References

No definition available.

+ Details

Name:	lea_ProceedsfromGovernmentAssistance
Namespace Prefix:	lea_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- Details

Name:	lea_GovernmentAssistanceAxis=lea_GovernmentAssistanceCARESActMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: