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SHARE-BASED PAYMENTS (Details) - Schedule of acquisition of the share’s rights - Multiplus S.A. [Member] - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
SHARE-BASED PAYMENTS (Details) - Schedule of acquisition of the share’s rights [Line Items]
Number of shares Accrued options		247,500
Number of shares Non accrued options		247,500

X

- Definition

Number of shares Accrued options.

+ References

No definition available.

+ Details

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Namespace Prefix:	ltm_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of shares Non accrued options.

+ References

No definition available.

+ Details

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Namespace Prefix:	ltm_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	ltm_SHAREBASEDPAYMENTSDetailsScheduleofacquisitionofthesharesrightsLineItems
Namespace Prefix:	ltm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=ltm_MultiplusSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: