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v3.20.1

SHARE-BASED PAYMENTS (Details) - Schedule of acquisition of the share’s rights - Multiplus S.A. [Member] - shares | 12 Months Ended
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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

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- Definition Number of shares Accrued options. + References No definition available. + Details
Name: | ltm_NumberOfSharesAccruedOption
Namespace Prefix: | ltm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of shares Non accrued options. + References No definition available. + Details
Name: | ltm_NumberOfSharesNonAccruedOption
Namespace Prefix: | ltm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | ltm_SHAREBASEDPAYMENTSDetailsScheduleofacquisitionofthesharesrightsLineItems
Namespace Prefix: | ltm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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