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EQUITY (Details) - Schedule of movement of authorized shares - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Schedule of movement of authorized shares [Abstract] |  |  |
Opening balance | 606,874,525 | 608,374,525 |
Expired shares intended for compensation plans and others | (466,832) | (1,500,000) | [1]
Closing balance | 606,407,693 | 606,874,525 |
[1] | On June 11, 2018, the term of subscription and payment of 1,500,000 shares to create and implement compensation plans for Company employees expired.

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- Definition The number of shares authorised. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 79 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_79_a_i&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_NumberOfSharesAuthorised
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of expired shares intended for compensation plans. + References No definition available. + Details
Name: | ltm_ExpiredSharesIntendedForCompensationPlans
Namespace Prefix: | ltm_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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