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FINANCIAL RISK MANAGEMENT (Details) - Schedule of level of hedge | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of level of hedge [Abstract] |  |  |  |  |  |  |  |  |  |
Percentage of coverage over the expected volume of consumption | 19.00% | 20.00% | 61.00% | 65.00% | 15.00% | 40.00% | 58.00% | 66.00% | 41.00% | 45.00%

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- Definition It represents the percentage of hedge expected consumption value. + References No definition available. + Details
Name: | ltm_PercentageOfHedgeOfExpectedConsumptionValue
Namespace Prefix: | ltm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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