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FINANCIAL RISK MANAGEMENT (Details) - Schedule of level of hedge	3 Months Ended								12 Months Ended
	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