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GOODWILL (Details) - Schedule of sensitivity analysis of goodwill by CGU - Air Transport CGU [Member]	12 Months Ended
	Dec. 31, 2019
GOODWILL (Details) - Schedule of sensitivity analysis of goodwill by CGU [Line Items]
Increase Maximum WACC	8.50%
Decrease Minimum terminal growth rate	1.00%

X

- Definition

Decrease minimum terminal growth rate.

+ References

No definition available.

+ Details

Name:	ltm_DecreaseMinimumTerminalGrowthRate
Namespace Prefix:	ltm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

It represents the percentage of weighted average cost of capital discount rate.

+ References

No definition available.

+ Details

Name:	ltm_WeightedAverageCostOfCapitalDiscountRate
Namespace Prefix:	ltm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis=ltm_AirTransportCGUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: