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v3.20.1

GOODWILL (Details) - Schedule of sensitivity analysis of goodwill by CGU - Air Transport CGU [Member] | 12 Months Ended
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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%

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- 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

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- 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

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