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TRADE AND OTHER ACCOUNTS RECEIVABLE CURRENT, AND NON-CURRENT ACCOUNTS RECEIVABLE (Details) - Schedule of allowance for impairment loss of trade and other accounts receivables - Accumulated impairment [member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
TRADE AND OTHER ACCOUNTS RECEIVABLE CURRENT, AND NON-CURRENT ACCOUNTS RECEIVABLE (Details) - Schedule of allowance for impairment loss of trade and other accounts receivables [Line Items] |  |  |  |
Opening balance |  | $ (97,991) | $ (87,909) | $ (77,054)
Adoption adjustment IFRS 9 | [1] |  | (10,524) |
Write-offs |  | 12,569 | 8,620 | 8,249
(Increase) Decrease |  | (14,980) | (8,178) | (19,104)
Closing balance |  | $ (100,402) | $ (97,991) | $ (87,909)
[1] | Adjustment to the balance as of December 31, 2017 registered in retained earnings as of 01.01.2018 for the adoption of IFRS 9.

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- Definition The amount recognised as allowance for impairment loss after adoption adjustments. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of increase decrease allowance for credit losses related to receivables. + References No definition available. + Details
Name: | ltm_IncreaseDecreaseAllowanceForImpairmentLoss
Namespace Prefix: | ltm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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- Definition It represents the amount of trade receivables allowance for impairment loss. + References No definition available. + Details
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Namespace Prefix: | ltm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of write off allowance for credit losses related to receivables. + References No definition available. + Details
Name: | ltm_WriteOffsAllowanceForImpairmentLoss
Namespace Prefix: | ltm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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