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COSTS AND EXPENSES BY NATURE (Details) - Schedule of operating costs and administrative expenses - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of operating costs and administrative expenses [Abstract] |  |  |  |
Aircraft fuel |  | $ 1,487,776 | $ 1,045,343 | $ 2,929,008
Other rentals and landing fees | [1] | 755,188 | 720,005 | 1,275,859
Aircraft rentals | [2] | 120,630 |  |
Aircraft maintenance |  | 533,738 | 472,382 | 444,611
Commissions |  | 89,208 | 91,910 | 221,884
Passenger services |  | 77,363 | 97,688 | 261,330
Other operating expenses |  | 959,427 | 1,221,183 | 1,291,895
Total |  | $ 4,023,330 | $ 3,648,511 | $ 6,424,587
[1] | Lease expenses are included within this amount (See Note 2.21)
[2] | During 2021, the Company amended its Aircraft Lease Contracts which included lease payment based on Power by the Hour (PBH) at the beginning of the contract and then switches to fixed-rent payments. A right of use asset and a lease liability was recognized as result of those amendments at the date of modification of the contract, even if they initially have a variable payment period. As a result of the application of the lease accounting policy, the right of use assets continues to be amortized on a straight-line basis over the term of the lease from the contract modification date. The expenses for the year include both: the lease expense for variable payments (Aircraft Rentals) as well as the expenses resulting from the amortization of the right of use assets from the beginning of the contract (included in the Depreciation line b) below) and interest from the lease liability (included in Lease Liabilities c) below).

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- Definition The amount of all operating expenses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_85&doctype=Standard -URIDate 2021-03-24 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The amount of operating income (expense) that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_85&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition It represents the amount of aircraft fuel expense. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition It represents the amount of aircraft maintenance expense. + References No definition available. + Details
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Namespace Prefix: | ltm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition It represents the amount of comissions expense. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition It represents the amount of other rentals and landing fees expense. + References No definition available. + Details
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- Definition It represents the amount of passenger services expense. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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