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v3.20.1

OTHER FINANCIAL LIABILITIES (Details) - Schedule of movement of lease liabilities - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Aircraft [member] |  |
OTHER FINANCIAL LIABILITIES (Details) - Schedule of movement of lease liabilities [Line Items] |  |
Opening balance | $ 2,737,809 | $ 3,037,585
Changes | 304,422 | (299,776)
Closing balance | 3,042,231 | 2,737,809
New contracts | 719,525 | 283,620
Renegotiations | (41,535) | (240,047)
Payments | (539,549) | (526,071)
Accrued interest | 165,981 | 174,327
Exchange differences |  |
Cumulative translation adjustment |  |
Other variations |  | 8,395
Others [Member] |  |
OTHER FINANCIAL LIABILITIES (Details) - Schedule of movement of lease liabilities [Line Items] |  |
Opening balance | 120,240 | 109,387
Changes | 9,686 | 10,853
Closing balance | 129,926 | 120,240
New contracts | 23,878 | 36,191
Renegotiations | 12,208 | 1,397
Payments | (37,391) | (30,316)
Accrued interest | 11,968 | 8,623
Exchange differences | 1,614 | (5,667)
Cumulative translation adjustment | (467) |
Other variations | (2,124) | 625
Lease Liability total [Member] |  |
OTHER FINANCIAL LIABILITIES (Details) - Schedule of movement of lease liabilities [Line Items] |  |
Opening balance | 2,858,049 | 3,146,972
Changes | 314,108 | (288,923)
Closing balance | 3,172,157 | 2,858,049
New contracts | 743,403 | 319,811
Renegotiations | (29,327) | (238,650)
Payments | (576,940) | (556,387)
Accrued interest | 177,949 | 182,950
Exchange differences | 1,614 | (5,667)
Cumulative translation adjustment | (467) |
Other variations | $ (2,124) | $ 9,020

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_LeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lease liabilities accrued interest. + References No definition available. + Details
Name: | ltm_AccruedInterest
Namespace Prefix: | ltm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Lease liabilities cumulative translation adjustment. + References No definition available. + Details
Name: | ltm_CumulativeTranslationAdjustment
Namespace Prefix: | ltm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Lease liability exchange differences. + References No definition available. + Details
Name: | ltm_ExchangeDifferences
Namespace Prefix: | ltm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Lease liabilities changes. + References No definition available. + Details
Name: | ltm_LeaseLiabilitiesChanges
Namespace Prefix: | ltm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Operating lease liabilities new contract. + References No definition available. + Details
Name: | ltm_NewContracts
Namespace Prefix: | ltm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | ltm_OTHERFINANCIALLIABILITIESDetailsScheduleofmovementofleaseliabilitiesLineItems
Namespace Prefix: | ltm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease liability other variations. + References No definition available. + Details
Name: | ltm_OtherVariations
Namespace Prefix: | ltm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Lease liabilities payments. + References No definition available. + Details
Name: | ltm_Payments
Namespace Prefix: | ltm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Operating lease liability re-negotiations. + References No definition available. + Details
Name: | ltm_Renegotiations
Namespace Prefix: | ltm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_AircraftMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ltm_OthersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ltm_LeaseLiabilityTotalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |