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INVESTMENTS IN SUBSIDIARIES (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Lan Peru S.A. [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Country of incorporation |  | Peru | Peru |
Functional currency |  | US$ | US$ |
Percentage of equity ownership |  | 70.00% | 70.00% | 70.00%
Lan Cargo S.A. [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Country of incorporation |  | Chile | Chile |
Functional currency |  | US$ | US$ |
Percentage of equity ownership |  | 99.898% | 99.898% | 99.898%
Lan Argentina S.A. [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Country of incorporation |  | Argentina | Argentina |
Functional currency |  | ARS | ARS |
Percentage of equity ownership |  | 99.8656% | 99.8656% |
Transporte Aereo S.A. [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Country of incorporation |  | Chile | Chile |
Functional currency |  | US$ | US$ |
Percentage of equity ownership |  | 100.00% | 100.00% | 100.00%
Aerolane Lineas Aereas Nacionales del Ecuador S.A. [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Country of incorporation |  | Ecuador | Ecuador |
Functional currency |  | US$ | US$ |
Percentage of equity ownership |  | 100.00% | 100.00% |
Aerovias de Integracion Regional, AIRES S.A. [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Country of incorporation |  | Colombia | Colombia |
Functional currency |  | COP | COP |
Percentage of equity ownership |  | 99.1906% | 99.1906% |
TAM S.A. and Subsidiaries [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Country of incorporation |  | Brazil | Brazil |
Functional currency |  | BRL | BRL |
Percentage of equity ownership | [1] | 100.00% | 99.9993% | 99.9993%
[1] | As of December 31, 2017, indirect ownership participation on TAM S.A and subsidiaries is from Holdco I S.A., LATAM is entitled to 99,9983% of the economic rights and 49% of the rights politicians product of provisional measure No. 714 of the Brazilian Government implemented during 2016 which allows foreign capital to have up to 49% of the property.

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