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EQUITY (Details) - USD ($) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 28, 2018 | Dec. 23, 2018 | Jan. 01, 2018 | Dec. 31, 2016 | Aug. 18, 2016
EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |
Value of shares subscribed and paid capital | $ (178,000) |  |  |  |  |  |  |
Number of shares placed (in shares) (in Shares) |  | 60,849,592 |  |  |  |  |  |
Number of shares for subscription and payment expired |  | $ 1,500,000 |  |  |  |  |  |
Number of additional shares subscription (in shares) (in Shares) |  |  |  | 30,349,907 |  |  |  |
Number of shares pending of subscription and payment (in Shares) | 466,832 |  |  |  |  |  |  |
Number of revised authorized shares capital stock (in shares) (in Shares) | 606,407,693 | 606,874,525 | 608,374,525 |  |  |  |  |
Transactions with non-controlling interest | $ (1,605,000) | $ 79,908,000 | $ 90,457,000 |  |  | $ 91,147,000 | $ 88,644,000 |
Loss due to acquisition on minority interest | (184,135) |  |  |  |  |  |  |
Increase (decrease) by application of new accounting standards |  | (9,548,000) | (245,645,000) |  |  |  |  |
Initial balance Restated |  |  | $ (460,173,000) |  |  |  |  |
Ordinary shares [member] |  |  |  |  |  |  |  |
EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |
Value of shares subscribed and paid capital | $ 3,146,265,000 | $ 3,146,265,000 |  |  |  |  |  |
Number of shares subscribed and paid capital (in shares) (in Shares) | 606,407,693 | 606,407,693 |  |  |  |  |  |
Number of shares issued (in shares) (in Shares) |  |  |  |  |  |  |  | 61,316,424
Number of shares for subscription and payment expired (in shares) (in Shares) |  |  |  |  | 30,499,685 |  |  |
Number of shares for subscription and payment expired |  |  |  |  | $ 304,996,850 |  |  |
Number of additional shares subscription |  |  |  | $ 303,499,070 |  |  |  |
Number of shares pending of subscription and payment (in Shares) | 466,832 |  |  |  |  |  |  |
Number of revised authorized shares capital stock (in shares) (in Shares) | 606,874,525 |  |  |  |  |  |  |
Lan Pax Group S.A. and Subsidiaries [Member] | Aerovias de Integracion Regional Aires [Member] |  |  |  |  |  |  |  |
EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |
Transactions with non-controlling interest | $ (3,480,000) |  |  |  |  |  |  |
Lan Pax Group S.A. and Subsidiaries [Member] | Holdco I S.A [Member] |  |  |  |  |  |  |  |
EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |
Transactions with non-controlling interest | (21,526,000) |  |  |  |  |  |  |
Inversiones Lan S.A. and Subsidiaries [Member] | Aerovias de Integracion Regional Aires [Member] |  |  |  |  |  |  |  |
EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |
Transactions with non-controlling interest | (20,000) |  |  |  |  |  |  |
Aerovias de Integracion Regional Aires [Member] |  |  |  |  |  |  |  |
EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |
Transactions with non-controlling interest | (2,000) |  |  |  |  |  |  |
Aerovias de Integracion Regional Aires [Member] | Lan S.A. [Member] |  |  |  |  |  |  |  |
EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |
Transactions with non-controlling interest | $ (885,000) |  |  |  |  |  |  |
Number Of Shares [Member] |  |  |  |  |  |  |  |
EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |
Number of shares subscribed and paid capital (in shares) (in Shares) | 606,407,693 | 606,407,693 | 606,407,693 |  |  |  |  |
Issuance Cost |  |  | $ 3,299,000 |  |  |  |  |
Increase (decrease) by transfers and other changes (in shares) (in Shares) |  |  | 10,282 |  |  |  |  |
Movement Value Of Shares [Member] |  |  |  |  |  |  |  |
EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) by transfers and other changes |  |  | $ 156,000 |  |  |  |  |
Retained earnings [member] |  |  |  |  |  |  |  |
EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) by transfers and other changes |  | $ 4,752,000,000 |  |  |  |  |  |
Increase (decrease) by application of new accounting standards |  | $ (9,548,000) | $ (460,173,000) |  |  |  |  |

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