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ACCOUNTING ESTIMATES AND JUDGMENTS (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
ACCOUNTING ESTIMATES AND JUDGMENTS (Details) [Line Items] |  |  |  |  |
Goodwill | $ 2,209,576 | $ 2,294,072 |  | $ 2,672,550 | $ 2,710,382
Deferred tax assets | 235,583 | 273,529 | $ 370,115 | $ 370,564 |
Recognize deferred tax assets for tax losses | 110,933 | 137,761 |  |  |
Deferred revenue | $ 1,511,991 | 1,299,304 |  |  |
Description of change in ticket usage | A hypothetical change of one percentage point in passenger behavior with respect to use would result in an impact of up to ThUS$ 6,000 per month. |  |  |  |
Lease liabilities | $ 105,000 |  |  |  |
Airports Slots [Member] | Air Transport CGU [Member] |  |  |  |  |
ACCOUNTING ESTIMATES AND JUDGMENTS (Details) [Line Items] |  |  |  |  |
Intangible assets with indefinite useful life | 845,959 | 828,969 |  |  |
Airports Slots [Member] | Coalition and Loyalty Program Multiplus CGU [Member] |  |  |  |  |
ACCOUNTING ESTIMATES AND JUDGMENTS (Details) [Line Items] |  |  |  |  |
Intangible assets with indefinite useful life |  |  |  |  |
Loyalty Program [Member] | Air Transport CGU [Member] |  |  |  |  |
ACCOUNTING ESTIMATES AND JUDGMENTS (Details) [Line Items] |  |  |  |  |
Intangible assets with indefinite useful life | 263,806 |  |  |  |
Loyalty Program [Member] | Coalition and Loyalty Program Multiplus CGU [Member] |  |  |  |  |
ACCOUNTING ESTIMATES AND JUDGMENTS (Details) [Line Items] |  |  |  |  |
Intangible assets with indefinite useful life |  | 274,420 |  |  |
LATAM Pass Loyalty Program [Member] |  |  |  |  |
ACCOUNTING ESTIMATES AND JUDGMENTS (Details) [Line Items] |  |  |  |  |
Deferred revenue | 1,332,173 | 1,324,635 |  |  |
Probable change in deferred revenue | 31,565 | 27,726 |  |  |
LATAM Fidelidade and Multiplus Loyalty Program [Member] |  |  |  |  |
ACCOUNTING ESTIMATES AND JUDGMENTS (Details) [Line Items] |  |  |  |  |
Deferred revenue | 354,847 | 293,831 |  |  |
Probable change in deferred revenue | 12,501 | 13,140 |  |  |
Financial assets collectively assessed for credit losses [member] | Loyalty Program [Member] | Coalition and Loyalty Program Multiplus CGU [Member] |  |  |  |  |
ACCOUNTING ESTIMATES AND JUDGMENTS (Details) [Line Items] |  |  |  |  |
Intangible assets with indefinite useful life | $ 263,806 | $ 274,420 |  |  |

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