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ACCOUNTING ESTIMATES AND JUDGMENTS (Details Narrative) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of detailed information about intangible assets [line items]        
Goodwill $ 2,672,550 $ 2,710,382 $ 2,280,575 $ 3,313,401
Deferred tax assets 364,021 384,580    
Recognize deferred tax assets for tax losses (45,991) (73,814) 270,904  
Deferred revenue $ 1,550,447 1,535,229    
Description of change in ticket usage

An hypothetical change of 1% in passenger behavior regarding to the ticket usage,—that is, if during the next six months after sells probability of used were 89% rather than 90%, as we consider, it would lead to a change in the expiry period from six to seven months, which, as of December 31, 2016, would have an impact of up to ThUS$ 20,000.

      
Impact of fair value of unused kilometers $ 8,000 8,400    
Air Transport CGU [Member]        
Disclosure of detailed information about intangible assets [line items]        
Goodwill 2,146,692 2,176,634 1,835,088 2,658,503
Coalition and Loyalty Program Multiplus CGU [Member]        
Disclosure of detailed information about intangible assets [line items]        
Goodwill 525,858 533,748 $ 445,487 $ 654,898
Airport Slots [Member] | Air Transport CGU [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets with indefinite useful life 964,513 978,849    
Airport Slots [Member] | Coalition and Loyalty Program Multiplus CGU [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets with indefinite useful life    
LATAM Fidelidade and Multiplus Loyalty Program [Member]        
Disclosure of detailed information about intangible assets [line items]        
Deferred revenue 364,866 392,107    
Probable change in deferred revenue 16,700 14,639    
Loyalty Program [Member] | Air Transport CGU [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets with indefinite useful life      
Loyalty Program [Member] | Coalition and Loyalty Program Multiplus CGU [Member]        
Disclosure of detailed information about intangible assets [line items]        
Intangible assets with indefinite useful life 321,440 326,262    
LATAM Pass Loyalty Program [Member]        
Disclosure of detailed information about intangible assets [line items]        
Deferred revenue 853,505 896,190    
Probable change in deferred revenue $ 25,000 $ 30,632    
Trade Marks [Member]        
Disclosure of detailed information about intangible assets [line items]        
Estimated useful life of brands from indefinite useful life 5 years