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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)