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GENERAL INFORMATION (Details Narrative)
$ in Thousands
 12 Months Ended
Apr. 02, 2016
Jan. 16, 2016
shares
Dec. 31, 2017
USD ($)
Employee
shares
Dec. 11, 2017
shares
Dec. 31, 2016
shares
Aug. 18, 2016
shares
Dec. 31, 2015
shares
Disclosure of subsidiaries [line items]              
Number of revised authorized shares capital stock     608,374,525   608,374,525   551,847,819
Number of average employees | Employee     43,593        
Number of employees | Employee     43,095        
Administrative Staff [Member]              
Disclosure of subsidiaries [line items]              
Number of employees | Employee     6,922        
Maintenance Staff [Member]              
Disclosure of subsidiaries [line items]              
Number of employees | Employee     4,742        
Operations Staff [Member]              
Disclosure of subsidiaries [line items]              
Number of employees | Employee     15,126        
Cabin Crew [Member]              
Disclosure of subsidiaries [line items]              
Number of employees | Employee     9,016        
Controls Crew [Member]              
Disclosure of subsidiaries [line items]              
Number of employees | Employee     3,957        
Sales Staff [Member]              
Disclosure of subsidiaries [line items]              
Number of employees | Employee     3,332        
Cueto Group [Member]              
Disclosure of subsidiaries [line items]              
Percentage of ownership interest holding by controlling shareholder     27.91%        
1485 Registered Shareholders [Member]              
Disclosure of subsidiaries [line items]              
Percentage of share capital in form of ADRs     4.14%        
Common/Ordinary Shares [Member]              
Disclosure of subsidiaries [line items]              
Number of shares subscribed and paid capital     606,407,693   606,407,693    
Number of shares issued           61,316,424  
Number of shares placed     60,849,592        
Number of revised authorized shares capital stock     608,374,525   61,316,424    
Number of shares pending of subscription and payment     1,966,832   4,789,718    
Number of shares allocated for stock option plan     1,500,000        
Number of balances shares for placement of the last capital increase     466,832        
Number of previously authorized shares capital stock         613,164,243    
Number of shares for subscription and payment expired     30,499,685   4,789,718    
TAM S.A. and Subsidiaries [Member]              
Disclosure of subsidiaries [line items]              
Number of balances shares for placement of the last capital increase       210,000      
Lan Pax Group S.A. and Subsidiaries [Member] | Class C [Member]              
Disclosure of subsidiaries [line items]              
Number of shares placed   90,000,000          
Percentage of equity ownership   99.8656%          
Percentage of ownership chages for capital increase   4.87%          
Peuco Finance Limited [Member]              
Disclosure of subsidiaries [line items]              
Percentage of equity ownership     100.00%        
Inmobiliaria Aeronautica S.A. [Member]              
Disclosure of subsidiaries [line items]              
Percentage of equity ownership     100.00%        
Rampas Andes Airport Services S.A. [Member]              
Disclosure of subsidiaries [line items]              
Sale value | $     $ 8,624        
TEP Chile S.A [Member]              
Disclosure of subsidiaries [line items]              
Maximum percentage of voting rights     51.00%        
Number of voting shares hold     938        
Holdco I S.A [Member] | TAM S.A. and Subsidiaries [Member]              
Disclosure of subsidiaries [line items]              
Percentage of economic rights     99.99%        
Percentage of rights politicians product     49.00%        
Maximum percentage of voting rights     49.00%        
Number of voting shares hold     901        
Aerovias de Integracion Regional, AIRES S.A. [Member] | Inversiones Lan S.A. and Subsidiaries [Member]              
Disclosure of subsidiaries [line items]              
Percentage of equity ownership     99.1941%        
Decrease in ownership interest     9.498%        
Number of shares acquired     4,951        
Multiplus Corretora de Seguros Ltda [Member] | TAM S.A. and Subsidiaries [Member]              
Disclosure of subsidiaries [line items]              
Percentage of equity ownership 99.99%            
Multiplus Corretora de Seguros Ltda [Member] | TAM S.A. and Subsidiaries [Member] | Prismah Fidelidade Ltda [Member]              
Disclosure of subsidiaries [line items]              
Percentage of equity ownership     99.99%