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GENERAL INFORMATION (Details)
 1 Months Ended 12 Months Ended
Dec. 22, 2020
shares
Dec. 18, 2020
shares
Dec. 16, 2020
shares
Jan. 21, 2021
Dec. 22, 2020
Mar. 23, 2020
Dec. 31, 2021
shares
Dec. 31, 2018
GENERAL INFORMATION (Details) [Line Items]                
Total shareholders (in Shares)             4,828  
Number of average employees             28,600  
Number of employees             29,114  
Description of inversiones         On December 22, 2020, Inversiones Aéreas S.A. carries out a capital increase for 9,504,335 shares, consequently its shareholding composition as follows: LATAM Airlines Group S.A. with 33.41%, Línea Aérea Carguera de Colombia S.A. with 66.43% and Mas Investment Limited with 0.16%.      
Delta Air Lines [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Percentage of ownership shares issued             20.00%  
Cueto Group [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Percentage of ownership shares issued             16.39%  
Shareholders [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Percentage of share capital in form of ADRs             13.07%  
Inversora Cordillera S.A. [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Description of acquired shares       On January 21, 2021, Transporte Aéreos del Mercosur S.A. puchased 2,392,166 preferred shares of Inversora Cordillera S.A. consequently, the shareholding composition of Inversora Cordillera S.A. is as follows: Lan Pax Group S.A. with 90.5% and Transporte Aéreos del Mercosur S.A. with 9.5%.        
Lan Argentina S.A. [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Description of acquired shares       On January 21, 2021, Transporte Aéreos del Mercosur S.A. purchased 53,376 preferred shares of Lan Argentina S.A. consequently, the shareholding composition of Lan Argentina S.A. is as follows: Inversora Cordillera S.A. with 95%, Lan Pax Group S.A. with 4% and Transporte Aéreos del Mercosur S.A. with 1%.        
Línea Aérea Carguera de Colombia S.A [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Description of acquired shares         On December 22, 2020, Línea Aérea Carguera de Colombia S.A. carries out a capital increase for 1,861,785 shares, consequently, its shareholding composition is as follows: LATAM Airlines Group S.A. with 4.57%, Fast Air S.A. with 1.53%, Inversiones Lan S.A. with 1.53%, Lan Pax Group S.A. with 1.53% and Lan Cargo Inversiones S.A. 81.31%.      
Inversiones Lan S.A. and Subsidiaries [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Number of shares acquired (in Shares) 12,312,020              
Percentage of ownership changes for capital increase 76.19%              
LATAM Airlines Group S.A. [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Percentage of ownership changes for capital increase 23.62%              
Lan Pax Group S.A [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Number of shares acquired (in Shares)     23,678          
Latam Ecuador S.A [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Number of shares acquired (in Shares)   30,000,000            
Tam Linhas Aereas S.A [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Description of acquired shares           On March 23, 2020, Transporte Aéreo S.A. carries out a capital increase for 109,662 shares which were acquired by Mas Investment Limited, consequently, the shareholding of Transporte Aéreo S.A. is as follows: Lan Cargo S.A. with 87.12567%, Inversiones Lan S.A. with 0.00012% and Mas Investment Limited with 12.87421%.    
Holdco I S.A [Member] | TAM S.A. and Subsidiaries [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Percentage of economic rights             99.9983%  
Holdco I S.A [Member] | TAM S.A. and Subsidiaries [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Percentage of rights politicians product             51.04%  
Percentage of foreign capital               100.00%
Administrative Staff [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Number of employees             4,372  
Maintenance Staff [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Number of employees             14,784  
Operations Staff [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Number of employees             6,708  
Cabin Crew [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Number of employees             3,250  
Ordinary Shares [Member]                
GENERAL INFORMATION (Details) [Line Items]                
Number of statutory capital shares (in Shares)             606,407,693  
Number of shares pending of subscription and payment (in Shares)             466,382