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GOODWILL (Details 1) - Goodwill [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
$ / shares
Air Transport CGU [Member]  
Disclosure of detailed information about intangible assets [line items]  
Annual growth rate (Terminal) 1.00%
Discount rate based on the weighted average cost of capital (WACC) 8.55%
Air Transport CGU [Member] | Bottom of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Annual growth rate (Terminal) 1.00%
Exchange rate (in dollars per share) 3.3 [1]
Discount rate based on the weighted average cost of capital (WACC) 7.55%
Fuel Price from futures price curves commodities markets (in dollars per Barril) | $ $ 73
Air Transport CGU [Member] | Top of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Annual growth rate (Terminal) 2.00%
Exchange rate (in dollars per share) 3.9 [1]
Discount rate based on the weighted average cost of capital (WACC) 8.55%
Fuel Price from futures price curves commodities markets (in dollars per Barril) | $ $ 78
Coalition and Loyalty Program Multiplus CGU [Member]  
Disclosure of detailed information about intangible assets [line items]  
Annual growth rate (Terminal) 4.00%
Discount rate based on cost of equity (Ke) 13.40%
Coalition and Loyalty Program Multiplus CGU [Member] | Bottom of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Annual growth rate (Terminal) 4.00% [2]
Exchange rate (in dollars per share) 3.3 [1],[2]
Discount rate based on cost of equity (Ke) 12.40% [2]
Coalition and Loyalty Program Multiplus CGU [Member] | Top of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Annual growth rate (Terminal) 5.00% [2]
Exchange rate (in dollars per share) 3.9 [1],[2]
Discount rate based on cost of equity (Ke) 13.40% [2]
[1] In line with the expectations of the Central Bank of Brazil.
[2] The flow, as well as annual growth rte and discount, are denominated in real.