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TAX SITUATION - Reconciliation of the Statutory Income Tax Rate to the Effective Tax Rate (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
TAX SITUATION      
Peruvian statutory income tax rate 29.50% 29.50% 29.50%
Increase (decrease) in the statutory tax rate due to:      
(i) Increase arising from income of subsidiaries not domiciled in Peru 1.55% 0.09% 0.47%
(ii) Non-taxable income, net (3.91%) (2.39%) (4.98%)
Effective income tax rate 27.14% 27.20% 24.99%