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TAX SITUATION - Additional Information (Details)
S/ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
PEN (S/)
Dec. 31, 2018
PEN (S/)
Dec. 31, 2017
PEN (S/)
Disclosure of tax situation [Line Items]        
Applicable Tax Rate 29.50% 29.50% 29.50% 29.50%
Percentage of workers profit sharing 5.00% 5.00%    
Average effective tax rate 27.14% 27.14% 27.20% 24.99%
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | S/   S/ 26.6 S/ 5.3 S/ 32.1
Partially integrated system [Member]        
Disclosure of tax situation [Line Items]        
Applicable Tax Rate 27.00% 27.00% 27.00%  
Peru [Member]        
Disclosure of tax situation [Line Items]        
Applicable Tax Rate 29.50% 29.50% 29.50%  
Bolivia [Member]        
Disclosure of tax situation [Line Items]        
Applicable Tax Rate 25.00% 25.00% 25.00%  
Change in percentage of ROE 6.00% 6.00%    
Tax rate effect from change in tax rate (25.00%) (25.00%)    
Average effective tax rate 50.00% 50.00%    
Chile [Member] | Top of range [member]        
Disclosure of tax situation [Line Items]        
Tax rate effect from change in tax rate 4.00% 4.00%    
Chile [Member] | Bottom of range [member]        
Disclosure of tax situation [Line Items]        
Tax rate effect from change in tax rate 35.00% 35.00%    
Colombia [Member]        
Disclosure of tax situation [Line Items]        
Applicable Tax Rate 33.00% 33.00% 33.00%  
Surcharge Rate     4.00%  
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss | $ $ 800.0