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FINANCIAL RISK MANAGEMENT - Net Assets Under Administration Off the Balance Sheet (Details) - PEN (S/)
S/ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about assigned value of financial assets [Line Items]    
Assigned value of the financial assets S/ 120,768 S/ 107,643
Pension funds [Member]    
Disclosure of detailed information about assigned value of financial assets [Line Items]    
Assigned value of the financial assets 53,912 47,452
Investment funds    
Disclosure of detailed information about assigned value of financial assets [Line Items]    
Assigned value of the financial assets 43,635 40,186
Equity managed [Member]    
Disclosure of detailed information about assigned value of financial assets [Line Items]    
Assigned value of the financial assets 18,387 15,397
Bank trusts [Member]    
Disclosure of detailed information about assigned value of financial assets [Line Items]    
Assigned value of the financial assets S/ 4,834 S/ 4,608