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TECHNICAL RESERVES FOR INSURANCE CLAIMS AND PREMIUMS - Summary of detailed information about assumptions used in estimation of insurance reserves (Details)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension insurance - Temporary Regime / SCTR [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Explanation of process used to determine assumptions to measure recognised assets, liabilities, income and expense arising from insurance contracts B-85 and MI-85 B-85 and MI-85
Mortality technical rate in soles used in estimation of insurance reserves 3.00% 3.00%
Pension insurance - Definitive Regime [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Explanation of process used to determine assumptions to measure recognised assets, liabilities, income and expense arising from insurance contracts B-85 and MI-85 B-85 and MI-85
Mortality technical rate in soles vac used in estimation of insurance reserves 2.41% 2.96%
Mortality technical rate in Nominal dollars used in estimation of insurance reserves 4.26% 4.40%
Pension insurance - Definitive Regime / SCTR [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Explanation of process used to determine assumptions to measure recognised assets, liabilities, income and expense arising from insurance contracts B-85 adjusted and MI-85 B-85 adjusted and MI-85
Mortality technical rate in us dollars used in estimation of insurance reserves 2.41% 3.00%
Mortality technical rate in soles vac used in estimation of insurance reserves 3.00% 2.96%
Mortality technical rate in Nominal dollars used in estimation of insurance reserves 4.26% 4.40%
Mortality technical rate in adjusted soles used in estimation of insurance reserves 5.67% 5.82%
Mortality technical rate in adjusted dollars used in estimation of insurance reserves 4.26% 4.40%
Pension insurance - Temporary Regime / SCTR (Longevity) [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Explanation of process used to determine assumptions to measure recognised assets, liabilities, income and expense arising from insurance contracts SPP-S-2017- and SPP-I-2017 SPP-S-2017- and SPP-I-2017
Mortality technical rate in us dollars used in estimation of insurance reserves 0.94% 3.791%
Mortality technical rate in soles vac used in estimation of insurance reserves 3.771% 3.915%
Individual life [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Explanation of process used to determine assumptions to measure recognised assets, liabilities, income and expense arising from insurance contracts CSO 80 adjusted CSO 80 adjusted
Annuity [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Explanation of process used to determine assumptions to measure recognised assets, liabilities, income and expense arising from insurance contracts SPP-S-2017 and SPP-I- 2017 SPP-S-2017 and SPP-I- 2017
Bottom of range [member] | Pension insurance - Temporary Regime / SCTR (Longevity) [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Mortality technical rate in soles vac used in estimation of insurance reserves (2.83%)  
Bottom of range [member] | Individual life [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Mortality technical rate in us dollars used in estimation of insurance reserves 4.00% 4.00%
Bottom of range [member] | Annuity [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Mortality technical rate in us dollars used in estimation of insurance reserves 3.81% 3.81%
Mortality technical rate in soles used in estimation of insurance reserves 2.50% 2.50%
Top of range [member] | Pension insurance - Temporary Regime / SCTR (Longevity) [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Mortality technical rate in soles vac used in estimation of insurance reserves 3.816%  
Top of range [member] | Individual life [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Mortality technical rate in us dollars used in estimation of insurance reserves 5.00% 5.00%
Top of range [member] | Annuity [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Mortality technical rate in us dollars used in estimation of insurance reserves 7.99% 7.99%
Mortality technical rate in soles used in estimation of insurance reserves 5.25% 5.25%