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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
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Dec. 31, 2020 | Dec. 31, 2019
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
Mortality technical rate in soles used in estimation of insurance reserves |  | 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 | 1.70% | 2.41%
Mortality technical rate in Nominal dollars used in estimation of insurance reserves | 3.68% | 4.26%
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%
Mortality technical rate in soles vac used in estimation of insurance reserves | 1.70% | 3.00%
Mortality technical rate in Nominal dollars used in estimation of insurance reserves | 3.68% | 4.26%
Mortality technical rate in adjusted soles used in estimation of insurance reserves | 5.25% | 5.67%
Mortality technical rate in adjusted dollars used in estimation of insurance reserves | 3.68% | 4.26%
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%
Mortality technical rate in soles vac used in estimation of insurance reserves | 3.672% | 3.771%
Pension insurance - SCTR (Longevity) |  |
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
Mortality technical rate in soles vac used in estimation of insurance reserves |  | 3.771%
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
Minimum | 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 | 2.734% | (2.83%)
Minimum | 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%
Minimum | Annuity [Member] |  |
Disclosure of insurance claim reserves and technical reserves [Line Items] |  |
Mortality technical rate in us dollars used in estimation of insurance reserves | 3.21% | 3.81%
Mortality technical rate in soles used in estimation of insurance reserves | 2.50% | 2.50%
Maximum | 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 | 3.648% | 3.816%
Maximum | 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%
Maximum | Annuity [Member] |  |
Disclosure of insurance claim reserves and technical reserves [Line Items] |  |
Mortality technical rate in us dollars used in estimation of insurance reserves | 7.96% | 7.99%
Mortality technical rate in soles used in estimation of insurance reserves | 5.25% | 5.25%

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