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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, 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%

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- Definition The explanation of the process used to determine assumptions that have the greatest effect on the measurement of recognised assets, liabilities, income and expense arising from insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 4 -IssueDate 2019-01-01 -Paragraph 37 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2019-en-b&anchor=para_37_c&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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