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TAX SITUATION - Additional Information (Details) S/ in Millions, $ in Millions | 12 Months Ended
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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 |  |  |

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