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TAX SITUATION (Details Textual) - PEN (S/) S/ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of tax situation [Line Items] |  |  |  |  |
Applicable tax rate |  |  | 29.50% | 28.00% | 28.00%
Percentage of workers profit sharing |  |  | 5.00% |  |
Tax rate effect from change in tax rate |  |  | 0.00% | (0.53%) | 0.00%
Average effective tax rate |  |  | 24.99% | 26.20% | 27.46%
Income tax relating to components of other comprehensive income that will be reclassified to profit or loss |  |  | S/ 33.8 | S/ 42.0 | S/ 30.9
Peru [Member] |  |  |  |  |
Disclosure of tax situation [Line Items] |  |  |  |  |
Applicable tax rate |  |  | 29.50% | 28.00% |
Bolivia [Member] |  |  |  |  |
Disclosure of tax situation [Line Items] |  |  |  |  |
Applicable tax rate |  |  | 25.00% |  |
Change in percentage of ROE |  |  | 6.00% |  |
Tax rate effect from change in tax rate |  |  | 22.00% |  |
Average effective tax rate |  |  | 47.00% |  |
Chile [Member] |  |  |  |  |
Disclosure of tax situation [Line Items] |  |  |  |  |
Applicable tax rate |  |  | 25.00% |  |
Tax rate effect from change in tax rate |  |  | 35.00% |  |
Chile [Member] | Partially integrated system [Member] |  |  |  |  |
Disclosure of tax situation [Line Items] |  |  |  |  |
Applicable tax rate |  |  | 25.50% |  |
Chile [Member] | Subsequent Events [Member] | Partially integrated system [Member] |  |  |  |  |
Disclosure of tax situation [Line Items] |  |  |  |  |
Applicable tax rate |  | 27.00% |  |  |
Colombia [Member] |  |  |  |  |
Disclosure of tax situation [Line Items] |  |  |  |  |
Applicable tax rate |  |  | 34.00% | 25.00% |
Surcharge Rate |  |  |  | 6.00% |
Colombia [Member] | Subsequent Events [Member] |  |  |  |  |
Disclosure of tax situation [Line Items] |  |  |  |  |
Applicable tax rate | 33.00% | 33.00% |  |  |
Surcharge Rate |  | 4.00% |  |  |

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