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EQUITY - Additional information (Details) |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 27, 2020 PEN (S/) | Feb. 27, 2019 PEN (S/) | Feb. 28, 2018 PEN (S/) | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2020 PEN (S/) shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2019 PEN (S/) shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2018 PEN (S/) shares | Dec. 31, 2020 PEN (S/) shares | Dec. 31, 2019 PEN (S/) shares | Sep. 25, 2019 PEN (S/) | Dec. 31, 2018 PEN (S/) shares
Disclosure of equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | shares |  |  |  |  |  |  |  |  |  | 94,382,317 | 94,382,317 |  | 94,382,317
Par value per share | $ / shares |  |  |  | $ 5 |  | $ 5 |  | $ 5 |  |  |  |  |
Purchase of treasury shares |  |  |  |  | S/ 151,900,000 |  | S/ 103,200,000 |  | S/ 95,400,000 |  |  |  |
Description of significant restrictions on entity's statutory reserve |  |  |  | required to keep a reserve that equals a percentage of paid-in capital (20, 30 or 50 percent, depending on its activities and the country in which production takes place); this reserve must be constituted with annual transfers of not less than 10 percent of net profits | required to keep a reserve that equals a percentage of paid-in capital (20, 30 or 50 percent, depending on its activities and the country in which production takes place); this reserve must be constituted with annual transfers of not less than 10 percent of net profits |  |  |  |  |  |  |  |
Statutory reserve |  |  |  |  |  |  |  |  |  | S/ 6,990,100,000 | S/ 6,236,500,000 |  | S/ 5,179,000,000
Increase (decrease) through transfer to statutory reserve, equity | S/ 1,977,100,000 | S/ 1,858,800,000 | S/ 2,933,600,000 |  |  |  |  |  |  |  |  |  |
Withholding tax rate |  |  |  | 5.00% | 5.00% | 5.00% | 5.00% | 5.00% | 5.00% |  |  |  |
Capital commitments |  |  |  |  |  |  |  |  |  | S/ 28,969,300,000 | S/ 25,732,000,000.00000 |  |
Increase of capital requirement |  |  |  |  | S/ 7,973,900,000 |  | S/ 4,151,600,000 |  |  |  |  |  |
Interim dividend payable |  |  |  |  |  |  |  |  |  |  |  | S/ 638,100,000 |
Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of number of treasury shares | shares |  |  |  | 240,151 | 240,151 | 129,807 | 129,807 | 133,750 | 133,750 |  |  |  |
Purchase of treasury shares | $ |  |  |  | $ 44,400,000 |  | $ 31,000,000 |  | $ 29,300,000.00000 |  |  |  |  |

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