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Commitments and contingencies - Income tax declaration for 2014 (Details) | Dec. 31, 2020 PEN (S/) | Dec. 31, 2020 USD ($) | Dec. 31, 2018 PEN (S/) | Dec. 31, 2018 USD ($)
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Disclosure of Commitments and contingencies [Line Items] |  |  |  |
Declared tax deductions not recognized |  | $ 1,100,000,000 |  |
Contingent liability | S/ 43,462,000 | $ 11,993,000 |  |
SUNAT | Tax year 2014 [Member] | Open tax procedure |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |
Declared tax deductions not recognized |  |  | S/ 94,898,000 | $ 26,186,000

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