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5 Financial risk management (Details 2) - ARS ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Summary of financial risk management [line items] |  |
Decrease in the results of operations for the year | $ (819) | $ (1,091)
US dollar |  |
Summary of financial risk management [line items] |  |
Decrease in the results of operations for the year | (819) | (1,085)
Euro |  |
Summary of financial risk management [line items] |  |
Decrease in the results of operations for the year |  | (4)
Swiss franc (CHF) |  |
Summary of financial risk management [line items] |  |
Decrease in the results of operations for the year |  | $ (2)

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