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28 Deferred revenue (Details) - ARS ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Summary of deferred revenue [line items] |  |
Non-current | $ 1,471 | $ 368
Current | 37 | 7
Nonrefundable customer contributions [member] |  |
Summary of deferred revenue [line items] |  |
Non-current | 1,471 | 368
Current | $ 37 | $ 7

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