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13 Basic and diluted earnings per share (Details) - ARS ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic and diluted (loss) profit per share:      
(Loss) Profit for the year $ (17,698) $ 16,518 $ 8,995
Weighted average number of common shares outstanding 875 875 890
Basic and diluted profit per share - in pesos [1] $ (20.23) $ 18.88 $ 10.11
[1] As of December 31, 2019, includes the result of the Agreement on the Regularization of Obligations.