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32 Income tax and deferred tax (Details 1) - ARS ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of income tax deferred tax [line items]        
Deferred tax asset $ 3,444 $ 2,815 $ 6,105  
Deferred tax liability (27,153) (30,115) (22,952)  
Net deferred tax liability (23,709) (27,300) (16,847) $ (15,260)
To be recovered in more than 12 months [member]        
Summary of income tax deferred tax [line items]        
Deferred tax asset 3,444 2,815 6,105  
Deferred tax liability $ (27,153) $ (30,115) $ (22,952)