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31 Benefit plans (Details 1) - ARS ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Benefit Plans      
Benefit payment obligations at beginning of year $ 783 $ 874  
Current service cost 161 150 $ 69
Interest cost 316 207 166
Actuarial losses (108) 10 12
Result from exposure to inflation for the year (305) (397)  
Benefits paid to participating employees (14) (61)  
Benefit payment obligations at end of year $ 833 $ 783 $ 874