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29 Borrowings (Details 4) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
USD    
Disclosure of detailed information about borrowings [line items]    
Deb structure, beginning $ 11,159
Deb structure, ending $ 8,261 $ 11,159
Class 9 [member] | Fixed rate par note [member]    
Disclosure of detailed information about borrowings [line items]    
Rate 9.75% 9.75%
Year of maturity 2022 2022
Class 9 [member] | Fixed rate par note [member] | USD    
Disclosure of detailed information about borrowings [line items]    
Deb structure, beginning $ 137 $ 166
Debt repurchase (39) (29)
Deb structure, ending $ 98 $ 137