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23 Share capital and additional paid-in capital (Details) - ARS ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of share capital and additional paid in capital [line items]    
Share capital and additional paid-in capital balance $ 38,596 $ 38,596
Share Capital [member]    
Disclosure of share capital and additional paid in capital [line items]    
Share capital and additional paid-in capital balance 38,092 38,092
Additional Paid-in Capital [member]    
Disclosure of share capital and additional paid in capital [line items]    
Share capital and additional paid-in capital balance $ 504 $ 504