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34 Provisions (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Summary of provisions [line items]    
Provisions, beginning $ 2,808  
Provisions, ending 2,431 $ 2,808
Non-current liabilities [member]    
Summary of provisions [line items]    
Provisions, beginning 2,808 2,240
Increases 1,107 1,687
Decreases (105) (28)
Recovery (587)
Result from exposure to inflation for the year (792) (1,091)
Provisions, ending 2,431 2,808
Current liabilities [member]    
Summary of provisions [line items]    
Provisions, beginning 291 392
Increases 163 174
Decreases (12) (105)
Recovery  
Result from exposure to inflation for the year (84) (170)
Provisions, ending $ 358 $ 291