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12 Net finance costs (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of net financial costs [line items]      
Total financial income $ 55 $ 78 $ 176
Total finance costs (9,276) (9,205) (10,416)
Total other finance costs (1,890) (4,796) (4,114)
Total net finance costs (11,111) (13,923) (14,354)
Financial interest [member]      
Summary of net financial costs [line items]      
Total financial income 25 75 72
Other interest [member]      
Summary of net financial costs [line items]      
Total financial income 30 3 104
Commercial interest [member]      
Summary of net financial costs [line items]      
Total finance costs (5,986) (4,069) (6,191)
Interest and other [member]      
Summary of net financial costs [line items]      
Total finance costs (3,170) (5,106) (4,159)
Fiscal interest [member]      
Summary of net financial costs [line items]      
Total finance costs (109) (7) (48)
Bank fees and expenses [member]      
Summary of net financial costs [line items]      
Total finance costs (11) (23) (18)
Changes in fair value of financial assets [member]      
Summary of net financial costs [line items]      
Total other finance costs 989 383 1,563
Net gain from the repurchase of Corporate Notes [member]      
Summary of net financial costs [line items]      
Total other finance costs 415 622 10
Exchange differences [member]      
Summary of net financial costs [line items]      
Total other finance costs (2,955) (5,674) (5,506)
Adjustment to present value of receivables [member]      
Summary of net financial costs [line items]      
Total other finance costs (129) (104) (1)
Recovery of provision for credit RDSA [member]      
Summary of net financial costs [line items]      
Total other finance costs
Other finance costs [member]      
Summary of net financial costs [line items]      
Total other finance costs $ (210) $ (23) $ (180)