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26 Trade payables (Details) - ARS ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Summary of trade payables [line items]    
Total Non-current $ 521 $ 503
Total Current 33,019 17,288
Customer guarantees [member]    
Summary of trade payables [line items]    
Total Non-current 274 290
Customer contributions [member]    
Summary of trade payables [line items]    
Total Non-current 247 213
Total Current 32 42
Payables for purchase of electricity - CAMMESA [member]    
Summary of trade payables [line items]    
Total Current 21,384 5,945
Provision for unbilled electricity purchases - CAMMESA [member]    
Summary of trade payables [line items]    
Total Current 6,644 6,722
Suppliers [member]    
Summary of trade payables [line items]    
Total Current 4,560 4,140
Advance to customer [member]    
Summary of trade payables [line items]    
Total Current 362 388
Discounts to customers [member]    
Summary of trade payables [line items]    
Total Current $ 37 $ 51