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10 Expenses by nature (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of expenses by nature [line items]      
Transmission and distribution expenses $ 19,866 $ 21,980 $ 22,842
Selling expenses 10,843 10,007 10,534
Administrative expenses 5,353 5,223 6,012
Expenses by nature 36,062 37,210 39,388
Salaries and social security taxes [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses 7,756 8,666 9,066
Selling expenses 1,287 1,424 1,627
Administrative expenses 2,272 1,819 1,914
Expenses by nature 11,315 11,909 12,607
Pension plans [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses 327 260 169
Selling expenses 54 43 30
Administrative expenses 96 54 36
Expenses by nature 477 357 235
Communications expenses [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses 218 113 170
Selling expenses 444 504 564
Administrative expenses 23 34
Expenses by nature 662 640 768
Allowance for the impairment of trade and other receivables [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses
Selling expenses 4,183 1,844 2,046
Administrative expenses
Expenses by nature 4,183 1,844 2,046
Supplies consumption [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses 1,878 2,200 1,654
Selling expenses
Administrative expenses 148 156 257
Expenses by nature 2,026 2,356 1,911
Leases and insurance [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses 1 1
Selling expenses 1
Administrative expenses 315 308 377
Expenses by nature 317 308 378
Security service [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses 306 323 286
Selling expenses 32 58 4
Administrative expenses 35 126 269
Expenses by nature 373 507 559
Fees and remuneration for services [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses 3,900 3,481 2,956
Selling expenses 2,169 2,203 2,177
Administrative expenses 1,534 1,856 2,108
Expenses by nature 7,603 7,540 7,241
Public relations and marketing [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses
Selling expenses 19 56
Administrative expenses 67
Expenses by nature 19 56 67
Advertising and sponsorship [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses
Selling expenses 10 29
Administrative expenses 35
Expenses by nature 10 29 35
Reimbursements to personnel [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses
Selling expenses
Administrative expenses 1 1 1
Expenses by nature 1 1 1
Depreciation of property, plants and equipments [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses 5,118 4,952 4,217
Selling expenses 762 738 629
Administrative expenses 626 605 516
Expenses by nature 6,506 6,295 5,362
Depreciation of right-of-use asset [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses 32 22  
Selling expenses 64 45  
Administrative expenses 225 156  
Expenses by nature 321 223  
Directors and Supervisory Committee members' fees [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses
Selling expenses
Administrative expenses 28 30 46
Expenses by nature 28 30 46
ENRE penalties [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses 330 1,963 4,321
Selling expenses 365 1,806 2,202
Administrative expenses
Expenses by nature 695 3,769 6,523
Taxes and charges [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses
Selling expenses 1,453 1,257 1,254
Administrative expenses 64 68 340
Expenses by nature 1,517 1,325 1,594
Other [member]      
Summary of expenses by nature [line items]      
Transmission and distribution expenses 2
Selling expenses 1
Administrative expenses 9 21 12
Expenses by nature $ 9 $ 21 $ 15