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Schedule of operating costs and expenses (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Costs And Expenses      
Personnel (a) R$ 1,240 R$ 1,276 R$ 1,272
Employees’ and managers’ profit sharing 134 142 263
Post-employment benefits (reversals) – Note 24 [1] (16) (438) (408)
Materials 94 79 91
Outsourced services (b) 1,450 1,265 1,239
Energy purchased for resale (c) 16,101 12,111 11,286
Depreciation and amortization [2] 1,049 989 958
Operating provisions  and adjustments for operating losses (d) 375 423 2,401
Charges for use of the national grid 3,337 1,748 1,426
Gas bought for resale 2,011 1,083 1,436
Construction costs (e) 2,036 1,581 1,200
Other operating expenses, net (f) (394) (297) (494)
 Operating costs and expenses R$ 28,237 R$ 21,432 R$ 22,474
[1] Due to the changes made in the Collective Work Agreement for 2021–23, for offer and payment of life insurance for the employees and former employees, the Company believes that the post-retirement benefit in question had been canceled, in its entirety, and as a result wrote down the balance of the obligation. More information, see Note 24.
[2] Net of PIS/Pasep and Cofins taxes applicable to amortization of the right-of-use assets in the amount of R$2.