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Other operating revenues (Details) - Products [Member] - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Charged service R$ 17 R$ 11 R$ 17
Services rendered 53 139 183
Subsidies [1] 1,592 1,395 1,266
Rental and leasing 211 164 189
Reimbursement for decontracted supply [2] 27 65
Other 35 1
 Total R$ 1,935 R$ 1,709 R$ 1,721
[1] Includes the revenue recognized for the tariff subsidies applied to users of the distribution system, in the amount of R$986 in 2021 (R$1,035 in 2020). Includes the subsidies for sources that are subject to incentive, rural, irrigators, public services and the generation sources that are subject to the incentive; and also includes the tariff flag revenue in the amount of R$108 in 2021, recognized because of the creditor position assumed by the Company in CCRBT; and revenue recognized arising from subsidies, in the amount of R$205, relating to the Program to Encourage Voluntary Reduction of Energy Consumption.
[2] Reimbursement for suspension of energy supply –Renova.