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Schedule of other operating expenses (revenues), net (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Costs And Expenses      
Leasing and rentals R$ 6 R$ 11 R$ 20
Advertising 12 7 9
Own consumption of energy 28 24 21
Subsidies and donations 27 22 40
Onerous concession 3 3 3
Insurance 29 25 12
CCEE annual charge 6 6 6
Net loss (gain) on deactivation and disposal of assets (97) (81) (88)
Forluz – Administrative running cost 32 30 30
Collection agents 85 86 88
Obligations deriving from investment contracts [1] 11 9 32
Taxes and charges 16 7 10
Losses (gains) on investments [2] 40 (13)
Other revenues (expenses) 2 (1) 135
 Other operating expenses (revenues), net R$ (394) R$ (297) R$ (494)
[1] This refers to claims under the agreement made between Aliança Geração, Vale S.A. and Cemig. The action is provisioned at the cost of R$149 (R$119 on December 31, 2020), of which Cemig is responsible for R$52 (R$41 on December 31, 2020).
[2] The Company injected capital into UHE Itaocara S.A., to assist in compliance with the final Arbitration Ruling against the investee, given by the FGV in its Mediation and Arbitration Chamber, in the amount of R$40. This amount is proportional to its shareholding interest in the investee, and was recognized under Other expenses in the Company’s income statement.