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28. OPERATING COSTS AND EXPENSES (Details 5) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Operating Costs And Expenses [line items]      
Leasing and rentals R$ 11   R$ 93
Advertising 7   19
Own consumption of energy 24   27
Subsidies and donations 22   22
Onerous concession 3   3
Insurance 25   7
CCEE annual charge 6   6
Net loss (gain) on deactivation and disposal of assets 81   7
Forluz - Administrative running cost 30   28
Collection agents 86   78
Obligations deriving from investment contracts [1] 9  
Taxes and charges 7   9
Other expenses [2] (14)   106
Other operating expenses (revenues), net R$ 297   R$ 405
Restated [member]      
Disclosure Of Operating Costs And Expenses [line items]      
Leasing and rentals   R$ 20  
Advertising   9  
Own consumption of energy   21  
Subsidies and donations   40  
Onerous concession   3  
Insurance   12  
CCEE annual charge   6  
Net loss (gain) on deactivation and disposal of assets   88  
Forluz - Administrative running cost   30  
Collection agents   88  
Obligations deriving from investment contracts [1]   32  
Taxes and charges   10  
Other expenses [2]   135  
Other operating expenses (revenues), net   R$ 494  
[1] This refers to claims under the agreement made between Alianca Geracao, Vale S.A. and Cemig. The action is provisioned at the cost of R$119 (R$98 on December 31, 2019), of which Cemig is responsible for R$41 (R$32 on December 31, 2019).
[2] Includes the impairment loss recognized for intangible asset relating to the authorization for wind power generation granted to Volta do Rio in the amount of R$22.