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Concession Financial and Sector Assets and Liabilities - Schedule of Generation Indemnity Receivable (Details)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
BRL (R$)
MW
IfrsStatementLineItems [Line Items]  
Installed capacity (MW) | MW 3,601.7
Net balance of assets R$ 785
Financial Update 86
Net balance of assets R$ 871
Usina hidreletrica tress marias [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 396
Net balance of assets R$ 203
Financial Update 22
Net balance of assets R$ 225
Usina hidreletrica salto grande [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 102
Net balance of assets R$ 104
Financial Update 11
Net balance of assets R$ 115
Usina hidreletrica itutinga [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 52
Net balance of assets R$ 12
Financial Update 1
Net balance of assets R$ 13
Usina hidreletrica camargos [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 46
Net balance of assets R$ 24
Financial Update 2
Net balance of assets R$ 26
Cemig PCH piau [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 18.01
Net balance of assets R$ 6
Financial Update 1
Net balance of assets R$ 7
Cemig PCH gafanhoto [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 14
Net balance of assets R$ 7
Financial Update 1
Net balance of assets R$ 8
Cemig PCH peti [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 9.4
Net balance of assets R$ 7
Financial Update 1
Net balance of assets R$ 8
Cemig PCH dona rita [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date Sep. 2013
Installed capacity (MW) | MW 2.41
Net balance of assets R$ 2
Financial Update 0
Net balance of assets R$ 2
Cemig PCH tronqueiras [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 8.5
Net balance of assets R$ 10
Financial Update 1
Net balance of assets R$ 11
Cemig PCH joasal [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 8.4
Net balance of assets R$ 8
Financial Update 1
Net balance of assets R$ 9
Cemig PCH martins [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 7.7
Net balance of assets R$ 6
Financial Update 1
Net balance of assets R$ 7
Cemig PCH cajuru [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 7.2
Net balance of assets R$ 23
Financial Update 3
Net balance of assets R$ 26
Cemig PCH paciencia [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 4.08
Net balance of assets R$ 5
Financial Update 0
Net balance of assets R$ 5
Cemig PCH marmelos [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 4
Net balance of assets R$ 3
Financial Update 0
Net balance of assets R$ 3
Usina hidreletrica volta grande [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date Feb. 2017
Installed capacity (MW) | MW 380
Net balance of assets R$ 0
Financial Update 0
Net balance of assets R$ 0
Usina hidreletrica miranda [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date Dec. 2016
Installed capacity (MW) | MW 408
Net balance of assets R$ 110
Financial Update 12
Net balance of assets R$ 122
Usina hidreletrica jaguara [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date Aug. 2013
Installed capacity (MW) | MW 424
Net balance of assets R$ 168
Financial Update 19
Net balance of assets R$ 187
Usina hidreletrica sao simao [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date Jan. 2015
Installed capacity (MW) | MW 1,710
Net balance of assets R$ 87
Financial Update 10
Net balance of assets R$ 97