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CONCESSION FINANCIAL AND SECTOR ASSETS AND LIABILITIES (Details 2)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
BRL (R$)
MW
IfrsStatementLineItems [Line Items]  
Installed capacity (MW) | MW 3,601
Net balance of assets based on historical cost R$ 219
Net balance of assets based on fair value 644
Financial Update 44
Net balance of assets R$ 691
Usina hidreletrica tress marias [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 396.00
Net balance of assets based on historical cost R$ 71
Net balance of assets based on fair value 167
Financial Update 12
Net balance of assets R$ 179
Usina hidreletrica salto grande [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 102.00
Net balance of assets based on historical cost R$ 12
Net balance of assets based on fair value 86
Financial Update 6
Net balance of assets R$ 92
Usina hidreletrica itutinga [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 52.00
Net balance of assets based on historical cost R$ 4
Net balance of assets based on fair value 10
Financial Update 1
Net balance of assets R$ 11
Usina hidreletrica camargos [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 46.00
Net balance of assets based on historical cost R$ 7
Net balance of assets based on fair value 20
Financial Update 1
Net balance of assets R$ 21
Cemig PCH piau [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 18.01
Net balance of assets based on historical cost R$ 2
Net balance of assets based on fair value 4
Net balance of assets R$ 5
Cemig PCH gafanhoto [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 14.00
Net balance of assets based on historical cost R$ 1
Net balance of assets based on fair value 5
Net balance of assets R$ 6
Cemig PCH peti [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 9.40
Net balance of assets based on historical cost R$ 1
Net balance of assets based on fair value 6
Net balance of assets R$ 6
Cemig PCH dona rita [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date Sep. 2013
Installed capacity (MW) | MW 2.41
Net balance of assets based on historical cost R$ 1
Net balance of assets based on fair value 2
Net balance of assets R$ 2
Cemig PCH tronqueiras [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 8.50
Net balance of assets based on historical cost R$ 2
Net balance of assets based on fair value 9
Financial Update 1
Net balance of assets R$ 9
Cemig PCH joasal [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 8.40
Net balance of assets based on historical cost R$ 2
Net balance of assets based on fair value 6
Net balance of assets R$ 7
Cemig PCH martins [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 7.70
Net balance of assets based on historical cost R$ 2
Net balance of assets based on fair value 4
Net balance of assets R$ 5
Cemig PCH cajuru [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 7.20
Net balance of assets based on historical cost R$ 4
Net balance of assets based on fair value 19
Financial Update 1
Net balance of assets R$ 20
Cemig PCH paciencia [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 4.08
Net balance of assets based on historical cost R$ 1
Net balance of assets based on fair value 4
Net balance of assets R$ 4
Cemig PCH marmelos [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date July 2015
Installed capacity (MW) | MW 4.00
Net balance of assets based on historical cost R$ 1
Net balance of assets based on fair value 2
Net balance of assets R$ 3
Usina hidreletrica volta grande [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date Feb. 2017
Installed capacity (MW) | MW 380.00
Usina hidreletrica miranda [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date Dec. 2016
Installed capacity (MW) | MW 408.00
Net balance of assets based on historical cost R$ 35
Net balance of assets based on fair value 91
Financial Update 7
Net balance of assets R$ 97
Usina hidreletrica jaguara [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date Aug. 2013
Installed capacity (MW) | MW 424.00
Net balance of assets based on historical cost R$ 46
Net balance of assets based on fair value 138
Financial Update 10
Net balance of assets R$ 148
Usina hidreletrica sao simao [member]  
IfrsStatementLineItems [Line Items]  
Concession expiration date Jan. 2015
Installed capacity (MW) | MW 1,710
Net balance of assets based on historical cost R$ 27
Net balance of assets based on fair value 71
Financial Update 5
Net balance of assets R$ 77