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INTANGIBLE ASSETS (Details 3)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
BRL (R$)
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 1,033
Cemig Geracao Camargos [Member]  
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 9
End of concession Jan. 05, 2046
Extension in years 7 years
New end of concession Jan. 03, 2053
Cemig Geracao Itutinga [Member]  
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 8
End of concession Jan. 05, 2046
Extension in years 7 years
New end of concession Jan. 03, 2053
Dona Rita [Member]  
IfrsStatementLineItems [Line Items]  
End of concession Jul. 03, 2046
Extension in years 4 years
New end of concession Jul. 19, 2050
Ervalia [Member]  
IfrsStatementLineItems [Line Items]  
End of concession Jul. 03, 2046
Extension in years 9 months 18 days
New end of concession Apr. 19, 2047
Neblina [Member]  
IfrsStatementLineItems [Line Items]  
End of concession Jul. 03, 2046
Extension in years 9 months 18 days
New end of concession Apr. 19, 2047
Peti [Member]  
IfrsStatementLineItems [Line Items]  
End of concession Jan. 05, 2046
Extension in years 7 years
New end of concession Jan. 03, 2053
Sinceridade [Member]  
IfrsStatementLineItems [Line Items]  
End of concession Jul. 03, 2046
Extension in years 8 months 12 days
New end of concession Mar. 12, 2047
Tronqueiras [Member]  
IfrsStatementLineItems [Line Items]  
End of concession Jan. 05, 2046
Extension in years 1 year
New end of concession Dec. 26, 2046
Cajuru Cemig [Member]  
IfrsStatementLineItems [Line Items]  
End of concession Jan. 05, 2046
Extension in years 7 years
New end of concession Jan. 03, 2053
Cemig Geracao Salto Grande [Member]  
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 40
End of concession Jan. 05, 2046
Extension in years 7 years
New end of concession Jan. 03, 2053
Cemig Geracao Sul [Member]  
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 2
Coronel Domiciano [Member]  
IfrsStatementLineItems [Line Items]  
End of concession Jul. 03, 2046
Extension in years 9 months 18 days
New end of concession Apr. 11, 2047
Joasal [Member]  
IfrsStatementLineItems [Line Items]  
End of concession Jan. 05, 2046
Extension in years 7 years
New end of concession Jan. 03, 2053
Marmelos [Member]  
IfrsStatementLineItems [Line Items]  
End of concession Jan. 05, 2046
Extension in years 7 years
New end of concession Jan. 03, 2053
Paciencia [Member]  
IfrsStatementLineItems [Line Items]  
End of concession Jan. 05, 2046
Extension in years 7 years
New end of concession Jan. 03, 2053
Piau [Member]  
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 1
End of concession Jan. 05, 2046
Extension in years 7 years
New end of concession Jan. 03, 2053
C E M I G Geracao Tres Marias [Member]  
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 116
End of concession Jan. 05, 2046
Extension in years 7 years
New end of concession Jan. 03, 2053
Cemig Poco Fundo [Member]  
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 1
End of concession May 29, 2045
Extension in years 7 years
New end of concession May 27, 2052
Cemig P C H Pai Joaquim [Member]  
IfrsStatementLineItems [Line Items]  
End of concession Apr. 04, 2032
Extension in years 4 months 24 days
New end of concession Sep. 14, 2032
Machado Mineiro [Member]  
IfrsStatementLineItems [Line Items]  
End of concession Jul. 08, 2025
Extension in years 1 year 10 months 24 days
New end of concession May 21, 2027
Rosal [Member]  
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 9
End of concession May 08, 2032
Extension in years 3 years 7 months 6 days
New end of concession Dec. 13, 2035
Sa Carvalho [Member]  
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 40
End of concession Dec. 01, 2024
Extension in years 1 year 8 months 12 days
New end of concession Aug. 27, 2026
Total [Member]  
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 226
Nova Ponte [Member]  
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 256
End of concession Jul. 23, 2025
Extension in years 2 years 1 month 6 days
New end of concession Aug. 11, 2027
Irape [Member]  
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 105
End of concession Feb. 28, 2035
Extension in years 2 years 7 months 6 days
New end of concession Sep. 18, 2037
Queimado [Member]  
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 19
End of concession Dec. 18, 2032
Extension in years 1 year 9 months 18 days
New end of concession Jun. 26, 2034
Sao Bernardo Cemig [Member]  
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 1
End of concession Aug. 19, 2025
Extension in years 1 year 10 months 24 days
New end of concession Jun. 27, 2027
Emborcacao [Member]  
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 426
End of concession Jul. 23, 2025
Extension in years 1 year 9 months 18 days
New end of concession May 26, 2027
Total Cemig G T [Member]  
IfrsStatementLineItems [Line Items]  
Intangible assets right to extension of concession R$ 807