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CONCESSION FINANCIAL AND SECTOR ASSETS AND LIABILITIES (Details 3) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Beginning Balance R$ 2,792 R$ 2,550 R$ 2,468
Interest 467 523 347
Amounts received (309) (281) (265)
Ending Balance 2,950 2,792 2,550
Cemig Geracao Tres Marias S A [Member]      
IfrsStatementLineItems [Line Items]      
Beginning Balance 1,584 1,447 1,402
Interest 254 287 188
Amounts received (166) (150) (143)
Ending Balance 1,672 1,584 1,447
Cemig geracao salto grande sa [member]      
IfrsStatementLineItems [Line Items]      
Beginning Balance 497 454 440
Interest 80 90 59
Amounts received (52) (47) (45)
Ending Balance 525 497 454
Cemig Geracao Itutinga S A [Member]      
IfrsStatementLineItems [Line Items]      
Beginning Balance 187 171 165
Interest 33 37 25
Amounts received (22) (21) (19)
Ending Balance 198 187 171
Cemig Geracao Camargos S A [Member]      
IfrsStatementLineItems [Line Items]      
Beginning Balance 140 128 124
Interest 25 27 18
Amounts received (17) (15) (14)
Ending Balance 148 140 128
Cemig Geracao Sul S A [Member]      
IfrsStatementLineItems [Line Items]      
Beginning Balance 184 167 161
Interest 34 38 26
Amounts received (23) (21) (20)
Ending Balance 195 184 167
Cemig Geracao Leste S A [Member]      
IfrsStatementLineItems [Line Items]      
Beginning Balance 125 114 110
Interest 26 27 19
Amounts received (18) (16) (15)
Ending Balance 133 125 114
Cemig Geracao Oeste S A [Member]      
IfrsStatementLineItems [Line Items]      
Beginning Balance 75 69 66
Interest 15 17 12
Amounts received (11) (11) (9)
Ending Balance R$ 79 R$ 75 R$ 69