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INVESTMENTS (Details 3) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Share capital R$ 11,007 R$ 8,467  
Equity R$ 21,784 R$ 19,462  
C E M I G Geracaoe Transmissao [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 2,896,785,358    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 5,474 R$ 4,124 R$ 4,000
Equity R$ 8,893 R$ 7,755 R$ 5,842
M E S A [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares [1] 24,796,536,323    
Cemig interest % [1] 7.53% 15.51% 15.51%
Share capital [1] R$ 12,202 R$ 10,620 R$ 10,620
Equity [1] R$ 229 R$ 1,492 R$ 2,259
Hidreletrica cachoeirao [member]      
IfrsStatementLineItems [Line Items]      
Number of shares 35,000,000    
Cemig interest % 49.00% 49.00% 49.00%
Share capital R$ 35 R$ 35 R$ 35
Equity R$ 96 R$ 120 R$ 110
Guanhaes Energia [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares [2] 548,626,000    
Cemig interest % [2] 49.00% 49.00% 49.00%
Share capital [2] R$ 549 R$ 549 R$ 549
Equity [2] R$ 373 R$ 255 R$ 268
Hidreletrica pipoca [member]      
IfrsStatementLineItems [Line Items]      
Number of shares 41,360,000    
Cemig interest % 49.00% 49.00% 49.00%
Share capital R$ 41 R$ 41 R$ 41
Equity R$ 95 R$ 93 R$ 73
Baguari Energia [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares [3] 26,157,300,278    
Cemig interest % [3] 69.39% 69.39% 69.39%
Share capital [3] R$ 187 R$ 187 R$ 187
Equity [3] R$ 231 R$ 243 R$ 229
Parajuru [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 85,834,843    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 86 R$ 86 R$ 71
Equity R$ 158 R$ 128 R$ 107
Voltado Rio [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 274,867,441    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 275 R$ 275 R$ 117
Equity R$ 248 R$ 207 R$ 171
Lightger [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 79,078,937    
Cemig interest % 49.00% 49.00% 49.00%
Share capital R$ 79 R$ 79 R$ 79
Equity R$ 123 R$ 98 R$ 106
Alianca norte (belo monte plant) [member]      
IfrsStatementLineItems [Line Items]      
Number of shares 41,949,320,044    
Cemig interest % 49.00% 49.00% 49.00%
Share capital R$ 1,210 R$ 1,209 R$ 1,209
Equity R$ 1,084 R$ 1,148 R$ 1,189
Amazonia Energia [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares [3],[4] 1,322,897,723    
Cemig interest % [3],[4] 74.50% 74.50% 74.50%
Share capital [3],[4] R$ 1,323 R$ 1,323 R$ 1,323
Equity [3],[4] R$ 1,189 R$ 1,252 R$ 1,296
Alianca Geracao [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 1,291,582,500    
Cemig interest % 45.00% 45.00% 45.00%
Share capital R$ 1,291 R$ 1,291 R$ 1,291
Equity R$ 2,039 R$ 1,858 R$ 1,858
Retiro Baixo [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 225,350,000    
Cemig interest % 49.90% 49.90% 49.90%
Share capital R$ 225 R$ 225 R$ 225
Equity R$ 319 R$ 346 R$ 325
Itaocara [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 156,259,500    
Cemig interest % 49.00% 49.00% 49.00%
Share capital R$ 207 R$ 156 R$ 72
Equity R$ 15 R$ (42) R$ (60)
Cemig Baguari [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 406,000    
Cemig interest % 100.00% 100.00% 100.00%
C E M I G Geracao Tres Marias [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 1,291,423,369    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 1,291 R$ 1,291 R$ 1,291
Equity R$ 1,728 R$ 1,652 R$ 1,452
Cemig Ger Salto Grande S A [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 405,267,607    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 405 R$ 405 R$ 405
Equity R$ 562 R$ 527 R$ 455
Cemig Ger Itutinga S A [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 151,309,332    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 151 R$ 151 R$ 151
Equity R$ 231 R$ 212 R$ 180
Cemig Geracao Camargos S A [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 113,499,102    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 113 R$ 113 R$ 113
Equity R$ 183 R$ 165 R$ 144
Cemig Geracao Sul S A [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 148,146,505    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 148 R$ 148 R$ 148
Equity R$ 252 R$ 215 R$ 174
Cemig Geracao Leste S A [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 100,568,929    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 101 R$ 101 R$ 101
Equity R$ 168 R$ 148 R$ 127
Cemig Geracao Oeste S A [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 60,595,484    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 61 R$ 61 R$ 61
Equity R$ 126 R$ 106 R$ 84
Rosal Energia S A [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 46,944,467    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 47 R$ 47 R$ 47
Equity R$ 123 R$ 115 R$ 127
Sa Carvalho S A [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 361,200,000    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 37 R$ 37 R$ 37
Equity R$ 138 R$ 134 R$ 115
Horizontes Energia S A [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 39,257,563    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 39 R$ 39 R$ 39
Equity R$ 61 R$ 60 R$ 55
Cemig P C H S A [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 45,952,000    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 46 R$ 46 R$ 46
Equity R$ 99 R$ 90 R$ 90
Cemig Geracao Poco Fundo S A [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 97,161,578    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 139 R$ 97 R$ 1
Equity R$ 172 R$ 144 R$ 4
Empresa De Servicos De Comercializacao De Energia Eletrica S A [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 486,000    
Cemig interest % 100.00% 100.00% 100.00%
Equity R$ 11 R$ 8 R$ 57
Cemig Trading S A [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 1,000,000    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 1 R$ 1 R$ 1
Equity R$ 6 R$ 2 R$ 30
Centroeste [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 28,000,000    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 28 R$ 28 R$ 28
Equity R$ 120 R$ 122 R$ 118
Cemig Distribuicao [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 2,359,113,452    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 5,372 R$ 5,372 R$ 5
Equity R$ 7,105 R$ 6,943 R$ 6
Taesa [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 1,033,496,721    
Cemig interest % 21.68% 21.68% 21.68%
Share capital R$ 3,042 R$ 3,042 R$ 3
Equity R$ 6,570 R$ 6,685 R$ 6
Gasmig [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 409,255,483    
Cemig interest % 99.57% 99.57% 99.57%
Share capital R$ 665 R$ 665 R$ 665
Equity R$ 1,373 R$ 1,222 R$ 1
C E M I G Sim [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 112,420,992    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 175 R$ 102 R$ 24
Equity R$ 199 R$ 111 R$ 94
Sete Lagoas [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 36,857,080    
Cemig interest % 100.00% 100.00% 100.00%
Share capital R$ 37 R$ 37  
Equity R$ 73 R$ 65  
U F V Janauba [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 18,509,900    
Cemig interest % 49.00% 49.00% 49.00%
Share capital R$ 7 R$ 7 R$ 19
Equity R$ 7 R$ 6 R$ 22
U F V Corinto [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 18,000,000    
Cemig interest % 49.00% 49.00% 49.00%
Share capital R$ 16 R$ 18 R$ 18
Equity R$ 17 R$ 19 R$ 20
U F V Manga [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 21,235,933    
Cemig interest % 49.00% 49.00% 49.00%
Share capital R$ 19 R$ 22 R$ 21
Equity R$ 21 R$ 22 R$ 24
U F V Bonfinopolis [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 13,197,187    
Cemig interest % 49.00% 49.00% 49.00%
Share capital R$ 12 R$ 13 R$ 13
Equity R$ 13 R$ 13 R$ 13
U F V Lagoa Grande [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 25,471,844    
Cemig interest % 49.00% 49.00% 49.00%
Share capital R$ 23 R$ 25 R$ 25
Equity R$ 25 R$ 26 R$ 26
U F V Lontra [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 29,010,219    
Cemig interest % 49.00% 49.00% 49.00%
Share capital R$ 27 R$ 29 R$ 29
Equity R$ 29 R$ 29 R$ 29
U F V Mato Verde [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 11,030,391    
Cemig interest % 49.00% 49.00% 49.00%
Share capital R$ 10 R$ 11 R$ 11
Equity R$ 11 R$ 11 R$ 12
U F V Mirabela [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 9,320,875    
Cemig interest % 49.00% 49.00% 49.00%
Share capital R$ 9 R$ 9 R$ 9
Equity R$ 10 R$ 9 R$ 9
U F V Porteirinha I [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 12,348,392    
Cemig interest % 49.00% 49.00% 49.00%
Share capital R$ 11 R$ 12 R$ 12
Equity R$ 11 R$ 13 R$ 13
U F V Porteirinha I I [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 11,702,733    
Cemig interest % 49.00% 49.00% 49.00%
Share capital R$ 11 R$ 12 R$ 12
Equity R$ 12 R$ 12 R$ 12
U F V Brasilandia [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 25,629,900    
Cemig interest % 49.00% 49.00%  
Share capital R$ 24 R$ 26  
Equity R$ 26 R$ 27  
U F V Prudentede Moraes [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 35,050,000    
Cemig interest % 100.00%    
Share capital R$ 35    
Equity R$ 35    
U F V Apolo I [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 8,258,980    
Cemig interest % 49.00%    
Share capital R$ 8    
Equity R$ 9    
U F V Campo Lindo I [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 13,323,845    
Cemig interest % 49.00%    
Share capital R$ 13    
Equity R$ 13    
U F V Campo Lindo I I [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 13,323,845    
Cemig interest % 49.00%    
Share capital R$ 13    
Equity R$ 14    
U F V Olaria I [Member]      
IfrsStatementLineItems [Line Items]      
Number of shares 13,323,845    
Cemig interest % 49.00%    
Share capital R$ 13    
Equity R$ 13    
[1] Indirect participation in Santo Antônio Plant through this investee.
[2] On June 23, 2022, Light concluded the sale of its equity interests in Guanhães Energia and Lightger to Brasal Energia S.A.. The operation consisted of the sale to Brasal Energia S.A. of the total interest held by Light representing 51% of the capital stock of Lightger and Guanhães Energia.
[3] Joint venture based on shareholders’ agreement.
[4] Indirect participation in Belo Monte Plant through this investee.