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Investments - Schedule of Subsidiaries and Jointly Controlled Entities Percentage by the Company's Ownership Interest (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
IfrsStatementLineItems [Line Items] |  |  |
Share capital | R$ 11,007 | R$ 11,007 |
Equity | R$ 24,656 | R$ 21,784 |
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$ 5,474 | R$ 4,124
Equity | R$ 10,703 | R$ 8,893 | R$ 7,755
M E S A [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares | 24,796,536,323 |  |
Cemig interest % |  | 7.53% | 15.51%
Share capital |  | R$ 12,202 | R$ 10,620
Equity |  | R$ 229 | R$ 1,492
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$ 96 | R$ 120
Guanhaes Energia [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares | 548,626,000 |  |
Cemig interest % | 49.00% | 49.00% | 49.00%
Share capital | R$ 549 | R$ 549 | R$ 549
Equity | R$ 419 | R$ 373 | R$ 255
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$ 97 | R$ 95 | R$ 95
Baguari Energia [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares | 26,157,300,278 |  |
Cemig interest % |  | 69.39% | 69.39%
Share capital |  | R$ 187 | R$ 187
Equity |  | R$ 231 | R$ 243
Parajuru [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares | 35,000,000 |  |
Cemig interest % | 100.00% | 100.00% | 100.00%
Share capital | R$ 35 | R$ 86 | R$ 86
Equity | R$ 92 | R$ 158 | R$ 128
Voltado Rio [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares | 180,000,000 |  |
Cemig interest % | 100.00% | 100.00% | 100.00%
Share capital | R$ 180 | R$ 275 | R$ 275
Equity | R$ 208 | R$ 248 | R$ 207
Lightger [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares | 79,078,937 |  |
Cemig interest % | 49.00% | 49.00% | 49.00%
Share capital | R$ 57 | R$ 79 | R$ 79
Equity | R$ 83 | R$ 123 | R$ 98
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$ 1,210 | R$ 1,209
Equity | R$ 1,007 | R$ 1,084 | R$ 1,148
Amazonia Energia [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares | 1,322,897,723 |  |
Cemig interest % | 74.50% | 74.50% | 74.50%
Share capital | R$ 1,323 | R$ 1,323 | R$ 1,323
Equity | R$ 1,099 | R$ 1,189 | R$ 1,252
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$ 2,046 | R$ 2,039 | R$ 1,858
Retiro Baixo [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares | 225,350,000 |  |
Cemig interest % |  | 49.90% | 49.90%
Share capital |  | R$ 225 | R$ 225
Equity |  | R$ 319 | R$ 346
Itaocara [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares | 156,259,500 |  |
Cemig interest % | 49.00% | 49.00% | 49.00%
Share capital | R$ 207 | R$ 207 | R$ 156
Equity | R$ 15 | R$ 15 | R$ (42)
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%
Share capital |  | R$ 1,291 | R$ 1,291
Equity |  | R$ 1,728 | R$ 1,652
Cemig Ger Salto Grande S A [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares | 405,267,607 |  |
Cemig interest % |  | 100.00% | 100.00%
Share capital |  | R$ 405 | R$ 405
Equity |  | R$ 562 | R$ 527
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$ 228 | R$ 231 | R$ 212
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$ 168 | R$ 183 | R$ 165
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$ 255 | R$ 252 | R$ 215
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$ 158 | R$ 168 | R$ 148
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$ 145 | R$ 126 | R$ 106
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$ 112 | R$ 123 | R$ 115
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$ 92 | R$ 138 | R$ 134
Horizontes Energia S A [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares | 10,000,000 |  |
Cemig interest % | 100.00% | 100.00% | 100.00%
Share capital | R$ 10 | R$ 39 | R$ 39
Equity | R$ 32 | R$ 61 | R$ 60
Cemig P C H S A [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares | 6,000,000 |  |
Cemig interest % | 100.00% | 100.00% | 100.00%
Share capital | R$ 6 | R$ 46 | R$ 46
Equity | R$ 51 | R$ 99 | R$ 90
Cemig Geracao Poco Fundo S A [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares | 139,084,745 |  |
Cemig interest % | 100.00% | 100.00% | 100.00%
Share capital | R$ 139 | R$ 139 | R$ 97
Equity | R$ 168 | R$ 172 | R$ 114
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%
Share capital |  | R$ 0 |
Equity | R$ 29 | R$ 11 | R$ 8
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$ 9 | R$ 6 | R$ 2
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$ 113 | R$ 120 | R$ 0
UFV Tres Marias [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares | 6,887,499 |  |
Cemig interest % | 100.00% | 100.00% |
Share capital | R$ 7 |  |
Equity | R$ 46 |  |
Cemig Distribuicao [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares | 2,359,113,452 |  |
Cemig interest % | 100.00% | 100.00% | 100.00%
Share capital | R$ 6,284 | R$ 5,372 | R$ 5,372
Equity | R$ 9,121 | R$ 7,105 | R$ 6,943
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$ 3,042
Equity | R$ 6,679 | R$ 6,570 | R$ 6,685
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$ 1,386 | R$ 1,373 | R$ 1,222
C E M I G Sim [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Number of shares | 306,664,742 |  |
Cemig interest % | 100.00% | 100.00% | 100.00%
Share capital | R$ 307 | R$ 175 | R$ 285
Equity | R$ 419 | R$ 199 | R$ 297
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 | R$ 37
Equity | R$ 80 | R$ 73 | R$ 65

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