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Investments - Principal Information on the Subsidiaries and Jointly-Controlled Entities (Detail) - BRL (R$) R$ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Share capital | R$ 6,294 | R$ 6,294 | R$ 6,294 |
Equity | R$ 14,330 | R$ 12,934 | R$ 12,988 | R$ 11,285
Subsidiaries and jointly-controlled entities [member] | Cemig Geracaoe Transmissao S A [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Cemig Geração e Transmissão |  |  |
Number of shares | 2,896,785,358 |  |  |
Cemig interest % | 100.00% | 100.00% | 100.00% |
Share capital | R$ 1,838 | R$ 1,838 | R$ 1,838 |
Equity | R$ 4,794 | R$ 4,583 | R$ 4,684 |
Subsidiaries and jointly-controlled entities [member] | Hidreletrica Cachoeirao SA [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Hidrelétrica Cachoeirão |  |  |
Number of shares | 35,000,000 |  |  |
Cemig interest % | 49.00% | 49.00% | 49.00% |
Share capital | R$ 35 | R$ 35 | R$ 35 |
Equity | R$ 118 | R$ 103 | R$ 83 |
Subsidiaries and jointly-controlled entities [member] | Guanhaes Energia SA [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Guanhães Energia |  |  |
Number of shares | 330,536,000 |  |  |
Cemig interest % | 49.00% | 49.00% | 49.00% |
Share capital | R$ 331 | R$ 186 | R$ 138 |
Equity | R$ 51 |  | R$ 38 |
Subsidiaries and jointly-controlled entities [member] | Hidreletrica Pipoca [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Hidrelétrica Pipoca |  |  |
Number of shares | 41,360,000 |  |  |
Cemig interest % | 49.00% | 49.00% | 49.00% |
Share capital | R$ 41 | R$ 41 | R$ 41 |
Equity | R$ 53 | R$ 65 | R$ 54 |
Subsidiaries and jointly-controlled entities [member] | Retiro Baixo Energtica SA [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Retiro Baixo |  |  |
Number of shares | 222,850,000 |  |  |
Cemig interest % | 49.90% | 49.90% | 49.90% |
Share capital | R$ 223 | R$ 223 | R$ 223 |
Equity | R$ 258 | R$ 264 | R$ 296 |
Subsidiaries and jointly-controlled entities [member] | Alianca Norte Energia Participacoes S A [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Aliança Norte (Belo Monte Plant) |  |  |
Number of shares | 3,622,440,125 |  |  |
Cemig interest % | 49.00% | 49.00% | 49.00% |
Share capital | R$ 1,119 | R$ 1,014 | R$ 647 |
Equity | R$ 1,066 | R$ 1,077 | R$ 723 |
Subsidiaries and jointly-controlled entities [member] | Madeira Energia SA [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Madeira Energia (Santo Antônio Plant) |  |  |
Number of shares | 9,730,201,137 |  |  |
Cemig interest % | 18.13% | 18.13% | 18.05% |
Share capital | R$ 9,547 | R$ 10,152 | R$ 9,762 |
Equity | R$ 5,327 | R$ 6,419 | R$ 7,642 |
Subsidiaries and jointly-controlled entities [member] | Lightger SA [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Lightger |  |  |
Number of shares | 79,078,937 |  |  |
Cemig interest % | 49.00% | 49.00% | 49.00% |
Share capital | R$ 79 | R$ 79 | R$ 79 |
Equity | R$ 83 | R$ 85 | R$ 76 |
Subsidiaries and jointly-controlled entities [member] | Baguari Energia SA [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Baguari Energia S.A. |  |  |
Number of shares | 26,157,300,278 |  |  |
Cemig interest % | 69.39% | 69.39% | 69.39% |
Share capital | R$ 187 | R$ 187 | R$ 262 |
Equity | R$ 214 | R$ 248 | R$ 270 |
Subsidiaries and jointly-controlled entities [member] | Renova Energia SA [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Renova |  |  |
Number of shares | 417,197,244 |  |  |
Cemig interest % | 36.23% | 34.15% | 27.37% |
Share capital | R$ 2,919 | R$ 2,856 | R$ 2,526 |
Equity | R$ 780 | R$ 1,956 | R$ 5,581 |
Subsidiaries and jointly-controlled entities [member] | Alianca Geracao de Energia [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Aliança Geração |  |  |
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$ 1,858 | R$ 1,973 | R$ 2,949 |
Subsidiaries and jointly-controlled entities [member] | Central Eolica Praias de Parajuru SA [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Central Eólica Praias de Parajuru |  |  |
Number of shares | 70,560,000 |  |  |
Cemig interest % | 49.00% | 49.00% | 49.00% |
Share capital | R$ 71 | R$ 71 | R$ 71 |
Equity | R$ 89 | R$ 89 | R$ 129 |
Subsidiaries and jointly-controlled entities [member] | Central Eolica Volta do Rio SA [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Central Eólica Volta do Rio |  |  |
Number of shares | 117,230,000 |  |  |
Cemig interest % | 49.00% | 49.00% | 49.00% |
Share capital | R$ 117 | R$ 117 | R$ 117 |
Equity | R$ 116 | R$ 137 | R$ 174 |
Subsidiaries and jointly-controlled entities [member] | Central Eolica Praias de Morgado [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Central Eólica Praias de Morgado |  |  |
Number of shares | 52,960,000 |  |  |
Cemig interest % | 49.00% | 49.00% | 49.00% |
Share capital | R$ 53 | R$ 53 | R$ 53 |
Equity | R$ 54 | R$ 65 | R$ 127 |
Subsidiaries and jointly-controlled entities [member] | Amazonia energia participacoes S A [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Amazônia Energia (Belo Monte Plant) |  |  |
Number of shares | 1,229,600,123 |  |  |
Cemig interest % | 74.50% | 74.50% | 74.50% |
Share capital | R$ 1,230 | R$ 1,116 | R$ 723 |
Equity | R$ 1,163 | R$ 1,048 | R$ 665 |
Subsidiaries and jointly-controlled entities [member] | Usina Hidreletrica Itaocara SA [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Usina Hidrelétrica Itaocara S.A. |  |  |
Number of shares | 11,102,420 |  |  |
Cemig interest % | 49.00% | 49.00% |  |
Share capital | R$ 11 | R$ 6 |  |
Equity | R$ 8 | R$ 6 |  |
Subsidiaries and jointly-controlled entities [member] | Cemig Distribuicao [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Cemig Distribuição |  |  |
Number of shares | 2,359,113,452 |  |  |
Cemig interest % | 100.00% | 100.00% | 100.00% |
Share capital | R$ 2,772 | R$ 2,362 | R$ 2,362 |
Equity | R$ 3,737 | R$ 2,500 | R$ 2,696 |
Subsidiaries and jointly-controlled entities [member] | Light SA [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Light |  |  |
Number of shares | 203,934,060 |  |  |
Cemig interest % | 26.06% | 26.06% | 26.06% |
Share capital | R$ 2,226 | R$ 2,226 | R$ 2,226 |
Equity | R$ 3,462 | R$ 3,354 | R$ 4,558 |
Subsidiaries and jointly-controlled entities [member] | Cemig Telecom [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | CemigTelecom |  |  |
Number of shares | 448,340,822 |  |  |
Cemig interest % | 100.00% | 100.00% | 100.00% |
Share capital | R$ 292 | R$ 242 | R$ 225 |
Equity | R$ 247 | R$ 192 | R$ 169 |
Subsidiaries and jointly-controlled entities [member] | Rosal Energia SA [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Rosal Energia |  |  |
Number of shares | 46,944,467 |  |  |
Cemig interest % | 100.00% | 100.00% | 100.00% |
Share capital | R$ 47 | R$ 47 | R$ 47 |
Equity | R$ 107 | R$ 141 | R$ 122 |
Subsidiaries and jointly-controlled entities [member] | Sa Carvalho S A [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Sá Carvalho |  |  |
Number of shares | 361,200,000 |  |  |
Cemig interest % | 100.00% | 100.00% | 100.00% |
Share capital | R$ 37 | R$ 37 | R$ 37 |
Equity | R$ 103 | R$ 106 | R$ 103 |
Subsidiaries and jointly-controlled entities [member] | Companhiade Gasde Minas Gerais [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Gasmig |  |  |
Number of shares | 409,255,483 |  |  |
Cemig interest % | 99.57% | 99.57% | 99.57% |
Share capital | R$ 665 | R$ 665 | R$ 665 |
Equity | R$ 1,224 | R$ 1,426 | R$ 1,408 |
Subsidiaries and jointly-controlled entities [member] | Horizontes Energia SA [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Horizontes Energia |  |  |
Number of shares | 39,257,563 |  |  |
Cemig interest % | 100.00% | 100.00% | 100.00% |
Share capital | R$ 39 | R$ 39 | R$ 64 |
Equity | R$ 53 | R$ 52 | R$ 71 |
Subsidiaries and jointly-controlled entities [member] | Usina Termica Ipatinga [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Usina Térmica Ipatinga |  |  |
Number of shares | 174,281 |  |  |
Cemig interest % | 100.00% | 100.00% | 100.00% |
Equity | R$ 5 | R$ 4 | R$ 4 |
Subsidiaries and jointly-controlled entities [member] | Cemig PCH SA [Member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Cemig PCH |  |  |
Number of shares | 35,952,000 |  |  |
Cemig interest % | 100.00% | 100.00% | 100.00% |
Share capital | R$ 36 | R$ 36 | R$ 36 |
Equity | R$ 97 | R$ 92 | R$ 85 |
Subsidiaries and jointly-controlled entities [member] | Lepsa [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Lepsa |  |  |
Number of shares | 1,379,839,905 |  |  |
Cemig interest % | 100.00% | 66.62% |  |
Share capital | R$ 406 | R$ 438 |  |
Equity | R$ 456 | R$ 443 |  |
Subsidiaries and jointly-controlled entities [member] | Rio Minas Energia Participacoes SA [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | RME |  |  |
Number of shares | 1,365,421,406 |  |  |
Cemig interest % | 75.00% | 66.27% |  |
Share capital | R$ 403 | R$ 434 |  |
Equity | R$ 453 | R$ 440 |  |
Subsidiaries and jointly-controlled entities [member] | Companhia Transleste de Transmissao [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Companhia Transleste de Transmissão |  |  |
Number of shares | 49,569,000 |  |  |
Cemig interest % |  | 25.00% | 25.00% |
Share capital | R$ 50 | R$ 50 | R$ 50 |
Equity |  | R$ 81 | R$ 73 |
Subsidiaries and jointly-controlled entities [member] | UTE Barreiro SA [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | UTE Barreiro |  |  |
Cemig interest % | 100.00% | 100.00% | 100.00% |
Share capital | R$ 17 | R$ 31 | R$ 31 |
Equity | R$ 18 | R$ 39 | R$ 30 |
Subsidiaries and jointly-controlled entities [member] | Companhia Transudeste de Transmissao [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Companhia Transudeste de Transmissão |  |  |
Number of shares | 30,000,000 |  |  |
Cemig interest % |  | 24.00% | 24.00% |
Share capital | R$ 30 | R$ 30 | R$ 30 |
Equity |  | R$ 85 | R$ 73 |
Subsidiaries and jointly-controlled entities [member] | Empresa de Comercializacao de Energia Eletrica [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Empresa de Comercialização de Energia Elétrica |  |  |
Number of shares | 486,000 |  |  |
Cemig interest % | 100.00% | 100.00% | 100.00% |
Equity | R$ 18 | R$ 20 | R$ 9 |
Subsidiaries and jointly-controlled entities [member] | Companhia Transirape de Transmissao [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Companhia Transirapé de Transmissão |  |  |
Number of shares | 22,340,490 |  |  |
Cemig interest % |  | 24.50% | 24.50% |
Share capital | R$ 22 | R$ 22 | R$ 22 |
Equity |  | R$ 98 | R$ 79 |
Subsidiaries and jointly-controlled entities [member] | Transchile Charrua Transmision SA [Member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Cemig interest % |  |  | 49.00% |
Share capital |  |  | R$ 237 |
Equity |  |  | R$ 221 |
Subsidiaries and jointly-controlled entities [member] | Efficientia SA [Member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Efficientia |  |  |
Number of shares | 6,051,994 |  |  |
Cemig interest % | 100.00% | 100.00% | 100.00% |
Share capital | R$ 6 | R$ 6 | R$ 6 |
Equity | R$ 7 | R$ 5 | R$ 6 |
Subsidiaries and jointly-controlled entities [member] | Cemig Comercializadora de Energia Incentivada [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Cemig Comercializadora de Energia Incentivada |  |  |
Number of shares | 1,000,000 |  |  |
Cemig interest % | 100.00% | 100.00% | 100.00% |
Share capital | R$ 1 | R$ 1 | R$ 5 |
Equity | R$ 2 | R$ 2 | R$ 6 |
Subsidiaries and jointly-controlled entities [member] | Companhia de Transmissao Centroeste de Minas [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Companhia de Transmissão Centroeste de Minas |  |  |
Number of shares | 28,000,000 |  |  |
Cemig interest % | 51.00% | 51.00% | 51.00% |
Share capital | R$ 28 | R$ 28 | R$ 28 |
Equity | R$ 40 | R$ 42 | R$ 34 |
Subsidiaries and jointly-controlled entities [member] | Cemig Trading SA [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Cemig Trading |  |  |
Number of shares | 1,000,000 |  |  |
Cemig interest % | 100.00% | 100.00% | 100.00% |
Share capital | R$ 1 | R$ 1 |  |
Equity | R$ 29 | R$ 29 | R$ 30 |
Subsidiaries and jointly-controlled entities [member] | Axxiom solucoesTecnologicas S.A. [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Axxiom Soluções Tecnológicas |  |  |
Number of shares | 17,200,000 |  |  |
Cemig interest % | 49.00% | 49.00% | 49.00% |
Share capital | R$ 47 | R$ 47 | R$ 47 |
Equity | R$ 24 | R$ 39 | R$ 49 |
Subsidiaries and jointly-controlled entities [member] | Parati [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Parati |  |  |
Number of shares | 1,432,910,602 |  |  |
Cemig interest % |  |  | 25.00% |
Share capital |  |  | R$ 1,433 |
Equity |  |  | R$ 1,431 |
Subsidiaries and jointly-controlled entities [member] | Transmissora Alianca de Energia Eletrica S.A. [member] |  |  |  |
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items] |  |  |  |
Name of subsidiary | Taesa |  |  |
Number of shares | 1,033,496,721 |  |  |
Cemig interest % | 21.68% | 31.54% | 43.36% |
Share capital | R$ 3,042 | R$ 3,042 | R$ 3,042 |
Equity | R$ 4,347 | R$ 4,308 | R$ 5,171 |

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