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18. INVESTMENTS (Details 4) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about investment property [line items]        
Share capital R$ 7,294 R$ 7,294 R$ 7,294  
Equity R$ 15,891 R$ 15,939 R$ 14,330 R$ 12,934
Cemig Geracao E Transmissao [Member]        
Disclosure of detailed information about investment property [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$ 2,600 R$ 2,600 R$ 1,838  
Equity R$ 5,136 R$ 4,980 R$ 4,794  
Madeira Energia (Santo Antonio plant) [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Madeira Energia (Santo Antônio plant)      
Number of shares 12,034,025,147      
Cemig interest % 15.51% 15.51% 18.13%  
Share capital R$ 10,620 R$ 10,620 R$ 9,547  
Equity R$ 3,705 R$ 4,657 R$ 5,327  
Hidreletrica Cachoeirao [Member]        
Disclosure of detailed information about investment property [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$ 110 R$ 100 R$ 118  
Guanhaes Energia [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Guanhães Energia      
Number of shares 548,626,000      
Cemig interest % 49.00% 49.00% 49.00%  
Share capital R$ 549 R$ 396 R$ 331  
Equity R$ 268 R$ 228 R$ 51  
Hidreletrica Pipoca [Member]        
Disclosure of detailed information about investment property [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$ 63 R$ 63 R$ 53  
Baguari Energia [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary [1] Baguari Energia      
Number of shares [1] 26,157,300,278      
Cemig interest % [1] 69.39% 69.39% 69.39%  
Share capital [1] R$ 187 R$ 187 R$ 187  
Equity [1] R$ 227 R$ 234 R$ 214  
Central Eolica Praias De Parajuru [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Central Eólica Praias de Parajuru      
Number of shares 71,834,843      
Cemig interest % 100.00% 100.00% 49.00%  
Share capital R$ 72 R$ 72 R$ 71  
Equity R$ 89 R$ 80 R$ 89  
Central Eolica Volta do Rio [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Central Eólica Volta do Rio      
Number of shares 138,867,440      
Cemig interest % 100.00% 100.00% 49.00%  
Share capital R$ 139 R$ 139 R$ 117  
Equity R$ 58 R$ 84 R$ 116  
Central Eolica Praias De Morgado [Member]        
Disclosure of detailed information about investment property [line items]        
Number of shares      
Cemig interest % 49.00%  
Share capital R$ 53  
Equity R$ 54  
Lightger [Member]        
Disclosure of detailed information about investment property [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$ 95 R$ 86 R$ 83  
Alianca Norte (Belo Monte plant) [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Aliança Norte (Belo Monte plant)      
Number of shares 41,893,675,837      
Cemig interest % 49.00% 49.00% 49.00%  
Share capital R$ 1,208 R$ 1,206 R$ 1,119  
Equity R$ 1,266 R$ 1,247 R$ 1,066  
Amazonia Energia (Belo Monte plant) [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary [1] Amazônia Energia (Belo Monte plant)      
Number of shares [1] 1,322,597,723      
Cemig interest % [1] 74.50% 74.50% 74.50%  
Share capital [1] R$ 1,323 R$ 1,322 R$ 1,230  
Equity [1] R$ 1,380 R$ 1,359 R$ 1,163  
Alianca Geracao [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Aliança Geração      
Number of shares 1,291,582      
Cemig interest % 45.00% 45.00% 45.00%  
Share capital R$ 1,291 R$ 1,291 R$ 1,291  
Equity R$ 1,858 R$ 1,858 R$ 1,858  
Retiro Baixo [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Retiro Baixo      
Number of shares 225,350,000      
Cemig interest % 49.90% 49.90% 49.90%  
Share capital R$ 225 R$ 223 R$ 223  
Equity R$ 300 R$ 278 R$ 258  
Renova [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary [1],[2] Renova      
Number of shares [1],[2] 41,719,724      
Cemig interest % [1],[2] 36.23% 36.23% 36.23%  
Share capital [1],[2] R$ 2,961 R$ 2,919 R$ 2,919  
Equity [1],[2] R$ (1,091) R$ (76) R$ 780  
Usina Hidreletrica Itaocara S.A. [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary [3] Usina Hidrelétrica Itaocara S.A      
Number of shares [3] 69,282,514      
Cemig interest % [3] 49.00% 49.00% 49.00%  
Share capital [3] R$ 69 R$ 22 R$ 11  
Equity [3] R$ (45) R$ 10 R$ 8  
Cemig Ger.Tres Marias S.A. [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Cemig Ger.Três Marias S.A.      
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$ 1,408 R$ 1,396 R$ 1,392  
Cemig Ger.Salto Grande S.A [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Cemig Ger.Salto Grande S.A      
Number of shares 405,267,607      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 405 R$ 405 R$ 405  
Equity R$ 446 R$ 440 R$ 440  
Cemig Ger. Itutinga S.A. [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Cemig Ger. Itutinga S.A.      
Number of shares 151,309,332      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 151 R$ 151 R$ 151  
Equity R$ 184 R$ 179 R$ 171  
Cemig Geracao Camargos S.A. [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Cemig Geração Camargos S.A.      
Number of shares 113,499,102      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 113 R$ 113 R$ 113  
Equity R$ 136 R$ 132 R$ 130  
Cemig Geracao Sul S.A. [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Cemig Geração Sul S.A.      
Number of shares 148,146,505      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 148 R$ 148 R$ 148  
Equity R$ 179 R$ 176 R$ 168  
Cemig Geracao Leste S.A. [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Cemig Geração Leste S.A.      
Number of shares 100,568,929      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 101 R$ 101 R$ 101  
Equity R$ 127 R$ 121 R$ 116  
Cemig Geracao Oeste S.A. [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Cemig Geração Oeste S.A.      
Number of shares 60,595,484      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 61 R$ 61 R$ 61  
Equity R$ 73 R$ 70 R$ 69  
Rosal Energia S.A. [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Rosal Energia S.A. (‘Rosal’)      
Number of shares 46,944,467      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 47 R$ 47 R$ 47  
Equity R$ 128 R$ 125 R$ 107  
Sa Carvalho S.A. [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Sá Carvalho S.A. (‘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$ 124 R$ 94 R$ 103  
Horizontes Energia S.A [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Horizontes Energia S.A. (‘Horizontes’)      
Number of shares 39,257,563      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 39 R$ 39 R$ 39  
Equity R$ 57 R$ 55 R$ 53  
Cemig PCH S.A. [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Cemig PCH S.A. (‘PCH’)      
Number of shares 45,952,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 46 R$ 46 R$ 36  
Equity R$ 98 R$ 93 R$ 97  
Cemig Geracao Poco Fundo S.A. [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary [4] Cemig Geração Poço Fundo S.A.      
Number of shares [4] 1,402,000      
Cemig interest % [4] 100.00% 100.00% 100.00%  
Share capital [4] R$ 1 R$ 17 R$ 17  
Equity [4] R$ 4 R$ 18 R$ 18  
Empresa De Servicos De Comercializacao De Energia Eletrica S.A. [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Empresa de Serviços de Comercialização de Energia Elétrica S.A.      
Number of shares 486,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital  
Equity R$ 28 R$ 27 R$ 18  
Cemig Comercializadora De Energia Incentivada S.A. [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Cemig Comercializadora de Energia Incentivada S.A.      
Number of shares 1,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 1 R$ 1 R$ 1  
Equity R$ 3 R$ 3 R$ 2  
Cemig Trading S.A. [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Cemig Trading S.A. (‘Cemig Trading’)      
Number of shares 1,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 1 R$ 1 R$ 1  
Equity R$ 31 R$ 28 R$ 29  
Cemig Distribuicao [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary [3] Cemig Distribuição      
Number of shares [3] 2,359,113,452      
Cemig interest % [3] 100.00% 100.00% 100.00%  
Share capital [3] R$ 5,372 R$ 2,772 R$ 2,772  
Equity [3] R$ 4,708 R$ 4,642 R$ 3,737  
Light [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Light      
Number of shares 303,934,060      
Cemig interest % 22.58% 26.06% 26.06%  
Share capital R$ 4,051 R$ 2,226 R$ 2,226  
Equity R$ 5,983 R$ 3,389 R$ 3,462  
TAESA [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary TAESA      
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$ 4,927 R$ 4,572 R$ 4,347  
Cemig Telecom [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Cemig Telecom      
Number of shares      
Cemig interest % 100.00%  
Share capital R$ 292  
Equity R$ 247  
Ativas Data Center [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Ativas Data Center      
Number of shares 456,540,718      
Cemig interest % 19.60% 19.60%  
Share capital R$ 182 R$ 182  
Equity R$ 82 R$ 84  
GASMIG [Member]        
Disclosure of detailed information about investment property [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$ 988 R$ 1,001 R$ 1,224  
Cemig Geracao Distribuida [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Cemig Geração Distribuída      
Number of shares 174,281      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 0 R$ 0  
Equity R$ 11 R$ 3 R$ 5  
LEPSA [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary [5] LEPSA      
Number of shares [5]      
Cemig interest % [5] 100.00% 100.00%  
Share capital [5] R$ 406 R$ 406  
Equity [5] R$ 447 R$ 456  
RME [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary [5] RME      
Number of shares [5]      
Cemig interest % [5] 100.00% 75.00%  
Share capital [5] R$ 403 R$ 403  
Equity [5] R$ 423 R$ 453  
Efficientia [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Efficientia      
Number of shares 15,121,845      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 15 R$ 15 R$ 6  
Equity R$ 17 R$ 18 R$ 7  
Companhia De Transmissao Centroeste De Minas [Member]        
Disclosure of detailed information about investment property [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$ 47 R$ 39 R$ 40  
Axxiom Solucoes Tecnologicas [Member]        
Disclosure of detailed information about investment property [line items]        
Name of subsidiary Axxiom Soluções Tecnológicas      
Number of shares 58,365,000      
Cemig interest % 49.00% 49.00% 49.00%  
Share capital R$ 58 R$ 47 R$ 47  
Equity R$ 27 R$ 17 R$ 24  
[1] Jointly-control under a Shareholders' Agreement.
[2] In view of Renova's negative net equity, the Company reduced to zero the carrying value of its equity interests in this investee, at December 31, 2018.
[3] An Extraordinary General Shareholders' Meeting held on August 7, 2019 approved increase in the share capital of Cemig D by R$2,600, through subscription of funds from Advances for Future Capital Increase (AFACs), paid in by the Company, without issuance of new shares.
[4] The Extraordinary General Meeting of Shareholders held on August 29, 2019 approved changes to the bylaws of the subsidiary, changing its name and its corporate objects. With the alteration, the name of Usina Termeletrica Barreiro S.A. was changed to Cemig Geracao Poco Fundo S.A.
[5] These investees were merged on April 24, 2019.