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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
IfrsStatementLineItems [Line Items]        
Share capital R$ 8,467 R$ 7,594    
Equity R$ 19,462 R$ 17,478 R$ 16,103 R$ 16,084
UFV Janauba Geracao de Energia Eletrica Distribuida [member]        
IfrsStatementLineItems [Line Items]        
Number of shares 18,509,900,000,000      
Cemig interest % 49.00% 49.00%    
Share capital R$ 7 R$ 19    
Equity R$ 5   R$ 22  
U F V Corinto Geracao De Energia Eletrica Distriiuida [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 18,000,000,000,000      
Cemig interest % 49.00% 49.00%    
Share capital R$ 18 R$ 18    
Equity R$ 19 R$ 20    
U F V Manga Geracao De Energia Eletrica Distribuida [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 21,660,575,000,000      
Cemig interest % 49.00% 49.00%    
Share capital R$ 21 R$ 21    
Equity R$ 22 R$ 24    
U F V Bonfinopolis I I Geracao De Energia Eletrica Distribuida [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 13,197,187,000,000      
Cemig interest % 49.00% 49.00%    
Share capital R$ 13 R$ 13    
Equity R$ 13 R$ 13    
U F V Lagoa Grande Geracao De Energia Eletrica Distribuida [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 25,471,844,000,000      
Cemig interest % 49.00% 49.00%    
Share capital R$ 25 R$ 25    
Equity R$ 26 R$ 26    
U F V Lontra Geracao De Energia Eletrica Distribuida [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 29,010,219,000,000      
Cemig interest % 49.00% 49.00%    
Share capital R$ 29 R$ 29    
Equity R$ 29 R$ 29    
U F V Mato Verde Geracao De Energia Eletrica Distribuida [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 11,030,391,000,000      
Cemig interest % 49.00% 49.00%    
Share capital R$ 11 R$ 11    
Equity R$ 11 R$ 12    
U F V Mirabela Geracao De Energia Eletrica Distribuida [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 9,320,875,000,000      
Cemig interest % 49.00% 49.00%    
Share capital R$ 9 R$ 9    
Equity R$ 9 R$ 9    
U F V Porteirinha I Geracao De Energia Eletrica Distribuida [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 12,348,392,000,000      
Cemig interest % 49.00% 49.00%    
Share capital R$ 12 R$ 12    
Equity R$ 13 R$ 13    
U F V Porteirinha I I Geracao De Energia Eletrica Distribuida [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 11,702,733,000,000      
Cemig interest % 49.00% 49.00%    
Share capital R$ 12 R$ 12    
Equity R$ 12 R$ 12    
U F V Brasilandia Geracao De Energia Eletrica Distribuida [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 25,629,900,000,000      
Cemig interest % 49.00%      
Share capital R$ 26      
Equity R$ 27      
Cemig Geracao E Transmissao [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares [1] 2,896,785,358,000,000      
Cemig interest % [1] 10000.00% 100.00% 100.00%  
Share capital [1] R$ 4,124 R$ 4,000 R$ 2,600  
Equity [1] R$ 7,755 R$ 5,842 R$ 5,348  
Madeira Energia 1 [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares [2] 12,034,025,147,000,000      
Cemig interest % [2] 15.51% 15.51% 15.51%  
Share capital [2] R$ 10,620 R$ 10,620 R$ 10,620  
Equity [2] R$ 1,492 R$ 2,259 R$ 3,705  
Hidreletrica cachoeirao [member]        
IfrsStatementLineItems [Line Items]        
Number of shares 35,000,000,000,000      
Cemig interest % 49.00% 49.00% 49.00%  
Share capital R$ 35 R$ 35 R$ 35  
Equity R$ 120 R$ 110 R$ 110  
Guanhaes Energia [member]        
IfrsStatementLineItems [Line Items]        
Number of shares [3] 548,626,000,000,000      
Cemig interest % [3] 49.00% 49.00% 49.00%  
Share capital [3] R$ 549 R$ 549 R$ 549  
Equity [3] R$ 255 R$ 268 R$ 268  
Hidreletrica Pipoca [member]        
IfrsStatementLineItems [Line Items]        
Number of shares 41,360,000,000,000      
Cemig interest % 49.00% 49.00% 49.00%  
Share capital R$ 41 R$ 41 R$ 41  
Equity R$ 95 R$ 73 R$ 63  
Baguari Energia [member]        
IfrsStatementLineItems [Line Items]        
Number of shares [4] 26,157,300,278,000,000      
Cemig interest % [4] 69.39% 69.39% 69.39%  
Share capital [4] R$ 187 R$ 187 R$ 187  
Equity [4] R$ 243 R$ 229 R$ 227  
Central Eolica Praias De Parajuru [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 85,834,843,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 86 R$ 71 R$ 72  
Equity R$ 128 R$ 107 R$ 89  
Central Eolica Volta Do Rio [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 274,867,441,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 275 R$ 117 R$ 139  
Equity R$ 207 R$ 171 R$ 58  
Lightger [member]        
IfrsStatementLineItems [Line Items]        
Number of shares 79,078,937,000,000      
Cemig interest % 49.00% 49.00% 49.00%  
Share capital R$ 79 R$ 79 R$ 79  
Equity R$ 98 R$ 106 R$ 95  
Alianca norte [member]        
IfrsStatementLineItems [Line Items]        
Number of shares 41,923,360,811,000,000      
Cemig interest % 49.00% 49.00% 49.00%  
Share capital R$ 1,209 R$ 1,209 R$ 1,208  
Equity R$ 1,148 R$ 1,189 R$ 1,266  
Amazonia Energia [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares [4] 1,322,597,723,000,000      
Cemig interest % [4] 74.50% 74.50% 74.50%  
Share capital [4] R$ 1,323 R$ 1,323 R$ 1,323  
Equity [4] R$ 1,252 R$ 1,296 R$ 1,380  
Alianca geracao [member]        
IfrsStatementLineItems [Line Items]        
Number of shares 1,291,582,500,000,000      
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]        
IfrsStatementLineItems [Line Items]        
Number of shares 225,350,000,000,000      
Cemig interest % 49.90% 49.90% 49.90%  
Share capital R$ 225 R$ 225 R$ 225  
Equity R$ 346 R$ 325 R$ 300  
Usina Hidreletrica Itaocara S A [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 156,259,500,000,000      
Cemig interest % 49.00% 49.00% 49.00%  
Share capital R$ 156 R$ 72 R$ 69  
Equity R$ (42) R$ (60) R$ (45)  
Cemig Ger Tres Marias S A [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 1,291,423,369,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 1,291 R$ 1,291 R$ 1,291  
Equity R$ 1,652 R$ 1,452 R$ 1,408  
Cemig Ger Salto Grande S A [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 405,267,607,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 405 R$ 405 R$ 405  
Equity R$ 527 R$ 455 R$ 446  
Cemig Ger Itutinga S A [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 151,309,332,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 151 R$ 151 R$ 151  
Equity R$ 212 R$ 180 R$ 184  
Cemig Geracao Camargos S A [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 113,499,102,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 113 R$ 113 R$ 113  
Equity R$ 165 R$ 144 R$ 136  
Cemig Geracao Sul S A [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 148,146,505,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 148 R$ 148 R$ 148  
Equity R$ 215 R$ 174 R$ 179  
Cemig Geracao Leste S A [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 100,568,929,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 101 R$ 101 R$ 101  
Equity R$ 148 R$ 127 R$ 127  
Cemig Geracao Oeste S A [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 60,595,484,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 61 R$ 61 R$ 61  
Equity R$ 106 R$ 84 R$ 73  
Rosal Energia S A [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 46,944,467,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 47 R$ 47 R$ 47  
Equity R$ 115 R$ 127 R$ 128  
Sa Carvalho S A [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 361,200,000,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 37 R$ 37 R$ 37  
Equity R$ 134 R$ 115 R$ 124  
Horizontes Energia S A [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 39,257,563,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 39 R$ 39 R$ 39  
Equity R$ 60 R$ 55 R$ 57  
Cemig P C H S A [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 45,952,000,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 46 R$ 46 R$ 46  
Equity R$ 90 R$ 90 R$ 98  
Cemig Geracao Poco Fundo S A [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares [5] 97,161,578,000,000      
Cemig interest % [5] 100.00% 100.00% 100.00%  
Share capital [5] R$ 97 R$ 1 R$ 1  
Equity [5] R$ 114 R$ 4 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%  
Share capital      
Equity R$ 8 R$ 57 R$ 28  
Cemig Trading S A [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 1,000,000,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 1 R$ 1 R$ 1  
Equity R$ 2 R$ 30 R$ 31  
Cemig Distribuicao [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 2,359,113,452,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 5,372 R$ 5,372 R$ 5,372  
Equity R$ 6,943 R$ 6,022 R$ 4,708  
Taesa [member]        
IfrsStatementLineItems [Line Items]        
Number of shares 1,033,496,721,000,000      
Cemig interest % 21.68% 21.68% 21.68%  
Share capital R$ 3,042 R$ 3,042 R$ 3,042  
Equity R$ 6,685 R$ 6,026 4,927  
Ativas data center [member]        
IfrsStatementLineItems [Line Items]        
Number of shares 456,540,718,000,000      
Cemig interest % 19.60% 19.60%    
Share capital R$ 182 R$ 182 182  
Equity R$ 80 R$ 86 R$ 82  
Gasmig [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 409,255,483,000,000      
Cemig interest % 99.57% 9957.00% 9957.00%  
Share capital R$ 665 R$ 665 R$ 665  
Equity R$ 1,222 R$ 1,079 R$ 988  
Efficientia [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 24,431,845,000,000      
Cemig interest % 100.00% 100.00% 100.00%  
Share capital R$ 102 R$ 24 R$ 15  
Equity R$ 111 R$ 94 R$ 17  
Companhia De Transmissao Centroeste De Minas [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 28,000,000,000,000      
Cemig interest % 100.00% 51.00% 51.00%  
Share capital R$ 28 R$ 28 R$ 28  
Equity R$ 118 R$ 47  
Sete Lagoas Transmissora De Energia [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 36,857,080,000,000      
Cemig interest % 100.00%      
Share capital R$ 37      
Equity R$ 65      
Axxiom Solucoes Tecnologicas [Member]        
IfrsStatementLineItems [Line Items]        
Number of shares 68,064,706,000,000      
Cemig interest % 49.00% 49.00% 49.00%  
Share capital R$ 68 R$ 65 R$ 58  
Equity R$ 9 R$ 9 R$ 27  
[1] On July 30, 2021, the Company made an advance for future capital increase in Cemig GT, of R$1,350, in order to provide the resources for the Cash Tender offer implementation. For further information about the Tender Offer, please see Note 22.
[2] The total of Shareholders’ equity originally disclosed by the investee was adjusted by the Company for the purposes of posting equity income (change in the value of equity in non-consolidated investees), to take into account the modifying subsequent events resulting from the judgments given in the arbitration proceedings to which Saesa is a party. There is more information below in this note.
[3] On December 9, 2021, Light disclosed to the market that it had signed a share purchase agreement with Brasal Energia S.A. for sale of its equity interest in Guanhães and LightGer, subject to the conditions precedent that are usual in this type of transaction. Brasal Energia S.A will join this investee existing shareholders’ agreements, complying fully with their terms.
[4] Jointly-control under a Shareholders’ Agreement.
[5] On February 23, 2021, Aneel authorized through Resolution 9,735 the Company transfer of ownership of the concession of the Poço Fundo Small Hydro Plant from Cemig Geração e Transmissão S.A. to Cemig Geração Poço Fundo S.A. The transfer was formalized by signature of a new concession contract, Nº. 01/2021, on April 16, 2021. In the third quarter, Cemig GT transferred to this investee, as an advance against future capital increase, the assets related to the Poço Fundo Small Hydro Plant, in the amount of R$77, as well as the amount of R$20, in cash. In the fourth quarter of 2021 the Company made a further injection, of R$40, into this investee, in cash.