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INVESTMENTS (Details 1) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Beginning balance R$ 4,923 R$ 5,385 R$ 5,378
Gain (loss) by equity method (Income statement) 845 182 357 [1]
Dividends (519) (654) (399)
Ending balance 5,107 4,923 5,385
Other (193) (6) 13
Additions / acquisitions 51 56 119
Losses on investments   (40)  
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)     37
Disposals     (120)
Hidreletrica cachoeirao [member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 59 53 54
Gain (loss) by equity method (Income statement) 15 14 9 [1]
Dividends (27) (8) (10)
Ending balance 47 59 53
Guanhaes Energia [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 125 131 [2] 131 [2]
Gain (loss) by equity method (Income statement) 58 (6)  
Ending balance 183 125 131 [2]
Hidreletrica pipoca [member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 47 36 31
Gain (loss) by equity method (Income statement) 16 11 11 [1]
Dividends (16)   (6)
Ending balance 47 47 36
M E S A [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance    
Gain (loss) by equity method (Income statement) 10    
Ending balance 10  
Fip Melbourne [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance [3],[4] 158 385
Gain (loss) by equity method (Income statement) 169 [3],[4] (158) (227) [1]
Ending balance 8 [3],[4] [3],[4] 158
Other [3],[4] (161)    
Lightger [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 124 131 [2] 128 [2]
Gain (loss) by equity method (Income statement) 17 5 10 [1],[2]
Dividends (7) (12) (7) [2]
Ending balance 134 124 131 [2]
Baguari Energia [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 168 159 157
Gain (loss) by equity method (Income statement) 22 31 23 [1]
Dividends (30) (22) (21)
Ending balance 160 168 159
Amazonia Energia [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 933 [5] 965 1,028
Gain (loss) by equity method (Income statement) (47) [5] (32) (63) [1]
Ending balance 886 [5] 933 [5] 965
Alianca norte (belo monte plant) [member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 609 [5] 631 671
Gain (loss) by equity method (Income statement) (33) [5] (22) (40) [1]
Ending balance 576 [5] 609 [5] 631
Ativas [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 16    
Gain (loss) by equity method (Income statement) (1)    
Ending balance 16  
Other (15)    
Taesa [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 1,580 1,467 1,213
Gain (loss) by equity method (Income statement) 305 481 494 [1]
Dividends (336) (368) (240)
Ending balance 1,549 1,580 1,467
Alianca Geracao [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 1,141 1,167 1,192
Gain (loss) by equity method (Income statement) 104 199 89 [1]
Dividends (48) (225) (114)
Ending balance 1,194 1,141 1,167
Other (3)    
Retiro Baixo [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 201 195 180
Gain (loss) by equity method (Income statement) 22 13 15 [1]
Dividends (38) (7)  
Ending balance 185 201 195
U F V Janauba Geracao De Energia Eletrica Distribuida [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 3 10 10
Gain (loss) by equity method (Income statement) 1 1 1 [1]
Dividends (1) (2) (1)
Ending balance 3 3 10
Other   (6)  
U F V Corinto Geracao De Energia Eletrica Distriiuida [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 9 [6] 10  
Gain (loss) by equity method (Income statement) 2 [6]   1 [1]
Dividends (2) [6] (1)  
Ending balance 8 [6] 9 [6] 10
Other [6] (1)    
Additions / acquisitions     9
U F V Manga Geracao De Energia Eletrica Distribuida [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 11 [6] 11  
Gain (loss) by equity method (Income statement) 3 [6] 2 1 [1]
Dividends (2) [6] (2)  
Ending balance 11 [6] 11 [6] 11
Other [6] (1)    
Additions / acquisitions     10
U F V Bonfinopolis I I Geracao De Energia Eletrica Distribuida [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 6 [6] 6
Gain (loss) by equity method (Income statement) [6] 1    
Dividends [6] (1)    
Ending balance 5 [6] 6 [6] 6
Other [6] (1)    
Additions / acquisitions     6
U F V Lagoa Grande Geracao De Energia Eletrica Distribuida [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 15 [6] 15
Gain (loss) by equity method (Income statement) 3 [6] 2 3 [1]
Dividends (2) [6] (2)  
Ending balance 15 [6] 15 [6] 15
Other [6] (1)    
Additions / acquisitions     12
U F V Lontra Geracao De Energia Eletrica Distribuida [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 18 [6] 17
Gain (loss) by equity method (Income statement) 4 [6] 1 3 [1]
Dividends [6] (3)    
Ending balance 18 [6] 18 [6] 17
Other [6] (1)    
Additions / acquisitions     14
U F V Mato Verde Geracao De Energia Eletrica Distribuida [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 6 [6] 6
Gain (loss) by equity method (Income statement) 1 [6] 1 1 [1]
Dividends (1) [6] (1)  
Ending balance 6 [6] 6 [6] 6
Additions / acquisitions     5
U F V Mirabela Geracao De Energia Eletrica Distribuida [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 4 [6] 4
Gain (loss) by equity method (Income statement) 1 [6] 1  
Dividends (1) [6] (1)  
Ending balance 4 [6] 4 [6] 4
Other     (1)
Additions / acquisitions     5
U F V Porteirinha I Geracao De Energia Eletrica Distribuida [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 5 [6] 6
Gain (loss) by equity method (Income statement) [6] 1    
Dividends (1) [6] (1)  
Ending balance 4 [6] 5 [6] 6
Other [6] (1)    
Additions / acquisitions     6
U F V Porteirinha I I Geracao De Energia Eletrica Distribuida [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 7 [6] 7
Gain (loss) by equity method (Income statement) 1 [6] 1 1 [1]
Dividends (1) [6] (1)  
Ending balance 7 [6] 7 [6] 7
Additions / acquisitions     6
U F V Brasilandia Geracao De Energia Eletrica Distribuida [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance [7] 15 [6]  
Gain (loss) by equity method (Income statement) 3 [6] 4 [7]  
Dividends (2) [6] (1) [7]  
Ending balance 15 [6] 15 [6],[7] [7]
Other [6] (1)    
Additions / acquisitions [7]   12  
Apolo I S P E Empreendimentos E Energia [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance    
Gain (loss) by equity method (Income statement) 1    
Ending balance 7  
Additions / acquisitions 6    
U F V Campo Lindo I [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance    
Gain (loss) by equity method (Income statement) 1    
Ending balance 8  
Additions / acquisitions 7    
U F V Campo Lindo I I [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance    
Gain (loss) by equity method (Income statement) 2    
Ending balance 9  
Additions / acquisitions 7    
U F V Olaria I [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance    
Gain (loss) by equity method (Income statement) 1    
Ending balance 8  
Additions / acquisitions 7    
Axxiom [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 4    
Gain (loss) by equity method (Income statement) (4)    
Ending balance 4  
Itaocara [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance    
Gain (loss) by equity method (Income statement) (3)    
Ending balance  
Other (7)    
Additions / acquisitions 10    
Total of investments [member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 5,106 5,415 5,400
Gain (loss) by equity method (Income statement) 676 337 366 [1]
Dividends (519) (654) (399)
Ending balance 5,107 5,106 5,415
Other (193) (6) 13
Additions / acquisitions 37 14 118
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)     37
Disposals     (120)
Itaocara Overdraft Liability [Member]      
IfrsStatementLineItems [Line Items]      
Gain (loss) by equity method (Income statement) 7    
Additions / acquisitions 14    
Beginning balance (21)    
Ending balance (21)  
M E S A Loss Provisions [Member]      
IfrsStatementLineItems [Line Items]      
Gain (loss) by equity method (Income statement) [8] 162    
Beginning balance [8] (162)    
Ending balance [8] (162)  
Madeira Energia 1 [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 209 167
Gain (loss) by equity method (Income statement)   (209) 42 [1]
Ending balance   209
Ativas Data Center [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 16 17 16
Gain (loss) by equity method (Income statement)   (1) 1 [1]
Ending balance   16 17
Axxiom Solucoes Tecnologicas [Member]      
IfrsStatementLineItems [Line Items]      
Beginning balance 4 4 [2] 13 [2]
Gain (loss) by equity method (Income statement)   (2) (9) [1],[2]
Ending balance   4 4 [2]
Additions / acquisitions   2  
Itaocara Equity Deficit [Member]      
IfrsStatementLineItems [Line Items]      
Gain (loss) by equity method (Income statement)   7 [9] (9) [1],[10]
Additions / acquisitions   42 [9] 1 [10]
Beginning balance (21) [9] (30) [9],[10] (22) [10]
Ending balance [9]   (21) (30) [10]
Losses on investments [9]   (40)  
Madeira Energia Provisions To Losses [Member]      
IfrsStatementLineItems [Line Items]      
Gain (loss) by equity method (Income statement) [11]   (162)  
Beginning balance [11] R$ (162)  
Ending balance [11]   (162)
Companhia de transmissao centroeste de minas [member]      
IfrsStatementLineItems [Line Items]      
Beginning balance   24
Gain (loss) by equity method (Income statement) [1]    
Ending balance    
Other     14
Additions / acquisitions     45
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition)     37
Disposals     R$ (120)
[1] Includes bargain purchase related to the acquisition of the joint-controlled entities UFV Corinto, UFV Manga, UFV Lagoa Grande, UFV Lontra, UFV Mato Verde and UFV Porteirinha II, in the amount of R$7.
[2] With the cessation of control of Light, the remaining equity interest in these investees was recognized as an investment in affiliates or jointly controlled subsidiaries, and measured by the equity method, in accordance with IFRS 10. More details see Notes 1 and 32.
[3] Indirect participation in the Santo Antônio Plant through these investees.
[4] On September 12, 2022, AGPar made the payment associated with the settlement arising from Arbitral Award CCBC-86/2016 to the Melbourne Fund. Thereafter, the Company recognized the receivable against income. Further details are provided throughout this note.
[5] Indirect participation in Belo Monte Dam through these investees.
[6] On May 23, 2022, the reduction of capital stock of these UFVs was approved by means of an Extraordinary General Assembly.
[7] Includes the amount of R$2 of the acquisition of the jointly controlled subsidiary UFV Brasilândia.
[8] In June 2022, the provision related to the Company's contractual obligations assumed with the investee and the other shareholders was reversed. Further details are disclosed in this note.
[9] On December 1, 2021, CEMIG GT injected capital into UHE Itaocara S.A., in the amount of R$40. This amount is proportional to its shareholding interest in the investee and was recognized under Other expenses in the Company’s income statement. Further, R$1 was injected to cover the expenses specified in the 2021 budget of the investee.
[10] On December 31, 2019, the investee had negative shareholders’ equity. Thus, after reducing the accounting book value of its interest to zero, the Company recognized the provision for losses on investments, in the amount of R$22, resulting from contractual obligations assumed with the subsidiary and the other shareholders.
[11] A loss was recognized for extension of the contractual obligations which the Company had assumed to the investee and the other shareholders. On December 31, 2021 this amount was R$162.