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18. INVESTMENTS (Details Narrative) - BRL (R$)
R$ / shares in Units, R$ in Millions
 12 Months Ended
Jan. 23, 2020
Dec. 27, 2019
Jan. 28, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2014
Oct. 25, 2019
Oct. 15, 2019
Aug. 07, 2019
Nov. 30, 2018
Oct. 31, 2018
Apr. 23, 2018
Disclosure of detailed information about investment property [line items]                          
Provision for losses on investments       R$ 22                
Investment Write Downs       183                  
Net income (loss) for the year       3,128 1,742 R$ 1,002              
Accumulated loss       (2,993) R$ (1,938)                
Negative net working capital       R$ 3,309                  
Number of shares issued       1,258,841,654 1,458,752,601 1,258,841,654             199,910,947
Share price       R$ 5.00                 R$ 5.00
Increase in the share capitaL                   R$ 2,600      
Consideration paid for the acquisition       R$ 45                  
Equity deficit       R$ 8,750 R$ 6,362 R$ 5,729              
Parajuru, Volta do Rio and Morgado [member]                          
Disclosure of detailed information about investment property [line items]                          
Percentage Of Minority Interest       49.00%                  
Light [Member]                          
Disclosure of detailed information about investment property [line items]                          
Interest acquisition percentage                     47.25%    
Light SA [member] | Cemig GT [Member]                          
Disclosure of detailed information about investment property [line items]                          
Interest acquisition percentage         49.99%                
Renova [Member] | Cemig GT [Member]                          
Disclosure of detailed information about investment property [line items]                          
Advance against future capital increase               R$ 5          
Mesa [Member] | Cemig GT [Member]                          
Disclosure of detailed information about investment property [line items]                          
Subscribed capital increases                       R$ 25  
FIP Melbourne [Member] | Cemig GT [Member]                          
Disclosure of detailed information about investment property [line items]                          
Subscribed capital increases                       R$ 26  
Eletrobras [Member] | Centroeste [Member]                          
Disclosure of detailed information about investment property [line items]                          
Interest acquisition percentage 49.00%                        
Percentage of holding by investee 100.00%                        
Belo Monte Plant Through Amaznia Energia S A A And Alianca Norte [Member]                          
Disclosure of detailed information about investment property [line items]                          
Loss contingencies       R$ 1,962 R$ 1,643                
Renova Energia SA [Member]                          
Disclosure of detailed information about investment property [line items]                          
Current liabilities in excess of consolidated current assets       2,907 458                
Net income (loss) for the year       688 (856)                
Accumulated loss       4,010 3,051                
Equity deficit       1,091 76                
Effective assets       35                  
Impaired assets       142                  
Renova Energia SA [Member] | Preferred Shares [Member]                          
Disclosure of detailed information about investment property [line items]                          
Interest acquisition percentage                 17.17%        
Number of shares issued                 98        
Cemig GT [Member]                          
Disclosure of detailed information about investment property [line items]                          
Investment Write Downs             R$ 678            
Madeira Energia SA Mesa and FIP Melbourne [member]                          
Disclosure of detailed information about investment property [line items]                          
Loss contingencies       951 1,743                
Current liabilities in excess of consolidated current assets       427 663                
Madeira Energia (Santo Antonio plant) [Member]                          
Disclosure of detailed information about investment property [line items]                          
Net income (loss) for the year       R$ (951) (1,743) (1,091)              
Nominal WACC discount rate       9.59%                  
Baguari Energia [Member]                          
Disclosure of detailed information about investment property [line items]                          
Net income (loss) for the year       R$ 32 R$ 41 22              
Belo Monte Plant Through Amaznia Energia SAA and Aliana Norte [member]                          
Disclosure of detailed information about investment property [line items]                          
Percentage of indirect equity interest         11.69%                
TAESA [Member]                          
Disclosure of detailed information about investment property [line items]                          
Net income (loss) for the year         R$ 1,071                
Number of unit sold       34,000,000                  
Sold price (in dollar per share)       R$ 21.1                  
Percentage of share capital       31.54%                  
Percentage of reduced share capital       21.68%                  
Alianca Norte Energia Participacoes S A [Member]                          
Disclosure of detailed information about investment property [line items]                          
Net income (loss) for the year         94                
Retiro Baixo Energtica SA [Member]                          
Disclosure of detailed information about investment property [line items]                          
Net income (loss) for the year         26                
Renova [Member]                          
Disclosure of detailed information about investment property [line items]                          
Net income (loss) for the year       R$ (1,014) (856) (1,140)              
Renova [Member] | Loan Agreements [Member]                          
Disclosure of detailed information about investment property [line items]                          
Loan granted   R$ 17 R$ 20 37                  
Alianca Geracao [Member]                          
Disclosure of detailed information about investment property [line items]                          
Net income (loss) for the year       229 198 215              
Amazonia Energia (Belo Monte plant) [Member]                          
Disclosure of detailed information about investment property [line items]                          
Net income (loss) for the year       R$ 20 103 R$ 1              
Ativas Data Center [Member]                          
Disclosure of detailed information about investment property [line items]                          
Net income (loss) for the year         (21)                
Hidreletrica Cachoeirao SA [member]                          
Disclosure of detailed information about investment property [line items]                          
Net income (loss) for the year         20                
Hidreletrica Pipoca [Member]                          
Disclosure of detailed information about investment property [line items]                          
Net income (loss) for the year         12                
Centroeste [Member]                          
Disclosure of detailed information about investment property [line items]                          
Net income (loss) for the year         R$ 10                
Interest acquisition percentage       51.00%                  
Espra [Member]                          
Disclosure of detailed information about investment property [line items]                          
Estimated due consideration for income tax and social contribution tax       R$ 89