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16. CONCESSION FINANCIAL AND SECTOR ASSETS AND LIABILITIES (Details 2)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
BRL (R$)
MW
Dec. 31, 2018
BRL (R$)
Dec. 31, 2017
BRL (R$)
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Installed capacity (MW) | MW 3,601.70    
Net balance of assets based on historical cost R$ 204    
Net balance of assets based on fair value (replacement cost) 816 R$ 816  
Amounts received R$ (250) R$ (250) R$ (234)
Cemig PCH Marmelos [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date 2015-07    
Installed capacity (MW) | MW 4.00    
Net balance of assets based on historical cost R$ 1    
Net balance of assets based on fair value (replacement cost) R$ 4    
Cemig PCH Paciencia [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date 2015-07    
Installed capacity (MW) | MW 4.08    
Net balance of assets based on historical cost R$ 1    
Net balance of assets based on fair value (replacement cost) R$ 4    
Cemig PCH Cajuru [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date 2015-07    
Installed capacity (MW) | MW 7.20    
Net balance of assets based on historical cost R$ 4    
Net balance of assets based on fair value (replacement cost) R$ 4    
Cemig PCH Martins [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date 2015-07    
Installed capacity (MW) | MW 7.70    
Net balance of assets based on historical cost R$ 2    
Net balance of assets based on fair value (replacement cost) R$ 4    
Cemig PCH Joasal [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date 2015-07    
Installed capacity (MW) | MW 8.40    
Net balance of assets based on historical cost R$ 1    
Net balance of assets based on fair value (replacement cost) R$ 8    
Cemig PCH Tronqueiras [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date 2015-07    
Installed capacity (MW) | MW 8.50    
Net balance of assets based on historical cost R$ 2    
Net balance of assets based on fair value (replacement cost) R$ 12    
Cemig PCH Dona Rita [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date 2013-09    
Installed capacity (MW) | MW 2.41    
Net balance of assets based on historical cost R$ 1    
Net balance of assets based on fair value (replacement cost) R$ 1    
Cemig PCH Peti [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date 2015-07    
Installed capacity (MW) | MW 9.40    
Net balance of assets based on historical cost R$ 1    
Net balance of assets based on fair value (replacement cost) R$ 8    
Cemig PCH Gafanhoto [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date 2015-07    
Installed capacity (MW) | MW 14.00    
Net balance of assets based on historical cost R$ 1    
Net balance of assets based on fair value (replacement cost) R$ 10    
Cemig PCH Piau [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date 2015-07    
Installed capacity (MW) | MW 18.01    
Net balance of assets based on historical cost R$ 2    
Net balance of assets based on fair value (replacement cost) R$ 9    
Usina Hidreletrica Sao Simao [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date [1] 2015-01    
Installed capacity (MW) | MW [1] 1.710    
Net balance of assets based on historical cost [1] R$ 2    
Net balance of assets based on fair value (replacement cost) [1] R$ 3    
Usina Hidreletrica Jaguara [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date [1] 2013-08    
Installed capacity (MW) | MW [1] 424.00    
Net balance of assets based on historical cost [1] R$ 40    
Net balance of assets based on fair value (replacement cost) [1] R$ 174    
Usina Hidreletrica Miranda [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date [1] 2016-12    
Installed capacity (MW) | MW [1] 408.00    
Net balance of assets based on historical cost [1] R$ 27    
Net balance of assets based on fair value (replacement cost) [1] R$ 23    
Usina Hidreletrica Volta Grande [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date 2017-02    
Installed capacity (MW) | MW 380.00    
Net balance of assets based on historical cost R$ 26    
Net balance of assets based on fair value (replacement cost) R$ 70    
Usina Hidreletrica Camargos [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date 2015-07    
Installed capacity (MW) | MW 46.00    
Net balance of assets based on historical cost R$ 8    
Net balance of assets based on fair value (replacement cost) R$ 23    
Usina Hidreletrica Itutinga [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date 2015-07    
Installed capacity (MW) | MW 52.00    
Net balance of assets based on historical cost R$ 3    
Net balance of assets based on fair value (replacement cost) R$ 7    
Usina Hidreletrica Salto Grande [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date 2015-07    
Installed capacity (MW) | MW 102.00    
Net balance of assets based on historical cost R$ 11    
Net balance of assets based on fair value (replacement cost) R$ 39    
Usina Hidreletrica Tres Marias [Member]      
Disclosure Of Financial Assets and Liabilities Of The Concession [line items]      
Concession expiration date 2015-07    
Installed capacity (MW) | MW 396.00    
Net balance of assets based on historical cost R$ 71    
Net balance of assets based on fair value (replacement cost) R$ 413    
[1] Investments made after the Jaguara, Sao Simao and Miranda plants came into operation, in the amounts of R$174, R$3 and R$23, respectively, are recorded as concession financial assets, and the determination of the final amounts to be paid to the Company is in a process of discussion with Aneel (the regulator). Company does not expect losses in realization of these amounts.