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33. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 4) - BRL (R$)
R$ in Millions
 1 Months Ended 12 Months Ended
Jul. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 21, 2019
Derivative Financial Instruments [line items]        
Cemig's obligation 125.52% of the CDI rate 150.49% of the CDI    
Unrealized gain/loss Carrying amount   R$ 922 R$ 712  
Unrealized gain/loss fair value   R$ 1,691 R$ 813  
Forty Nine Percent of Certificados de Deposito Inter bancario [member]        
Derivative Financial Instruments [line items]        
Cemig's right   US$ exchange variation + Rate (9,25% p.y.) US$ exchange variation + Rate (9,25% p.y.) [1]  
Cemig's obligation   Local currency + R$ 150.49% of CDI Local currency + R$ 150.49% of CDI [1]  
Maturity period   Interest: Half-yearly Principal: Dec. 2024 Interest: Half-yearly Principal: Dec. 2024  
Notional amount [2]       R$ 1,000
Unrealized gain/loss Carrying amount   R$ 814 R$ 1,000  
Unrealized gain/loss fair value   R$ 1,235 R$ 627  
Fifty Two Percent of Certificados de Deposito Inter bancario [member]        
Derivative Financial Instruments [line items]        
Cemig's right   US$ exchange variation + Rate (9,25% a.a.) US$ exchange variation + Rate (9,25% a.a.) [1]  
Cemig's obligation   Local currency + R$125.52% of CDI Local currency + R$125.52% of CDI [1]  
Maturity period   Interest: Half-yearly Principal: Dec. 2024 Interest: Half-yearly Principal: Dec. 2024  
Notional amount [2]   R$ 500    
Unrealized gain/loss Carrying amount   108 R$ 33  
Unrealized gain/loss fair value   R$ 456 R$ 186  
[1] For the US$1 billion Eurobond issued on December 2017: (i) for the principal, a call spread was contracted, with floor at R$ 3.25/US$ and ceiling at R$ 5.00/US$; and (ii) a swap was contracted for the total interest, for a coupon of 9.25% p.a. at an average rate equivalent to 150.49% of the CDI. For the additional US$500 issuance of the same Eurobond issued on July 2018: (1) a call spread was contracted for the principal, with floor at R$ 3.85/US$ and ceiling at R$ 5.00/US$; and (2) a swap was contracted for the interest, resulting in a coupon of 9.25% p.a., with an average rate equivalent to 125.52% of the CDI rate.
[2] In millions of US$.