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30. RELATED PARTY TRANSACTIONS (Details 2)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Disclosure of transactions between related parties [line items]  
Related party transaction amount R$ 4,820
Norte energia s.a. [member]  
Disclosure of transactions between related parties [line items]  
Related party Norte Energia (NESA) [1]
Relationship Affiliated [1]
Type Surety [1]
Objective Financing [1]
Related party transaction amount R$ 2,601 [1]
Maturity 2042 [1]
Light [member]  
Disclosure of transactions between related parties [line items]  
Related party Light
Relationship Affiliated
Type Counter-guarantee
Objective Financing
Related party transaction amount R$ 684
Maturity 2042
Santo Antnio Energia S.A. [member]  
Disclosure of transactions between related parties [line items]  
Related party Santo Antônio Energia (SAESA) [2]
Relationship Jointly-controlled [2]
Type Surety [2]
Objective Debentures [2]
Related party transaction amount R$ 445 [2]
Maturity 2037 [2]
Santo Antnio Energia S.A. One [member]  
Disclosure of transactions between related parties [line items]  
Related party Santo Antônio Energia (SAESA)
Relationship Jointly-controlled
Type Guarantee
Objective Financing
Related party transaction amount R$ 1,023
Maturity 2034
Norte Energia S.A one [member]  
Disclosure of transactions between related parties [line items]  
Related party Norte Energia (NESA)
Relationship Affiliated
Type Surety
Objective Debentures
Related party transaction amount R$ 67
Maturity 2030
[1] Related to execution of guarantees of the Norte Energia financing.
[2] Corporate guarantee given by Cemig to Saesa.