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32. RELATED PARTY TRANSACTIONS (Details 2)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Disclosure of transactions between related parties [line items]  
Related party transaction amount R$ 4,607
Santo Antnio Energia S.A. One [Member]  
Disclosure of transactions between related parties [line items]  
Related party Santo Antônio Energia (SAESA) [1]
Relationship Affiliated [1]
Type Surety [1]
Objective Guarantee [1]
Related party transaction amount R$ 939 [1]
Maturity 2034 [1]
Norte Energia S.A [Member]  
Disclosure of transactions between related parties [line items]  
Related party Norte Energia (NESA)
Relationship Affiliated
Type Surety
Objective Financing
Related party transaction amount R$ 2,555
Maturity 2042
Santo Antnio Energia S.A. [Member]  
Disclosure of transactions between related parties [line items]  
Related party Santo Ant?nio Energia (SAESA) (2) [1]
Relationship Affiliated [1]
Type Surety [1]
Objective Debentures [1]
Related party transaction amount R$ 424 [1]
Maturity 2037 [1]
Centroeste [Member]  
Disclosure of transactions between related parties [line items]  
Related party Centroeste
Relationship Jointly-controlled entity
Type Surety
Objective Financing
Related party transaction amount R$ 5
Maturity 2023
Light [Member]  
Disclosure of transactions between related parties [line items]  
Related party Light [2]
Relationship Affiliated [2]
Type Counter-guarantee [2]
Objective Financing [2]
Related party transaction amount R$ 684 [2]
Maturity 2042 [2]
[1] Corporate guarantee given by Cemig to Saesa.
[2] Related to execution of guarantees of the Norte Energia financing.