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RELATED PARTY TRANSACTIONS (Details 2)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
BRL (R$)
IfrsStatementLineItems [Line Items]  
Related party transaction amount R$ 4,208
Norte energia s.a. [member]  
IfrsStatementLineItems [Line Items]  
Related party Norte Energia (NESA) [1]
Relationship Affiliated [1]
Type Surety [1]
Objective Financing [1]
Related party transaction amount R$ 2,615 [1]
Maturity 2042 [1]
Norte Energia S.A one [member]  
IfrsStatementLineItems [Line Items]  
Related party Norte Energia (NESA) / Light
Relationship Affiliated [2]
Type Counter-guarantee [2]
Objective Financing [2]
Related party transaction amount R$ 684 [2]
Maturity 2042 [2]
Santo Antnio Energia S.A. [member]  
IfrsStatementLineItems [Line Items]  
Related party Santo Antônio Energia S.A.
Relationship Jointly controlled entity [3]
Type Surety [3]
Objective Debentures [3]
Related party transaction amount R$ 242 [3]
Maturity 2037 [3]
Santo Antnio Energia S.A. One [member]  
IfrsStatementLineItems [Line Items]  
Related party Santo Antônio Energia S.A.
Relationship Jointly controlled entity
Type Guarantee
Objective Financing
Related party transaction amount R$ 588
Maturity 2034
Norte Energia S A Two [Member]  
IfrsStatementLineItems [Line Items]  
Related party Norte Energia (NESA)
Relationship Affiliated
Type Surety
Objective Debentures
Related party transaction amount R$ 79
Maturity 2030
[1] Related to Norte Energia loans.
[2] Counter-guarantee to Light, related to execution of guarantees of the Norte Energia loans.
[3] Corporate guarantee given by CEMIG to Saesa.