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Schedule of cemig is provider of surety or guarantee of loans, financings and debentures of related parties (Details)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
BRL (R$)
IfrsStatementLineItems [Line Items]  
Financing and debenture of related party R$ 4,898
Norte Energia [Member]  
IfrsStatementLineItems [Line Items]  
Description of relationship Jointly controlled
Description of type Surety
Description of objective Financing
Financing and debenture of related party R$ 2,543
Description of maturity 2042
Norte Energia 1 [Member]  
IfrsStatementLineItems [Line Items]  
Description of relationship Jointly controlled
Description of type Counter-guarantee
Description of objective Financing
Financing and debenture of related party R$ 684
Description of maturity 2042
Santo Antonio Energia S A [Member]  
IfrsStatementLineItems [Line Items]  
Description of relationship Affiliated
Description of type Surety
Description of objective Debentures
Financing and debenture of related party R$ 491
Description of maturity 2037
Santo Antonio Energia S A 1 [Member]  
IfrsStatementLineItems [Line Items]  
Description of relationship Affiliated
Description of type Guarantee
Description of objective Financing
Financing and debenture of related party R$ 1,105
Description of maturity 2034
Norte Energia 2 [Member]  
IfrsStatementLineItems [Line Items]  
Description of relationship Jointly controlled
Description of type Surety
Description of objective Debentures
Financing and debenture of related party R$ 75
Description of maturity 2030