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Financial Instruments and Risk Management - Schedule of Changes in Value of Options (Parenthetical) (Details)
R$ in Millions
 12 Months Ended
Dec. 31, 2023
BRL (R$)
Put option - SAAG [member]  
Disclosure of detailed information about financial instruments [line items]  
Aggregate value of related assets R$ 50 [1]
[1] With the acquisition of the share units then held by the Funds in the Investment Structure, Cemig GT became the holder of the related assets, which have aggregate value of R$50. This amount is recognized in Other assets in the Statement of financial position.