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Schedule of assets and liabilities over the cost paid in the step acquisitions (Details) - Sale Of Retained Investiment In Light [Member] - Light [Member]
R$ in Millions
 12 Months Ended
Dec. 31, 2021
BRL (R$)
IfrsStatementLineItems [Line Items]  
Cemig’s shares R$ 68,621,263
Sale price of the shares – January 21, 2021 20
Total value 1,372
Estimated cost to sell (0.42%) (5) [1]
Fair value, less cost to sell on 01/22/2021 1,367
Non-current asset held for sale carrying amount in 12/31/2020 (1,258)
Gains 109
IRPJ and CSLL (37)
Gain after taxes R$ 72
[1] The estimated cost to sell includes financing, accounting and legal advices services.