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32. ASSETS AS HELD FOR SALE AND DISCONTINUED OPERATIONS (Details 1) - Sale of retained investiment in light [member] - Light [member]
R$ in Millions
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Disclosure of assets and liabilities classified as held for sale [line items]  
Cemig's shares R$ 68,621,263
Sale price of the shares 20
Total 1,372
Estimated cost to sell (5) [1]
Fair value, less cost to sell 1,367
Non-current asset held for sale carrying amount (1,258)
Gains 109
IRPJ and CSLL (37) [2]
Gain after taxes R$ 72
[1] The estimated cost to sell includes financing, accounting and legal advices services.
[2] The adjustment in the tax calculation resulted in a positive effect of R$113.