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TAX, CIVIL AND LABOR CLAIMS AND CONTINGENT ASSETS - Contingent Assets (Details)
R$ in Millions
 3 Months Ended 12 Months Ended
Dec. 30, 2020
BRL (R$)
Dec. 22, 2020
BRL (R$)
Jul. 03, 2020
BRL (R$)
Jun. 30, 2020
BRL (R$)
Dec. 31, 2020
BRL (R$)
kW
TAX, CIVIL AND LABOR CLAIMS AND CONTINGENT ASSETS          
Minimum industrial consumers monthly electricity consumption limit (in Kilo watt hour) | kW         2,000
Maximum period to return the compulsory loan to taxpayers         20 years
Claims receivable from monetary correction of principal, interest, moratory and others due to compulsory loans         R$ 113.0
Gain on settlement of litigation, net of expenses incurred       R$ 436.0  
Amounts raised R$ 43.6 R$ 39.7 R$ 206.0    
Amount of other pending lawsuits         R$ 1,350.0