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INCOME TAX AND SOCIAL CONTRIBUTION - Reconciliation of expense with income tax and social contributions (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of expense with income tax and social contribution      
Operating Profit Before Taxes R$ 1,396,363 R$ 3,347,210 R$ 11,059,505
IRPJ and CSLL calculated at nominal rates (474,763) (1,138,051) (3,760,232)
Effects of additions and exclusions:      
Deferred taxes not recognized/written off 93,800 (2,885,746) (9,336,783)
Exchange Rate Variation 48,822 40,131 (136,397)
Equity pickup method 515,523 805,724 722,018
Provisions (710,044) 1,727,714 5,721,293
Financial revenue - Contract Asset 34,317 272,872 689,880
Revenue from Dividends/JCP   (314,694) 48,435
Constitution/Reversion of Tax Credits 2,343,448 (376,652) (887,365)
Tax incentives 290,574 152,059 732,541
Donations (3,046) (20,617) (17,830)
Renegotiation of hydrological risk (36,735) 395,666 1,317,411
Other permanent additions and exclusions 896,602 645,981 (353,613)
Total income tax expense R$ 2,998,498 (695,613) R$ (5,260,642)
Tax incentive percentage 75.00%    
Tax incentives - SUDENE and SUDAM R$ 313,368 R$ 117,851