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INTANGIBLE - Changes in intangible assets with determined useful life (Details) - BRL (R$)
R$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Intangible assets with determined useful life    
Beginning balance R$ 8,741,949 R$ 9,649,789
Additions 18,143 2,307
Write-offs (125)  
Amortization (485,985) (980,385)
Transfers and others 83,657 70,238
Balance at the end of the year R$ 8,357,639 R$ 8,741,949