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SHORT-TERM DEBT AND LONG-TERM DEBT - Amortization schedules (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Amortization schedules of long-term loans and financing    
Long-term debt R$ 13,188,891 R$ 11,594,612
2021    
Amortization schedules of long-term loans and financing    
Long-term debt   1,221,361
2022    
Amortization schedules of long-term loans and financing    
Long-term debt 5,210 105,137
2023    
Amortization schedules of long-term loans and financing    
Long-term debt 2,108,324 1,243,774
2024    
Amortization schedules of long-term loans and financing    
Long-term debt 1,813,225 1,531,163
2025    
Amortization schedules of long-term loans and financing    
Long-term debt 682,422 1,642,664
2026 on    
Amortization schedules of long-term loans and financing    
Long-term debt R$ 8,579,710 R$ 5,850,513