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Loans, financing, debentures and hedge derivative financial instruments - Summary of Changes in Loans, Debentures and Finance Leases (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Loans debentures and finance leases details 1 [abstract] |  |
Loans, debentures and finance leases, beginning | R$ 14,362,737 | R$ 15,116,139
New loans and debentures with cash effect | 3,591,624 | 2,105,737
Interest accrued | 757,161 | 845,844
Principal payment | (2,795,002) | (2,644,704)
Interest payment | (740,853) | (1,469,780)
Monetary and exchange rate variation | 2,048,688 | 296,441
Change in fair value | 34,702 | 113,060
Loans, debentures and finance leases, ending | R$ 17,259,057 | R$ 14,362,737

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