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Loans, financing, debentures and hedge derivative financial instruments - Summary of Subsidiary's Loan Maturity (Detail) - 12 months ended Dec. 31, 2020 R$ in Thousands, $ in Thousands | BRL (R$) | USD ($) | USD ($)
--- | --- | --- | ---
Summary of loans debentures and finance leases [line items] |  |  |
Loan maturity, Banco de Brasil | R$ 407,420 |  |
Debentures | 6,544,116 |  |
Charges [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Debentures | 205,533 |  |
Maturity in May 2021 [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Loan maturity, Banco de Brasil | 204,328 |  |
Maturity in May 2022 [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Loan maturity, Banco de Brasil | 203,092 |  |
Maturity in May 2021 [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Debentures | 166,670 |  |
Maturity in July 2021 [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Debentures | 750,000 |  |
Maturity in April 2022 [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Debentures | 660,139 |  |
Maturity in July 2022 [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Debentures | 750,000 |  |
Maturity In October 2022 [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Debentures | 730,384 |  |
Maturity In March 2023 [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Debentures | 1,725,336 |  |
Maturity In December 2023 [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Debentures | 660,000 |  |
Maturity In April 2024 [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Debentures | 352,361 |  |
Maturity In October 2024 [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Debentures | 213,693 |  |
Maturity In November 2024 [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Debentures | 90,000 |  |
Maturity In December 2025 [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Debentures | R$ 240,000 |  |
Oxiteno USA LLC [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Borrowings, interest rate basis | LIBOR + 1.4% | LIBOR + 1.4% |
Borrowings | R$ 312,200 |  | $ 60,003
Loans paid off in advance | $ |  | $ 70,000 |
Oxiteno USA LLC [member] | Charges [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Borrowings | 15 |  | 3
Oxiteno USA LLC [member] | Mature in March 2021 [member] |  |  |
Summary of loans debentures and finance leases [line items] |  |  |
Borrowings | R$ 312,185 |  | $ 60,000

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