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Loans, financing, debentures and hedge derivative financial instruments - Summary of Foreign Loan Maturity (Detail) - 12 months ended Dec. 31, 2020 - IPP [member] - Foreign loans [member] R$ in Thousands, $ in Thousands | BRL (R$) | USD ($)
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Summary of loans debentures and finance leases [line items] |  |
Loan maturity, amount | R$ 1,308,928 | $ 251,877
Cost in percentage of DI | 104.10% | 104.10%
Charges [member] |  |
Summary of loans debentures and finance leases [line items] |  |
Loan maturity, amount | R$ 87,703 | $ 16,877
Foreign loan one [member] |  |
Summary of loans debentures and finance leases [line items] |  |
Loan maturity, date | Jul/2021 | Jul/2021
Loan maturity, amount | R$ 311,802 | $ 60,000
Cost in percentage of DI | 101.80% | 101.80%
Foreign loan two [member] |  |
Summary of loans debentures and finance leases [line items] |  |
Loan maturity, date | Jun/2022 | Jun/2022
Loan maturity, amount | R$ 259,835 | $ 50,000
Cost in percentage of DI | 105.00% | 105.00%
Foreign loan three [member] |  |
Summary of loans debentures and finance leases [line items] |  |
Loan maturity, date | Sep/2023 | Sep/2023
Loan maturity, amount | R$ 311,802 | $ 60,000
Cost in percentage of DI | 105.00% | 105.00%
Foreign loan four [member] |  |
Summary of loans debentures and finance leases [line items] |  |
Loan maturity, date | Sep/2023 | Sep/2023
Loan maturity, amount | R$ 337,786 | $ 65,000
Cost in percentage of DI | 104.80% | 104.80%

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