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Financial assets and liabilities - Summary of Financial Risks and Financial Performance (Detail) | 12 Months Ended
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Dec. 31, 2021
Disclosure of financial assets [line items] |
Measurement | Stressed scenarios (positive and negative effects before tax effects) were defined based on changes of a 25% and 50% to the U.S. dollar and Euro exchange rate used in the probable scenario.
Currency risk [member] | Cash flow forecasting [member] |
Disclosure of financial assets [line items] |
Exposure | (i) Future commercial transactions.
Measurement | (i) Cash flow forecasting
Management | Foreign currency.
Currency risk [member] | Sensitivity analysis [member] |
Disclosure of financial assets [line items] |
Exposure | (ii) Recognized financial assets and liabilities not denominated in Brazilian reais.
Measurement | (ii) Sensitivity analysis
Interest rate risk [member] | Sensitivity analysis [member] |
Disclosure of financial assets [line items] |
Exposure | Cash and cash equivalents, marketable securities, loans, borrowings and debentures, leases and derivatives.
Measurement | (i) Sensitivity analysis
Management | Interest rate Swap.
Market risk - prices [member] |
Disclosure of financial assets [line items] |
Exposure | (i) Future commercial transactions.
Management | Future electric energy price (purchase and sale).
Market risk - prices [member] | Cash flow forecasting [member] |
Disclosure of financial assets [line items] |
Exposure | (i) Future commercial transactions.
Measurement | (i) Cash flow forecasting
Management | Future electric energy price (purchase and sale).
Market risk - prices [member] | Sensitivity analysis [member] |
Disclosure of financial assets [line items] |
Measurement | (ii) Sensitivity analysis
Credit risk [member] |
Disclosure of financial assets [line items] |
Exposure | Cash and cash equivalents, marketable securities, restricted cash, trade receivables, derivatives, receivables from related parties and dividends, and investment property
Measurement | (i) Aging analysis
Management | Diversification of bank deposits, credit limits and letters of credit.
Credit risk [member] | Aging analysis [member] |
Disclosure of financial assets [line items] |
Measurement | (ii) Credit ratings
Liquidity risk [member] | A Credit Rating [member] |
Disclosure of financial assets [line items] |
Exposure | Loans, borrowings and debentures, trade payables, other financial liabilities, tax installments, leases, derivatives, payables to related parties and dividends.
Measurement | (i) Rolling cash flow forecasts
Management | Availability of committed credit lines and borrowing facilities.

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