XML 225 R197.htm IDEA: XBRL DOCUMENT v3.21.1
Risks and Financial Instruments - Value of gains (losses) recognized (Detail) - BRL (R$)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Profit or loss [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments R$ (694,877,000) R$ (37,800,000) R$ 56,163,000
Profit or loss [member] | Exchange rate derivates receivable in U.S. dollars and commodities [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments 497,210,000 230,000,000  
Profit or loss [member] | Exchange Rate Swap Receivable In U S Dollars [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments     181,544,000
Profit or loss [member] | Exchange rate swap payable in us dollars [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments (330,999,000) (1,667,000) (3,903)
Profit or loss [member] | Interest rate swaps brl [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments 58,131,000 (4,035,000) 12,474,000
Profit or loss [member] | Nonderivative Financial Instruments [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments (919,219,000) (262,098,000) (133,951,000)
Equity [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments (737,391,000) (349,039,000) (289,448,000)
Equity [member] | Exchange rate derivates receivable in U.S. dollars and commodities [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments  
Equity [member] | Exchange Rate Swap Receivable In U S Dollars [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments    
Equity [member] | Exchange rate swap payable in us dollars [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments 80,000 (80,000) 176,000
Equity [member] | Interest rate swaps brl [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments
Equity [member] | Nonderivative Financial Instruments [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments R$ (737,471,000) R$ (348,959,000) R$ (284,624,000)