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Loans, financing, debentures and hedge derivative financial instruments - Summary of Transaction Costs (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]      
Transaction costs, beginning R$ 67,110 R$ 71,766 R$ 76,457
Incurred cost 40,953 20,065 19,134
Amortization (21,275) (24,721) (23,825)
Reclassification to liabilities held for sale [1] (4,204)    
Transaction costs, ending R$ 82,584 R$ 67,110 R$ 71,766
Debentures [member]      
Disclosure of detailed information about borrowings [line items]      
Effective rate of transaction costs 0.20% 0.20% 0.20%
Transaction costs, beginning R$ 28,348 R$ 41,406 R$ 56,376
Incurred cost 40,953 692
Amortization (14,811) (13,058) (15,662)
Reclassification to liabilities held for sale [1]    
Transaction costs, ending R$ 54,490 R$ 28,348 R$ 41,406
Notes in foreign market [member]      
Disclosure of detailed information about borrowings [line items]      
Effective rate of transaction costs 0.10% 0.10% 0.10%
Transaction costs, beginning R$ 37,112 R$ 28,114 R$ 13,881
Incurred cost 13,263 18,442
Amortization (4,890) (4,265) (4,209)
Reclassification to liabilities held for sale [1] (4,204)    
Transaction costs, ending 28,018 R$ 37,112 28,114
Notes [member]      
Disclosure of detailed information about borrowings [line items]      
Effective rate of transaction costs   0.50%  
Transaction costs, beginning 1,318  
Incurred cost 6,802  
Amortization (1,318) (5,484)  
Reclassification to liabilities held for sale [1]    
Transaction costs, ending R$ 1,318
Banco do Brasil [member]      
Disclosure of detailed information about borrowings [line items]      
Effective rate of transaction costs 0.10% 0.10% 0.20%
Transaction costs, beginning R$ 332 R$ 770 R$ 3,437
Incurred cost
Amortization (256) (438) (2,667)
Reclassification to liabilities held for sale [1]    
Transaction costs, ending 76 332 R$ 770
Foreign loans [member]      
Disclosure of detailed information about borrowings [line items]      
Effective rate of transaction costs    
Transaction costs, beginning 94 R$ 331
Incurred cost  
Amortization   (94) (237)
Transaction costs, ending   R$ 94
Othes [member]      
Disclosure of detailed information about borrowings [line items]      
Effective rate of transaction costs     0.20%
Transaction costs, beginning 1,382 R$ 2,432
Incurred cost  
Amortization   (1,382) (1,050)
Transaction costs, ending   R$ 1,382
[1] See Note 3.c.1.