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Financial assets and liabilities - Summary of Credit Risk (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of credit risk exposure [line items]    
Exposure to risk R$ 29,356,555 R$ 28,531,175
Cash and cash equivalents [member]    
Disclosure of credit risk exposure [line items]    
Exposure to risk 16,174,130 13,642,918
Trade receivables [member]    
Disclosure of credit risk exposure [line items]    
Exposure to risk 2,745,853 2,033,441
Marketable securities [member]    
Disclosure of credit risk exposure [line items]    
Exposure to risk 4,388,007 3,669,109
Restricted cash [member]    
Disclosure of credit risk exposure [line items]    
Exposure to risk 58,990
Derivative financial instruments [member]    
Disclosure of credit risk exposure [line items]    
Exposure to risk 4,732,926 8,140,700
Receivables from related parties [member]    
Disclosure of credit risk exposure [line items]    
Exposure to risk 416,491 929,690
Dividend receivable [member]    
Disclosure of credit risk exposure [line items]    
Exposure to risk 519,965 80,755
Restricted cash [member]    
Disclosure of credit risk exposure [line items]    
Exposure to risk R$ 320,193 R$ 34,562