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Financial assets and liabilities - Summary of Credit Risk Rating (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of external credit grades [line items]    
Credit rating R$ 25,354,053 R$ 25,487,289
AAA credit rating [member]    
Disclosure of external credit grades [line items]    
Credit rating 23,080,390 20,878,272
AA credit rating [member]    
Disclosure of external credit grades [line items]    
Credit rating 2,239,266 3,991,846
BBB    
Disclosure of external credit grades [line items]    
Credit rating R$ 34,397 R$ 617,171