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Provisions, contingent assets and contingent liabilities (Details 2) - Guarantees Of Contingencies Provisions And Legal Obligations [Member] - BRL (R$)
R$ in Millions
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Deposits in guarantee (Note 18a) R$ 13,001 R$ 12,264
Investments fund quotas 615 690
Surety 5,262 4,115
Insurance bond 19,256 18,771
Guarantee by government securities 292 242
Total 38,426 R$ 36,082
Civil [Member]    
IfrsStatementLineItems [Line Items]    
Deposits in guarantee (Note 18a) 1,761  
Investments fund quotas 416  
Surety 64  
Insurance bond 1,622  
Total 3,863  
Labour [Member]    
IfrsStatementLineItems [Line Items]    
Deposits in guarantee (Note 18a) 2,044  
Investments fund quotas 136  
Surety 52  
Insurance bond 1,461  
Total 3,693  
Tax [Member]    
IfrsStatementLineItems [Line Items]    
Deposits in guarantee (Note 18a) 9,196  
Investments fund quotas 63  
Surety 5,146  
Insurance bond 16,173  
Guarantee by government securities 292  
Total R$ 30,870