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Securities sold under repurchase agreements and interbank and institutional market funds (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements R$ 293,440 R$ 252,848
Assets Pledged as Collateral [member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements 90,819 94,980
Assets Pledged as Collateral [member] | Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements R$ 66,665 67,060
Assets Pledged as Collateral [member] | Government Securities [member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of securities sold under repurchase agreements 13.32%  
Assets Pledged as Collateral [member] | Government Securities [member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of securities sold under repurchase agreements 13.65%  
Assets Pledged as Collateral [member] | Corporate Securities [Member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements R$ 22,562 25,676
Assets Pledged as Collateral [member] | Corporate Securities [Member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of securities sold under repurchase agreements 45.00%  
Assets Pledged as Collateral [member] | Corporate Securities [Member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of securities sold under repurchase agreements 90.00%  
Assets Pledged as Collateral [member] | Own issue [member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements R$ 8 21
Assets Pledged as Collateral [member] | Own issue [member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of securities sold under repurchase agreements 12.80%  
Assets Pledged as Collateral [member] | Own issue [member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of securities sold under repurchase agreements 15.75%  
Assets Pledged as Collateral [member] | Foreign Securities [Member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements R$ 1,584 2,223
Assets Pledged as Collateral [member] | Foreign Securities [Member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of securities sold under repurchase agreements 60.00%  
Assets Pledged as Collateral [member] | Foreign Securities [Member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of securities sold under repurchase agreements 0.88%  
Assets Received as Collateral [member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements R$ 127,375 105,036
Assets Received as Collateral [member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of securities sold under repurchase agreements 13.65%  
Assets Received as Collateral [member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of securities sold under repurchase agreements 13.30%  
Right to sell or repledge collateral [member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements R$ 75,246 52,832
Right to sell or repledge collateral [member] | Top of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of securities sold under repurchase agreements 100.00%  
Right to sell or repledge collateral [member] | Bottom of range [member]    
IfrsStatementLineItems [Line Items]    
Percentage of securities sold under repurchase agreements 3.60%  
Current [member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements R$ 270,798 243,195
Current [member] | Assets Pledged as Collateral [member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements 90,700 94,899
Current [member] | Assets Pledged as Collateral [member] | Government Securities [member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements 66,665 67,060
Current [member] | Assets Pledged as Collateral [member] | Corporate Securities [Member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements 22,562 25,676
Current [member] | Assets Pledged as Collateral [member] | Own issue [member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements 2 1
Current [member] | Assets Pledged as Collateral [member] | Foreign Securities [Member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements 1,471 2,162
Current [member] | Assets Received as Collateral [member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements 127,375 105,036
Current [member] | Right to sell or repledge collateral [member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements 52,723 43,260
Non current [member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements 22,642 9,653
Non current [member] | Assets Pledged as Collateral [member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements 119 81
Non current [member] | Assets Pledged as Collateral [member] | Own issue [member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements 6 20
Non current [member] | Assets Pledged as Collateral [member] | Foreign Securities [Member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements 113 61
Non current [member] | Right to sell or repledge collateral [member]    
IfrsStatementLineItems [Line Items]    
Securities sold under repurchase agreements R$ 22,523 R$ 9,572