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Hedge accounting (Details 2) - BRL (R$)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income R$ (34,000,000) R$ 699,000,000 R$ (3,557,000,000)
Credit derivative, nominal amount 273,280,000,000 148,125,000,000  
Currency risk [member]      
IfrsStatementLineItems [Line Items]      
Hedged item, assets 8,983,000,000 11,325,000,000  
Hedged item, liabilities  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (14,836,000,000) (14,701,000,000)  
Gains (losses) on change in value of foreign currency basis spreads, net of tax (14,836,000,000) (14,701,000,000)  
Credit derivative, nominal amount 9,933,000,000 15,924,000,000  
Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness (14,996,000,000) (14,720,000,000)  
Hedges of net investment in foreign operations [member]      
IfrsStatementLineItems [Line Items]      
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (14,836,000,000) (14,701,000,000)  
Credit derivative, nominal amount 9,933,000,000    
Hedges of net investment in foreign operations [member] | Currency risk [member]      
IfrsStatementLineItems [Line Items]      
Hedged item, assets 8,983,000,000 11,325,000,000  
Hedged item, liabilities  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (14,836,000,000) (14,701,000,000)  
Gains (losses) on change in value of foreign currency basis spreads, net of tax (14,836,000,000) (14,701,000,000)  
Credit derivative, nominal amount 9,933,000,000 15,924,000,000  
Gain (loss) on change in fair value of hedged item used as basis for recognising hedge ineffectiveness R$ (14,996,000,000) R$ (14,720,000,000)