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Hedge accounting (Details 3) - BRL (R$)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Nominal Value R$ 273,280,000,000 R$ 148,125,000,000  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (34,000,000) 699,000,000 R$ (3,557,000,000)
Gain (loss) on hedge ineffectiveness recognised in profit or loss (160,000,000) (19,000,000)  
Hedging instrument, assets 4,556,000,000 7,061,000,000  
Hedging instrument, liabilities 1,965,000,000 3,748,000,000  
Nominal Value   15,924,000,000  
Hedges of net investment in foreign operations [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 9,933,000,000    
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectivenes (14,996,000,000) (14,720,000,000)  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (14,836,000,000) (14,701,000,000)  
DDI futures contracts [Member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 1,673,000,000    
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectivenes (5,751,000,000) (3,252,000,000)  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (5,710,000,000) (3,241,000,000)  
Gain (loss) on hedge ineffectiveness recognised in profit or loss (41,000,000) (11,000,000)  
Hedging instrument, assets   286,000,000  
Nominal Value   2,126,000,000  
Non deliverable forward contract [Member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 5,186,000,000    
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectivenes (2,521,000,000) (3,534,000,000)  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (2,411,000,000) (3,529,000,000)  
Gain (loss) on hedge ineffectiveness recognised in profit or loss (110,000,000) (5,000,000)  
Hedging instrument, assets 176,000,000 209,000,000  
Hedging instrument, liabilities 126,000,000 95,000,000  
Nominal Value   8,036,000,000  
Financial assets held for hedging[Member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 3,074,000,000    
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectivenes (6,724,000,000) (7,934,000,000)  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (6,715,000,000) (7,931,000,000)  
Gain (loss) on hedge ineffectiveness recognised in profit or loss (9,000,000) (3,000,000)  
Hedging instrument, assets 4,380,000,000 6,566,000,000  
Hedging instrument, liabilities R$ 1,839,000,000 3,653,000,000  
Nominal Value   R$ 5,762,000,000