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Hedge accounting (Details 1) - 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  
Hedging instrument, assets 4,556,000,000 7,061,000,000  
Hedging instrument, liabilities 1,965,000,000 3,748,000,000  
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)  
Currency risk [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 9,933,000,000 15,924,000,000  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (14,836,000,000) (14,701,000,000)  
Cash flow hedges [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 225,396,000,000 111,412,000,000  
Hedging instrument, assets 424,000,000 447,000,000  
Hedging instrument, liabilities 685,000,000 617,000,000  
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness (554,000,000) (946,000,000)  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (607,000,000) (942,000,000)  
Gain (loss) on hedge ineffectiveness recognised in profit or loss 53,000,000 (4,000,000)  
Reclassification adjustments on cash flow hedges, net of tax 379,000,000 (13,000,000)  
Interest rate futures [member] | Cash flow hedges [member] | Interest rate risk [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 206,586,000,000 87,311,000,000  
Hedging instrument, assets 31,000,000 58,000,000  
Hedging instrument, liabilities 27,000,000 24,000,000  
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness (653,000,000) (1,035,000,000)  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (706,000,000) (1,030,000,000)  
Gain (loss) on hedge ineffectiveness recognised in profit or loss 53,000,000 (5,000,000)  
Reclassification adjustments on cash flow hedges, net of tax   (13,000,000)  
Interest Rate Forward [Member] | Cash flow hedges [member] | Interest rate risk [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 10,037,000,000 16,830,000,000  
Hedging instrument, assets 136,000,000 118,000,000  
Hedging instrument, liabilities 646,000,000 593,000,000  
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness 11,000,000 (118,000,000)  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income 11,000,000 (118,000,000)  
Reclassification adjustments on cash flow hedges, net of tax 1,000,000    
Interest rate swap2 [Member] | Cash flow hedges [member] | Interest rate risk [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 8,071,000,000 3,763,000,000  
Hedging instrument, assets 201,000,000 19,000,000  
Hedging instrument, liabilities 11,000,000    
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness 85,000,000 22,000,000  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income 85,000,000 21,000,000  
Futures contract [member] | Cash flow hedges [member] | Interest rate risk [member]      
IfrsStatementLineItems [Line Items]      
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness   185,000,000  
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income   185,000,000  
Reclassification adjustments on cash flow hedges, net of tax 378,000,000    
Futures contract [member] | Cash flow hedges [member] | Currency risk [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 249,000,000 3,480,000,000  
Hedging instrument, assets 2,000,000 252,000,000  
Forward contract [member] | Cash flow hedges [member] | Interest rate risk [member]      
IfrsStatementLineItems [Line Items]      
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness 4,000,000    
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income 4,000,000    
Forward contract [member] | Cash flow hedges [member] | Currency risk [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 94,000,000 R$ 28,000,000  
Hedging instrument, liabilities 1,000,000    
Swaps [Member] | Cash flow hedges [member] | Interest rate risk [member]      
IfrsStatementLineItems [Line Items]      
Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness (1,000,000)    
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (1,000,000)    
Swaps [Member] | Cash flow hedges [member] | Currency risk [member]      
IfrsStatementLineItems [Line Items]      
Nominal Value 359,000,000    
Hedging instrument, assets R$ 54,000,000