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Hedge accounting (Details 4) - BRL (R$)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount R$ 273,280,000,000 R$ 148,125,000,000
Fair value hedges [member]    
IfrsStatementLineItems [Line Items]    
Book value of the hedged item, Assets 23,394,000,000 12,052,000,000
Fair value of the hedge item, Assets 22,716,000,000 12,045,000,000
Variation in fair value recognized in income 20,000,000 383,000,000
Credit derivative, nominal amount 37,951,000,000 22,826,000,000
Variation in fair value used to calculate hedge ineffectiveness (30,000,000) (387,000,000)
Hedge Of Loan Operations [Member] | Fair value hedges [member]    
IfrsStatementLineItems [Line Items]    
Book value of the hedged item, Assets 16,031,000,000 8,890,000,000
Fair value of the hedge item, Assets 15,582,000,000 8,917,000,000
Variation in fair value recognized in income (449,000,000) 27,000,000
Credit derivative, nominal amount 16,031,000,000 8,890,000,000
Variation in fair value used to calculate hedge ineffectiveness 448,000,000 (28,000,000)
Hedge of fair value through other comprehensive income [member]    
IfrsStatementLineItems [Line Items]    
Hedged item, liabilities 14,603,000,000 11,051,000,000
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 13,905,000,000 10,661,000,000
Hedge of fair value through other comprehensive income [member] | Fair value hedges [member]    
IfrsStatementLineItems [Line Items]    
Book value of the hedged item, Assets 7,363,000,000 3,162,000,000
Fair value of the hedge item, Assets 7,134,000,000 3,128,000,000
Variation in fair value recognized in income (229,000,000) (34,000,000)
Credit derivative, nominal amount 7,317,000,000 2,885,000,000
Variation in fair value used to calculate hedge ineffectiveness 225,000,000 29,000,000
Hedge of fair value through other comprehensive income [member] | Hedge Of Funding [Member]    
IfrsStatementLineItems [Line Items]    
Hedged item, liabilities 14,603,000,000 11,051,000,000
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities 13,905,000,000 10,661,000,000
Hedge Of Funding [Member] | Fair value hedges [member]    
IfrsStatementLineItems [Line Items]    
Variation in fair value recognized in income 698,000,000 390,000,000
Credit derivative, nominal amount 14,603,000,000 11,051,000,000
Variation in fair value used to calculate hedge ineffectiveness (703,000,000) (388,000,000)
Hedged Instrumnets Impacted By Change In Interest Rates [Member]    
IfrsStatementLineItems [Line Items]    
Credit derivative, nominal amount R$ 4,349,000,000 R$ 6,422,000,000