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Insurance contracts and private pension (Details 4) - Private Pension [Member] - BRL (R$)
R$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Estimate Of Present Value Of Future Cash Flows [Member]    
IfrsStatementLineItems [Line Items]    
Opening balance - 01/01 R$ 245,564 R$ 210,255
Realization of Insurance Contractual Margin
Actuarial Remeasurements 379 (1,330)
Income from Insurance Contracts and Private Pension 379 (1,330)
New Recognized Insurance Contracts (3,103) (2,520)
Financial Income from Insurance Contracts and Private Pension 22,729 29,406
Recognized in Income for the period 23,410 28,309
Recognized in Other Comprehensive Income (681) 1,097
Premiums Received, Claims and Other Expenses Paid 13,651 9,753
Closing Balance 279,220 245,564
Contractual service margin [member]    
IfrsStatementLineItems [Line Items]    
Opening balance - 01/01 19,936 17,696
Realization of Insurance Contractual Margin (1,899) (1,829)
Actuarial Remeasurements (196) 1,534
Income from Insurance Contracts and Private Pension (2,095) (295)
New Recognized Insurance Contracts 3,097 2,514
Financial Income from Insurance Contracts and Private Pension 6 21
Recognized in Income for the period 6 21
Recognized in Other Comprehensive Income
Premiums Received, Claims and Other Expenses Paid
Closing Balance 20,944 19,936
Risk Adjustments For Nonfinancial Risk [Member]    
IfrsStatementLineItems [Line Items]    
Opening balance - 01/01 321 271
Realization of Insurance Contractual Margin
Actuarial Remeasurements (22) 16
Income from Insurance Contracts and Private Pension (22) 16
New Recognized Insurance Contracts 6 6
Financial Income from Insurance Contracts and Private Pension 1 28
Recognized in Income for the period 11 10
Recognized in Other Comprehensive Income (10) 18
Premiums Received, Claims and Other Expenses Paid
Closing Balance 306 321
Total One [Member]    
IfrsStatementLineItems [Line Items]    
Opening balance - 01/01 265,821 228,222
Realization of Insurance Contractual Margin (1,899) (1,829)
Actuarial Remeasurements 161 220
Income from Insurance Contracts and Private Pension (1,738) (1,609)
New Recognized Insurance Contracts
Financial Income from Insurance Contracts and Private Pension 22,736 29,455
Recognized in Income for the period 23,427 28,340
Recognized in Other Comprehensive Income (691) 1,115
Premiums Received, Claims and Other Expenses Paid 13,651 9,753
Closing Balance R$ 300,470 R$ 265,821