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Risk and Capital Management (Details 17) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Private Pension R$ 12,184 R$ 9,669 R$ 10,316
5% increase in mortality rates [Member]      
IfrsStatementLineItems [Line Items]      
Private Pension 48 45  
Insurance (7) (2)  
5% decrease in mortality rates [Member]      
IfrsStatementLineItems [Line Items]      
Private Pension (49) (48)  
Insurance 7 2  
Zero Point One Percentage Increase In Riskfree Interest Rates [Member]      
IfrsStatementLineItems [Line Items]      
Private Pension 110 102  
Insurance 7 10  
0.1% decrease in risk-free interest rates [Member]      
IfrsStatementLineItems [Line Items]      
Private Pension (113) (104)  
Insurance (7) (10)  
5% increase in conversion in income rates [Member]      
IfrsStatementLineItems [Line Items]      
Private Pension (13) (11)  
5% decrease in conversion in income rates [Member]      
IfrsStatementLineItems [Line Items]      
Private Pension 15 11  
5% increase in claims [Member]      
IfrsStatementLineItems [Line Items]      
Insurance (50) (58)  
5% decrease in claims [Member]      
IfrsStatementLineItems [Line Items]      
Insurance R$ 50 R$ 58