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Securities - Summary of Securities at Fair Value Through Other Comprehensive Income (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets [line items]    
Fair value through other comprehensive income R$ 44,062,950 R$ 34,478,668
Gross carrying amount    
Disclosure of financial assets [line items]    
Fair value through other comprehensive income 43,693,837 35,150,599
Fair value    
Disclosure of financial assets [line items]    
Fair value through other comprehensive income 44,062,950 34,478,668
National Treasury Bills | Gross carrying amount    
Disclosure of financial assets [line items]    
Fair value through other comprehensive income 41,023,844 33,532,740
National Treasury Bills | Fair value    
Disclosure of financial assets [line items]    
Fair value through other comprehensive income 41,343,987 32,931,403
Bonds | Gross carrying amount    
Disclosure of financial assets [line items]    
Fair value through other comprehensive income 0 1,379,129
Bonds | Fair value    
Disclosure of financial assets [line items]    
Fair value through other comprehensive income 0 1,321,258
Foreign sovereign bonds | Gross carrying amount    
Disclosure of financial assets [line items]    
Fair value through other comprehensive income 2,669,993 0
Foreign sovereign bonds | Fair value    
Disclosure of financial assets [line items]    
Fair value through other comprehensive income 2,718,963 0
Corporate bonds | Gross carrying amount    
Disclosure of financial assets [line items]    
Fair value through other comprehensive income 0 238,730
Corporate bonds | Fair value    
Disclosure of financial assets [line items]    
Fair value through other comprehensive income R$ 0 R$ 226,007