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Financial assets at fair value through other comprehensive income - Securities (Details 1) - BRL (R$)
R$ in Millions
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Gross carrying amount R$ 59,191 R$ 27,398
Current Fair value 55,405 26,428
Non-current gross carrying amount 68,823 81,157
Non-current fair value 65,647 79,194
Gross carrying amount 128,014 108,555
Fair value 121,052 105,622
Non-stated maturity [Member]    
IfrsStatementLineItems [Line Items]    
Gross carrying amount 8,571 1,629
Current Fair value 4,885 743
Not later than one year [member]    
IfrsStatementLineItems [Line Items]    
Gross carrying amount 50,620 25,769
Current Fair value 50,520 25,685
Later than one year and not later than five years [member]    
IfrsStatementLineItems [Line Items]    
Non-current gross carrying amount 48,593 64,034
Non-current fair value 47,249 63,256
Later than five years and not later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Non-current gross carrying amount 14,456 12,017
Non-current fair value 13,543 11,557
Later than ten years [member]    
IfrsStatementLineItems [Line Items]    
Non-current gross carrying amount 5,774 5,106
Non-current fair value R$ 4,855 R$ 4,381