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Post-employment benefits (Details 4)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
BRL (R$)
IfrsStatementLineItems [Line Items]  
2025 R$ 2,045
2026 2,016
2027 2,052
2028 2,076
2029 2,127
2030 to 2034 R$ 11,228
Funbep Fundo De Pensao Multipatrocinado [Member]  
IfrsStatementLineItems [Line Items]  
Duration 8 years 29 days
2025 R$ 1,244
2026 1,192
2027 1,230
2028 1,264
2029 1,298
2030 to 2034 R$ 6,886
Fundacao Itau Unibanco Previdencia Complementar [Member]  
IfrsStatementLineItems [Line Items]  
Duration 7 years 7 months 6 days
2025 R$ 716
2026 733
2027 750
2028 767
2029 782
2030 to 2034 R$ 4,084
Other Post Employment Benefits [Member]  
IfrsStatementLineItems [Line Items]  
Duration 7 years 3 months 14 days
2025 R$ 85
2026 91
2027 72
2028 45
2029 47
2030 to 2034 R$ 258