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Post-Employment Obligations - Schedule of main categories of plan assets (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Fair value of plan assets R$ 8,947 R$ 9,882
Shares [member]    
IfrsStatementLineItems [Line Items]    
Fair value of plan assets 1,076 1,339
Fixed income securities [Member]    
IfrsStatementLineItems [Line Items]    
Fair value of plan assets 6,560 7,475
Real estate property [member]    
IfrsStatementLineItems [Line Items]    
Fair value of plan assets 479 440
Others [member]    
IfrsStatementLineItems [Line Items]    
Fair value of plan assets R$ 832 R$ 628