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Post-Employment Obligations - Schedule of Changes in Net Liabilities (Details)
R$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
BRL (R$)
Dec. 31, 2022
BRL (R$)
Dec. 31, 2021
BRL (R$)
IfrsStatementLineItems [Line Items]        
Net liabilities, Beginning balance   R$ 5,693 R$ 6,205 R$ 6,843
Expense recognized in Statement of income   668 670 501
Contributions paid   (536) (482) (422)
Actuarial gains (losses)   (352) (696) (302)
Past service cost   (56) (4) (415)
Net liabilities, Ending balance   5,417 5,693 6,205
Current liabilities   329 388  
Non-currentliabilities   5,088 5,304  
Pension And Retirement Supplement Plans [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities, Beginning balance   2,318 2,670 2,909
Expense recognized in Statement of income   280 285 200
Contributions paid   (313) (272) (236)
Actuarial gains (losses)   72 (361) (203)
Past service cost     (4)  
Net liabilities, Ending balance   2,357 2,318 2,670
Health plan [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities, Beginning balance   3,314 3,469 3,319
Expense recognized in Statement of income   381 378 253
Contributions paid   (218) (206) (173)
Actuarial gains (losses) $ 268 (415) (327) 70
Past service cost   (55)    
Net liabilities, Ending balance   3,007 3,314 3,469
Dental plan [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities, Beginning balance   61 66 64
Expense recognized in Statement of income   7 7 6
Contributions paid   (5) (4) (3)
Actuarial gains (losses) $ 5 (9) (8) (1)
Past service cost   (1)    
Net liabilities, Ending balance   53 61 66
Life Insurance [Member]        
IfrsStatementLineItems [Line Items]        
Net liabilities, Beginning balance     551
Expense recognized in Statement of income       42
Contributions paid       (10)
Actuarial gains (losses)       (168)
Past service cost       (415)
Net liabilities, Ending balance      
Current liabilities   329    
Non-currentliabilities   R$ 5,088