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Post-Employment Obligations - Schedule of Changes in Net Liabilities (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]        
Net liabilities, Beginning balance R$ 4,306 R$ 5,417 R$ 5,693 R$ 6,205
Expense recognized in Statement of income   488 668 670
Past service cost     (56) (4)
Contributions paid   (440) (536) (482)
Actuarial gains (losses)   (1,159) (352) (696)
Net liabilities, Ending balance   4,306 5,417 5,693
Current liabilities   233 329  
Non-currentliabilities   4,073 5,088  
Pension And Retirement Supplement Plans [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities, Beginning balance 1,702 2,357 2,318 2,670
Expense recognized in Statement of income   214 280 285
Past service cost     (4)
Contributions paid   (239) (313) (272)
Actuarial gains (losses)   (630) [1] 72 (361)
Net liabilities, Ending balance   1,702 2,357 2,318
Health plan [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities, Beginning balance 2,560 3,007 3,314 3,469
Expense recognized in Statement of income   269 381 378
Past service cost     (55)
Contributions paid   (197) (218) (206)
Actuarial gains (losses) 305 (519) (415) (327)
Net liabilities, Ending balance   2,560 3,007 3,314
Dental plan [member]        
IfrsStatementLineItems [Line Items]        
Net liabilities, Beginning balance 44 53 61 66
Expense recognized in Statement of income   5 7 7
Past service cost     (1)
Contributions paid   (4) (5) (4)
Actuarial gains (losses) R$ 5 (10) (9) (8)
Net liabilities, Ending balance   44 R$ 53 R$ 61
Current liabilities   233    
Non-currentliabilities   R$ 4,073    
[1] The reduction of liabilities is, essentially, due to the changes in the actuarial assumptions used. There is more information below in this note.