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Post-Employment Obligations - Schedule of Changes in Present Value of Defined Benefit Obligation (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]        
Defined-benefit obligation, beginning balance R$ 13,105 R$ 15,276 R$ 14,778 R$ 15,561
Cost of current service   7 11 18
Past service cost     (56) (4)
Interest on actuarial obligation   1,322 1,653 1,592
Actuarial losses (gains):        
Due to changes in demographic assumptions   (1) 27 (8)
Due to changes in financial assumptions   (2,448) 990 (1,168)
Due to adjustments based on experience   269 (812) 83
Due to changes and adjustments    (2,180) 205 (1,093)
Benefits paid   (1,320) (1,315) (1,296)
Net defined benefit liability (asset)   13,105 15,276 14,778
Pension plans and retirement supplement plans [member]        
IfrsStatementLineItems [Line Items]        
Defined-benefit obligation, beginning balance 10,501 12,216 11,404 12,026
Cost of current service 1 1 2
Past service cost     [1] (4) [2]
Interest on actuarial obligation 1,222 1,055 1,276 1,224
Actuarial losses (gains):        
Due to changes in demographic assumptions   (7)
Due to changes in financial assumptions   (1,883) 754 (857)
Due to adjustments based on experience   232 (125) 106
Due to changes and adjustments    (1,651) 629 (758)
Benefits paid   (1,120) (1,093) (1,086)
Net defined benefit liability (asset)   10,501 12,216 11,404
Health plan [member]        
IfrsStatementLineItems [Line Items]        
Defined-benefit obligation, beginning balance 2,559 3,007 3,314 3,469
Cost of current service 4 6 11 16
Past service cost     (55)
Interest on actuarial obligation 301 262 370 361
Actuarial losses (gains):        
Due to changes in demographic assumptions   (1) 26 (1)
Due to changes in financial assumptions   556 232 (305)
Due to adjustments based on experience   38 (673) (20)
Due to changes and adjustments    (519) (415) (326)
Benefits paid   (197) (218) (206)
Net defined benefit liability (asset)   2,559 3,007 3,314
Dental plan [member]        
IfrsStatementLineItems [Line Items]        
Defined-benefit obligation, beginning balance 45 53 60 66
Cost of current service
Past service cost     (1)
Interest on actuarial obligation R$ 5 5 7 7
Actuarial losses (gains):        
Due to changes in demographic assumptions   1
Due to changes in financial assumptions   (9) 4 (6)
Due to adjustments based on experience   (1) (14) (3)
Due to changes and adjustments    (10) (9) (9)
Benefits paid   (3) (4) (4)
Net defined benefit liability (asset)   R$ 45 R$ 53 R$ 60
[1]

Relating to the changes in the conditions of Plan B for requesting the Enhancement of Retirement for Length of Contribution, Special or Age - MAT (Melhoria de Aposentadoria por Tempo de Contribuição, Especial ou or Idade).
[2]

Due to the alterations made in the Collective Work Agreement for 2021-23, for offer and payment of life insurance for the employees and former employees, the Company understood that the post-retirement benefit in question had been entirely canceled, and as a result wrote down the balance of the obligation, remeasured using the revised actuarial assumptions.