v3.25.4
Employee Benefit Plans - Summary of Activity in Defined Benefit Obligation (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of net defined benefit liability (asset) [Line Items]    
Beginning of period $ (483) $ (490)
Current service cost (5) (6)
Interest cost 25 23
Administration fees disbursements 15 15
Plan amendments 1 (12)
Exchange differences (1) 3
End of period (421) (483)
Present Value of Defined Benefit Obligation [Member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Beginning of period (2,628) (2,887)
Current service cost (5) (6)
Administration fees (15) (15)
Interest cost (141) (136)
Actuarial (losses) gains from changes in financial assumptions (20) 189
 Actuarial gains from changes in demographic assumptions 26 0
Experience (losses) gains (26) (7)
Contributions by employees (3) (4)
Benefits paid 195 190
Administration fees disbursements 16 15
Plan amendments (1) 12
Exchange differences (56) 21
End of period (2,658) (2,628)
Funded Plans [Member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Current service cost (4) (4)
Interest cost 12 10
Administration fees disbursements 15 15
Plan amendments 0 1
Funded Plans [Member] | Present Value of Defined Benefit Obligation [Member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Beginning of period (2,382) (2,606)
Current service cost (4) (4)
Administration fees (15) (15)
Interest cost (128) (123)
Actuarial (losses) gains from changes in financial assumptions (16) 179
 Actuarial gains from changes in demographic assumptions 26 0
Experience (losses) gains (30) (4)
Contributions by employees (3) (2)
Benefits paid 169 159
Administration fees disbursements 16 15
Plan amendments 0 (1)
Exchange differences (56) 20
End of period (2,423) (2,382)
Unfunded Plans [Member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Current service cost (1) (1)
Interest cost 11 11
Administration fees disbursements 0 0
Plan amendments 0 0
Unfunded Plans [Member] | Present Value of Defined Benefit Obligation [Member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Beginning of period (212) (231)
Current service cost (1) (1)
Administration fees 0 0
Interest cost (11) (11)
Actuarial (losses) gains from changes in financial assumptions (3) 9
 Actuarial gains from changes in demographic assumptions 0 0
Experience (losses) gains 0 (1)
Contributions by employees 0 0
Benefits paid 22 22
Administration fees disbursements 0 0
Plan amendments 0 0
Exchange differences (1) 1
End of period (206) (212)
Other Post Employment Benefits [Member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Beginning of period (60) (72)
Current service cost 0 (1)
Interest cost 2 2
Administration fees disbursements 0 0
Plan amendments 1 (13)
Exchange differences (1) 3
End of period (59) (60)
Other Post Employment Benefits [Member] | Present Value of Defined Benefit Obligation [Member]    
Disclosure of net defined benefit liability (asset) [Line Items]    
Beginning of period (34) (50)
Current service cost 0 (1)
Administration fees 0 0
Interest cost (2) (2)
Actuarial (losses) gains from changes in financial assumptions (1) 1
 Actuarial gains from changes in demographic assumptions 0 0
Experience (losses) gains 4 (2)
Contributions by employees 0 (2)
Benefits paid 4 9
Administration fees disbursements 0 0
Plan amendments (1) 13
Exchange differences 1 0
End of period $ (29) $ (34)