v3.25.4
Employee Benefit Plans - Summary of Net Surpluses (Obligations) of Material Defined Benefit Plans (Detail) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [line items]      
Fair value of plan assets $ 2,270 $ 2,174  
Net plan surpluses 83 40  
Net plan obligations (421) (483) $ (490)
Other Post Employment Benefits [Member]      
Disclosure of defined benefit plans [line items]      
Net plan obligations (59) (60) $ (72)
Material Defined Benefit Plans [Member]      
Disclosure of defined benefit plans [line items]      
Present value of plan obligations (2,658) (2,628)  
Fair value of plan assets 2,270 2,174  
Net plan obligations (388) (454)  
Net plan surpluses 76 34  
Net plan obligations (464) (488)  
Material Defined Benefit Plans [Member] | Funded Plans [Member]      
Disclosure of defined benefit plans [line items]      
Present value of plan obligations (2,423) (2,382)  
Fair value of plan assets 2,270 2,174  
Net plan obligations (153) (208)  
Net plan surpluses 76 34  
Net plan obligations (229) (242)  
Material Defined Benefit Plans [Member] | Unfunded Plans [Member]      
Disclosure of defined benefit plans [line items]      
Present value of plan obligations (206) (212)  
Fair value of plan assets 0 0  
Net plan obligations (206) (212)  
Net plan surpluses 0 0  
Net plan obligations (206) (212)  
Material Defined Benefit Plans [Member] | Other Post Employment Benefits [Member]      
Disclosure of defined benefit plans [line items]      
Present value of plan obligations (29) (34)  
Fair value of plan assets 0 0  
Net plan obligations (29) (34)  
Net plan surpluses 0 0  
Net plan obligations $ (29) $ (34)