v3.25.4
Employee Benefit Plans - Summary of Amounts Recognized in Other Comprehensive Loss (Income) for Material Defined Benefit Plans (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Remeasurement (gains) losses on defined benefit obligation    
Total recognized in other comprehensive (income) loss before taxation $ 83 $ 5
Other Post Employment Benefits [Member]    
Remeasurement (gains) losses on defined benefit obligation    
Total recognized in other comprehensive (income) loss before taxation 6 (6)
Material defined benefit plans [Member]    
Remeasurement (gains) losses on defined benefit obligation    
Due to financial assumption changes 20 (189)
Due to demographic assumption changes (26) 0
Due to experience 26 7
Return on plan assets (greater than) less than discount rate (99) 173
Total recognized in other comprehensive (income) loss before taxation (79) (9)
Material defined benefit plans [Member] | Funded Plans [Member]    
Remeasurement (gains) losses on defined benefit obligation    
Due to financial assumption changes 16 (179)
Due to demographic assumption changes (26) 0
Due to experience 30 4
Return on plan assets (greater than) less than discount rate (99) 173
Total recognized in other comprehensive (income) loss before taxation (79) (2)
Material defined benefit plans [Member] | Unfunded Plans [Member]    
Remeasurement (gains) losses on defined benefit obligation    
Due to financial assumption changes 3 (9)
Due to demographic assumption changes 0 0
Due to experience 0 1
Return on plan assets (greater than) less than discount rate 0 0
Total recognized in other comprehensive (income) loss before taxation 3 (8)
Material defined benefit plans [Member] | Other Post Employment Benefits [Member]    
Remeasurement (gains) losses on defined benefit obligation    
Due to financial assumption changes 1 (1)
Due to demographic assumption changes 0 0
Due to experience (4) 2
Return on plan assets (greater than) less than discount rate   0
Total recognized in other comprehensive (income) loss before taxation $ (3) $ 1