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Condensed parent company financial information - Company Provided Maturity Profile of Borrowings of the Parent Company and Borrowings of Subsidiaries Carrying Value (Detail)
€ in Millions, £ in Millions, $ in Millions
Dec. 31, 2025
EUR (€)
Dec. 31, 2025
GBP (£)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Disclosure of detailed information about borrowings [line items]        
Borrowings     $ 4,201 $ 3,274
£350m 2.125% bonds 2026        
Disclosure of detailed information about borrowings [line items]        
Notional amount | £   £ 350    
Interest
rate 2.125% 2.125% 2.125%  
Borrowings     $ 475 441
€500m 2.125% bonds 2027        
Disclosure of detailed information about borrowings [line items]        
Notional amount | € € 500      
Interest
rate 2.125% 2.125% 2.125%  
Borrowings     $ 594 $ 526
£400m 3.375% bonds 2028        
Disclosure of detailed information about borrowings [line items]        
Notional amount | £   £ 400    
Interest
rate 3.375% 3.375% 3.375%  
Parent Company | £350m 2.125% bonds 2026        
Disclosure of detailed information about borrowings [line items]        
Notional amount     $ 350  
Interest
rate 2.125% 2.125% 2.125%  
Parent Company | €500m 2.125% bonds 2027        
Disclosure of detailed information about borrowings [line items]        
Notional amount     $ 500  
Interest
rate 2.125% 2.125% 2.125%  
Parent Company | £400m 3.375% bonds 2028        
Disclosure of detailed information about borrowings [line items]        
Notional amount     $ 400  
Interest
rate 3.375% 3.375% 3.375%  
Parent Company | Between one and two years        
Disclosure of detailed information about borrowings [line items]        
Borrowings     $ 471  
Parent Company | Between one and two years | £350m 2.125% bonds 2026        
Disclosure of detailed information about borrowings [line items]        
Borrowings     471  
Parent Company | Between one and two years | €500m 2.125% bonds 2027        
Disclosure of detailed information about borrowings [line items]        
Borrowings     0  
Parent Company | Between one and two years | £400m 3.375% bonds 2028        
Disclosure of detailed information about borrowings [line items]        
Borrowings     0  
Parent Company | Between two and three years        
Disclosure of detailed information about borrowings [line items]        
Borrowings     587  
Parent Company | Between two and three years | £350m 2.125% bonds 2026        
Disclosure of detailed information about borrowings [line items]        
Borrowings     0  
Parent Company | Between two and three years | €500m 2.125% bonds 2027        
Disclosure of detailed information about borrowings [line items]        
Borrowings     587  
Parent Company | Between two and three years | £400m 3.375% bonds 2028        
Disclosure of detailed information about borrowings [line items]        
Borrowings     0  
Parent Company | Between three and four years        
Disclosure of detailed information about borrowings [line items]        
Borrowings     538  
Parent Company | Between three and four years | £350m 2.125% bonds 2026        
Disclosure of detailed information about borrowings [line items]        
Borrowings     0  
Parent Company | Between three and four years | €500m 2.125% bonds 2027        
Disclosure of detailed information about borrowings [line items]        
Borrowings     0  
Parent Company | Between three and four years | £400m 3.375% bonds 2028        
Disclosure of detailed information about borrowings [line items]        
Borrowings     $ 538