v3.26.1
Basis of preparation and accounting policies (Details)
$ in Millions
 6 Months Ended
Jun. 27, 2026
USD ($)
Dec. 31, 2025
USD ($)
Jun. 28, 2025
USD ($)
Dec. 31, 2024
USD ($)
Disclosure of detailed informations about basis of preparation [line items]        
Cash and cash equivalents (net of bank overdrafts) $ 750 [1] $ 553 $ 673 [1] $ 617
Net debt 3,019 2,759 2,747  
Borrowings 3,588 3,111 3,246  
Corporate bond 2,670 $ 2,478 $ 2,603  
Committed facilities        
Disclosure of detailed informations about basis of preparation [line items]        
Committed facilities 4,700      
Private placement debt        
Disclosure of detailed informations about basis of preparation [line items]        
Borrowings subject to financial covenants $ 550      
Leverage ratio 3.5      
Not later than six months        
Disclosure of detailed informations about basis of preparation [line items]        
Net debt $ 0      
Borrowings 0      
Past due more than six months and not more than one year | US Corporate Bonds        
Disclosure of detailed informations about basis of preparation [line items]        
Borrowings 350      
Past due more than six months and not more than one year | Private placement debt        
Disclosure of detailed informations about basis of preparation [line items]        
Borrowings $ 140      
[1] Cash and cash equivalents at the end of the period is net of overdrafts of $4m (28 June 2025: $3m).