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Borrowings - Additional Information (Details)
£ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Feb. 29, 2024
Dec. 31, 2024
GBP (£)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
EUR (€)
Sep. 30, 2024
USD ($)
Jun. 30, 2024
GBP (£)
Mar. 31, 2024
EUR (€)
Dec. 31, 2023
GBP (£)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
EUR (€)
Disclosure of bank overdraft bonds and bank loans [line items]                    
Borrowings | £   £ 4,328           £ 4,721    
USD Bonds Due September 2042                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Notional amount of hedged items | $     $ 93              
Average interest rate   5.125% 5.125% 5.125%            
USD Bonds Due November 2043                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Notional amount of hedged items | $     $ 220              
Average interest rate   5.625% 5.625% 5.625%            
USD Bonds Due September 2024                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Notional amount of hedged items | $         $ 750          
Adjustment to floating basis   3.75% 3.75% 3.75%            
Eurobonds Due March 2025                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Notional amount of hedged items       € 500,000,000            
Average interest rate   1.375% 1.375% 1.375%            
Eurobonds Due September 2026                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Notional amount of hedged items       € 750,000,000            
Average interest rate   2.25% 2.25% 2.25%            
Euro bonds Due May 2027                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Notional amount of hedged items       € 750,000,000            
Average interest rate   2.375% 2.375% 2.375%            
Eurobonds Due May 2028                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Notional amount of hedged items       € 550,000,000            
Average interest rate   4.125% 4.125% 4.125%            
Borrowings repurchased       € 200,000,000            
Euro Bonds Due September 2029                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Notional amount of hedged items       € 351,000,000     € 600,000,000      
Average interest rate   3.625% 3.625% 3.625%            
Borrowings repurchased       € 249,000,000            
Eurobonds Due March 2030                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Notional amount of hedged items       € 600,000,000            
Average interest rate   1.625% 1.625% 1.625%            
Eurobonds Due September 2033                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Notional amount of hedged items       € 500,000,000     € 650,000,000      
Average interest rate   4.00% 4.00% 4.00%            
Borrowings repurchased       € 150,000,000            
Sterling bonds due May 2032                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Notional amount of hedged items | £   £ 250                
Average interest rate   3.75% 3.75% 3.75%            
Sterling Bonds Due September 2046                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Notional amount of hedged items | £   £ 380       £ 20        
Average interest rate           2.875%        
US Revolving Credit Facilities March 2026                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Notional amount of hedged items   £ 2,500 $ 2,500              
Borrowings term   5 years                
Extension option term   2 years                
US Revolving Credit Facilities February 2029                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Borrowings term 5 years                  
Extension option term   2 years                
US revolving credit facilities                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Average interest rate               4.54% 4.54% 4.54%
Borrowings averaged equivalent | $                 $ 41  
US commercial paper                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Average interest rate   5.36% 5.36% 5.36%       5.45% 5.45% 5.45%
Borrowings       € 0            
US commercial paper | Weighted average                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Borrowings | $     $ 194           $ 433  
Euro commercial paper                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Average interest rate               4.90% 4.90% 4.90%
Borrowings       0            
Euro commercial paper | Weighted average                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Borrowings       € 0           € 45,000,000
Corporate bond                    
Disclosure of bank overdraft bonds and bank loans [line items]                    
Fair value of corporate bonds | £   £ 3,964           £ 4,120