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Financial risk management and derivative financial instruments - Additional Information (Detail)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2025
EUR (€)
Sep. 30, 2025
EUR (€)
Disclosure of financial risk management [line items]          
Ratio between the hedged item and the hedging instrument 1     1  
Gain (loss) on hedged item $ 151 $ (90)      
Gains (losses) on net investment hedges 35 (7) $ 15    
Cash and cash equivalents with restrictions on use $ 27 $ 22      
Cash flow leverage ratio 2.50 2.34   2.50  
Below BBB-          
Disclosure of financial risk management [line items]          
Additional step-up coupon rate payable 1.25%     1.25%  
Below Baa3          
Disclosure of financial risk management [line items]          
Additional step-up coupon rate payable 1.25%     1.25%  
Minimum          
Disclosure of financial risk management [line items]          
cash flow expected stated ratio 2.5     2.5  
Maximum          
Disclosure of financial risk management [line items]          
cash flow expected stated ratio 3.0     3.0  
Currency swaps          
Disclosure of financial risk management [line items]          
(Loss) gain relating to other fair value movements $ (37) $ 28      
Interest rate risk | Significant interest rate benchmarks subject to interest rate benchmark reform          
Disclosure of financial risk management [line items]          
Fixed Interest rate borrowings 100.00% 100.00%   100.00%  
Interest rate risk | Minimum | Significant interest rate benchmarks subject to interest rate benchmark reform          
Disclosure of financial risk management [line items]          
Fixed Interest rate borrowings 50.00%     50.00%  
Liquidity risk          
Disclosure of financial risk management [line items]          
Cash and cash equivalents with restrictions on use $ 4 $ 2      
Carrying Amounts | Currency swaps          
Disclosure of financial risk management [line items]          
Gain (loss) on carrying amount $ 145 $ (102)      
€500m 2.125% bonds 2027          
Disclosure of financial risk management [line items]          
Swaps held by Group | €       € 500  
Interest
rate 2.125%     2.125%  
€600m 4.375% bonds 2029          
Disclosure of financial risk management [line items]          
Swaps held by Group | €       € 600  
Interest
rate 4.375%     4.375%  
EUR750m 3.625% bonds 2031          
Disclosure of financial risk management [line items]          
Swaps held by Group | €       € 750  
Interest
rate 3.625%     3.625%  
€850m 3.375% bonds 2030          
Disclosure of financial risk management [line items]          
Swaps held by Group | €       € 850 € 850
Interest
rate 3.375%     3.375%  
Revolving Credit Facilities          
Disclosure of financial risk management [line items]          
Interest margin payable 0.45%     0.45%