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Other financial assets - Additional Information (Details)
£ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2025
GBP (£)
Dec. 31, 2024
USD ($)
Disclosure of financial assets [line items]      
Decrease in restricted fund charge $ 7 £ 5  
Other financial assets 214   $ 219
Trade deposits and loans      
Disclosure of financial assets [line items]      
Gross amounts of trade deposits and loans 56   51
Provision for expected credit loss allowance financial assets 5   3
Other financial assets      
Disclosure of financial assets [line items]      
Other financial assets $ 53   $ 50