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Segmental information - Additional Information (Details) - United States - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of reportable segments [line items]    
Tangible fixed assets $ 294 $ 307
Property, plant and equipment    
Disclosure of reportable segments [line items]    
Tangible fixed assets 93 99
Right-of-use assets    
Disclosure of reportable segments [line items]    
Tangible fixed assets $ 201 $ 208