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Tax - Deferred Tax - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of income tax reconciliation [line items]    
Deferred tax assets liabilities net threshold $ 10  
Deferred tax assets recognized related to legal entities which suffered tax loss 4 $ 3
Deferred tax assets 146 122
Deferred tax liabilities 17 18
Uncertain tax positions included within current tax liability 11 9
Maximum    
Disclosure of income tax reconciliation [line items]    
Uncertain tax positions included within current tax liability 3 3
United Kingdom    
Disclosure of income tax reconciliation [line items]    
Deferred tax assets 92 99
Deferred tax assets relating to revenue losses 65 62
Deferred tax assets relating to capital allowances $ 30 32
Deferred tax asset offset percentage on annual profits (50% restriction on deferred tax losses) 50.00%  
United Kingdom | Software    
Disclosure of income tax reconciliation [line items]    
Deferred tax liabilities $ 19 13
Unprovided deferred tax on unremitted earnings    
Disclosure of income tax reconciliation [line items]    
Unremitted earnings on which no deferred tax provided $ 42 $ 517