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Tax - Summary of Reconciliation of Tax Charge (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of income tax reconciliation [line items]      
Tax at UK blended rate (in percent) 25.00% 25.00% 23.50%
Tax credits (in percent) (0.50%) (0.60%) (0.50%)
System Fund (in percent) (0.10%) 1.20% (1.30%)
Foreign exchange losses/(gains) (in percent) (0.60%) 1.00% (1.00%)
Other permanent differences (in percent) 0.00% (0.50%) 0.90%
Non-recoverable foreign taxes (in percent) 3.00% 2.40% 1.30%
Net effect of different rates of tax (in percent) 0.40% 1.50% 1.50%
Effects of substantive enactment of UAE tax rates and laws (in percent) 0.00% 0.00% (0.90%)
Effect of changes in other tax rates and laws (in percent) 0.00% 0.00% 0.20%
Items on which deferred tax arose but where no deferred tax is recognised (in percent) 0.20% 0.20% 0.20%
Effect of adjustments to unprovided or unrecognised deferred taxes (in percent) 1.90% 0.00% 0.50%
Adjustment to tax charge in respect of prior periods (in percent) 0.00% (0.20%) 1.30%
Average effective tax rate (in percent) 29.30% 30.00% 25.70%
Deferred tax assets $ 146 $ 122  
Aggregate percentage points     0.70%
UAE      
Disclosure of income tax reconciliation [line items]      
Deferred tax assets     $ 9
Before Exceptional Items System Funds And Foreign Exchange Gains      
Disclosure of income tax reconciliation [line items]      
Other permanent differences (in percent) (0.80%) (1.00%) (0.60%)
Before exceptional items and System Funds | United States      
Disclosure of income tax reconciliation [line items]      
Net effect of different rates of tax (in percent) 1.10% 1.20% 1.30%