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Property, plant and equipment - Summary of Net Book Value of Property, Plant and Equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Changes in property, plant and equipment [abstract]    
Beginning balance $ 146 $ 153
Ending balance 148 146
Cost    
Changes in property, plant and equipment [abstract]    
Beginning balance 387 411
Additions 28 27
Fully depreciated assets written off (32) (30)
Disposals (1) (16)
Exchange and other adjustments 10 (5)
Ending balance 392 387
Amortisation and impairment    
Changes in property, plant and equipment [abstract]    
Beginning balance (241) (258)
Fully depreciated assets written off 32 30
Disposals 1 8
Exchange and other adjustments (5) 4
Provided (27) (24)
System Fund expense (3) (4)
Impairment charge (1)  
Impairment reversal   3
Ending balance (244) (241)
Land and buildings    
Changes in property, plant and equipment [abstract]    
Beginning balance 46 57
Ending balance 42 46
Land and buildings | Cost    
Changes in property, plant and equipment [abstract]    
Beginning balance 99 111
Additions 0 0
Fully depreciated assets written off 0 (3)
Disposals 0 (8)
Exchange and other adjustments 0 (1)
Ending balance 99 99
Land and buildings | Amortisation and impairment    
Changes in property, plant and equipment [abstract]    
Beginning balance (53) (54)
Fully depreciated assets written off 0 3
Disposals 0 0
Exchange and other adjustments 0 1
Provided (3) (3)
System Fund expense 0 0
Impairment charge (1)  
Impairment reversal   0
Ending balance (57) (53)
Fixtures, fittings and equipment    
Changes in property, plant and equipment [abstract]    
Beginning balance 100 96
Ending balance 106 100
Fixtures, fittings and equipment | Cost    
Changes in property, plant and equipment [abstract]    
Beginning balance 288 300
Additions 28 27
Fully depreciated assets written off (32) (27)
Disposals (1) (8)
Exchange and other adjustments 10 (4)
Ending balance 293 288
Fixtures, fittings and equipment | Amortisation and impairment    
Changes in property, plant and equipment [abstract]    
Beginning balance (188) (204)
Fully depreciated assets written off 32 27
Disposals 1 8
Exchange and other adjustments (5) 3
Provided (24) (21)
System Fund expense (3) (4)
Impairment charge 0  
Impairment reversal   3
Ending balance $ (187) $ (188)