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Leases - Summary of Right-of-use Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in right-of-use assets [abstract]      
Beginning balance, Right-of-use assets $ 276 $ 273  
Provided 24 22 $ 22
System Fund expense 1 (2) 2
Ending balance, Right-of-use assets 269 276 273
Cost      
Reconciliation of changes in right-of-use assets [abstract]      
Beginning balance, Right-of-use assets 574 589  
Additions and other remeasurements 17 33  
Transfers to finance lease receivable   (31)  
Terminations (2) (12)  
Exchange and other adjustments 8 (5)  
Ending balance, Right-of-use assets 597 574 589
Amortisation and impairment      
Reconciliation of changes in right-of-use assets [abstract]      
Beginning balance, Right-of-use assets (298) (316)  
Provided (24) (22)  
System Fund expense (1) 2  
Impairment charge (1)    
Transfers to finance lease receivable   21  
Terminations 2 12  
Exchange and other adjustments (6) 5  
Ending balance, Right-of-use assets (328) (298) (316)
Land and buildings      
Reconciliation of changes in right-of-use assets [abstract]      
Beginning balance, Right-of-use assets 272 268  
Ending balance, Right-of-use assets 265 272 268
Land and buildings | Cost      
Reconciliation of changes in right-of-use assets [abstract]      
Beginning balance, Right-of-use assets 533 534  
Additions and other remeasurements 16 28  
Transfers to finance lease receivable   (13)  
Terminations (2) (11)  
Exchange and other adjustments 8 (5)  
Ending balance, Right-of-use assets 555 533 534
Land and buildings | Amortisation and impairment      
Reconciliation of changes in right-of-use assets [abstract]      
Beginning balance, Right-of-use assets (261) (266)  
Provided (23) (21)  
System Fund expense (1) 2  
Impairment charge (1)    
Transfers to finance lease receivable   8  
Terminations 2 11  
Exchange and other adjustments (6) 5  
Ending balance, Right-of-use assets (290) (261) (266)
Investment property      
Reconciliation of changes in right-of-use assets [abstract]      
Beginning balance, Right-of-use assets 2 3  
Ending balance, Right-of-use assets 2 2 3
Investment property | Cost      
Reconciliation of changes in right-of-use assets [abstract]      
Beginning balance, Right-of-use assets 38 52  
Additions and other remeasurements 0 0  
Transfers to finance lease receivable   (14)  
Terminations 0 0  
Exchange and other adjustments 0 0  
Ending balance, Right-of-use assets 38 38 52
Investment property | Amortisation and impairment      
Reconciliation of changes in right-of-use assets [abstract]      
Beginning balance, Right-of-use assets (36) (49)  
Provided 0 0  
System Fund expense 0 0  
Impairment charge 0    
Transfers to finance lease receivable   13  
Terminations 0 0  
Exchange and other adjustments 0 0  
Ending balance, Right-of-use assets (36) (36) (49)
Other      
Reconciliation of changes in right-of-use assets [abstract]      
Beginning balance, Right-of-use assets 2 2  
Ending balance, Right-of-use assets 2 2 2
Other | Cost      
Reconciliation of changes in right-of-use assets [abstract]      
Beginning balance, Right-of-use assets 3 3  
Additions and other remeasurements 1 5  
Transfers to finance lease receivable   (4)  
Terminations 0 (1)  
Exchange and other adjustments 0 0  
Ending balance, Right-of-use assets 4 3 3
Other | Amortisation and impairment      
Reconciliation of changes in right-of-use assets [abstract]      
Beginning balance, Right-of-use assets (1) (1)  
Provided (1) (1)  
System Fund expense 0 0  
Impairment charge 0    
Transfers to finance lease receivable   0  
Terminations 0 1  
Exchange and other adjustments 0 0  
Ending balance, Right-of-use assets $ (2) $ (1) $ (1)