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Goodwill and other intangible assets - Summary of Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Changes in intangible assets and goodwill [abstract]    
Beginning balance $ 1,042 $ 1,099
Ending balance 1,155 1,042
Goodwill    
Changes in intangible assets and goodwill [abstract]    
Beginning balance 331 336
Ending balance 335 331
Brands    
Changes in intangible assets and goodwill [abstract]    
Beginning balance 439 439
Ending balance 590 439
Software    
Changes in intangible assets and goodwill [abstract]    
Beginning balance 247 297
Ending balance 208 247
Management agreements    
Changes in intangible assets and goodwill [abstract]    
Beginning balance 18 19
Ending balance 16 18
Other intangibles    
Changes in intangible assets and goodwill [abstract]    
Beginning balance 7 8
Ending balance 6 7
Cost    
Changes in intangible assets and goodwill [abstract]    
Beginning balance 1,916 1,926
Additions 185 49
Fully amortised assets written off (87) (50)
Disposals   (4)
Exchange and other adjustments 24 (5)
Ending balance 2,038 1,916
Cost | Goodwill    
Changes in intangible assets and goodwill [abstract]    
Beginning balance 511 516
Additions 0 0
Fully amortised assets written off 0 0
Disposals   0
Exchange and other adjustments 7 (5)
Ending balance 518 511
Cost | Brands    
Changes in intangible assets and goodwill [abstract]    
Beginning balance 439 439
Additions 136 0
Fully amortised assets written off 0 0
Disposals   0
Exchange and other adjustments 15 0
Ending balance 590 439
Cost | Software    
Changes in intangible assets and goodwill [abstract]    
Beginning balance 820 825
Additions 49 48
Fully amortised assets written off (87) (49)
Disposals   (4)
Exchange and other adjustments 1 0
Ending balance 783 820
Cost | Management agreements    
Changes in intangible assets and goodwill [abstract]    
Beginning balance 122 122
Additions 0 0
Fully amortised assets written off 0 0
Disposals   0
Exchange and other adjustments 0 0
Ending balance 122 122
Cost | Other intangibles    
Changes in intangible assets and goodwill [abstract]    
Beginning balance 24 24
Additions 0 1
Fully amortised assets written off 0 (1)
Disposals   0
Exchange and other adjustments 1 0
Ending balance 25 24
Amortisation and impairment    
Changes in intangible assets and goodwill [abstract]    
Beginning balance (874) (827)
Fully amortised assets written off 87 50
Disposals   4
Exchange and other adjustments (5) 1
Provided (16) (19)
System Fund expense (75) (78)
Impairment charge   (2)
System Fund impairment charge   (3)
Ending balance (883) (874)
Amortisation and impairment | Goodwill    
Changes in intangible assets and goodwill [abstract]    
Beginning balance (180) (180)
Fully amortised assets written off 0 0
Disposals   0
Exchange and other adjustments (3) 0
Provided 0 0
System Fund expense 0 0
Impairment charge   0
System Fund impairment charge   0
Ending balance (183) (180)
Amortisation and impairment | Brands    
Changes in intangible assets and goodwill [abstract]    
Beginning balance 0 0
Fully amortised assets written off 0 0
Disposals   0
Exchange and other adjustments 0 0
Provided 0 0
System Fund expense 0 0
Impairment charge   0
System Fund impairment charge   0
Ending balance 0 0
Amortisation and impairment | Software    
Changes in intangible assets and goodwill [abstract]    
Beginning balance (573) (528)
Fully amortised assets written off 87 49
Disposals   4
Exchange and other adjustments 0 1
Provided (14) (17)
System Fund expense (75) (77)
Impairment charge   (2)
System Fund impairment charge   (3)
Ending balance (575) (573)
Amortisation and impairment | Management agreements    
Changes in intangible assets and goodwill [abstract]    
Beginning balance (104) (103)
Fully amortised assets written off 0 0
Disposals   0
Exchange and other adjustments (1) 0
Provided (1) (1)
System Fund expense 0 0
Impairment charge   0
System Fund impairment charge   0
Ending balance (106) (104)
Amortisation and impairment | Other intangibles    
Changes in intangible assets and goodwill [abstract]    
Beginning balance (17) (16)
Fully amortised assets written off 0 1
Disposals   0
Exchange and other adjustments (1) 0
Provided (1) (1)
System Fund expense 0 (1)
Impairment charge   0
System Fund impairment charge   0
Ending balance $ (19) $ (17)