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Segmental information - Summary of Information by Reportable Segment - Other Segmental Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reportable segments [line items]      
Depreciation and amortisation $ 67 $ 65 $ 67
Contract assets deduction in revenue 52 43 37
Equity-settled share-based payments cost 42 37 31
Share of profit of associates and joint ventures (6) (10) (31)
Share of profit of associates (excluding exceptional items)     (13)
System fund and reimbursables depreciation and amortisation 79 80 83
Americas      
Disclosure of reportable segments [line items]      
Depreciation and amortisation 25 24 24
Contract assets deduction in revenue 30 24 21
Equity-settled share-based payments cost 13 10 9
Share of profit of associates and joint ventures 0 (4)  
Share of profit of associates (excluding exceptional items)     (5)
EMEAA      
Disclosure of reportable segments [line items]      
Depreciation and amortisation 13 12 12
Contract assets deduction in revenue 21 18 15
Equity-settled share-based payments cost 7 5 4
Share of profit of associates and joint ventures (6) (6)  
Share of profit of associates (excluding exceptional items)     (8)
Greater China      
Disclosure of reportable segments [line items]      
Depreciation and amortisation 3 3 4
Contract assets deduction in revenue 1 1 1
Equity-settled share-based payments cost 4 3 2
Share of profit of associates and joint ventures 0 0  
Share of profit of associates (excluding exceptional items)     0
Central      
Disclosure of reportable segments [line items]      
Depreciation and amortisation 26 26 27
Contract assets deduction in revenue 0 0 0
Equity-settled share-based payments cost 18 19 16
Share of profit of associates and joint ventures 0 0  
Share of profit of associates (excluding exceptional items)     0
Cost of sales in owned lease and managed lease hotels      
Disclosure of reportable segments [line items]      
Depreciation and amortisation 18 16 17
Cost of sales in other assets      
Disclosure of reportable segments [line items]      
Depreciation and amortisation $ 49 $ 49 $ 50