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Operating exceptional items - Additional Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
hotel
Dec. 31, 2023
USD ($)
Disclosure Of Exceptional Items [line items]      
Number of hotels | hotel   1  
Exceptional items      
Disclosure Of Exceptional Items [line items]      
Expense of restructuring activities $ 12 $ 0 $ 0
Impairment reversal on financial assets 0 6 0
Impairment reversal 0 3 0
Reversal of impairment contract assets 0 $ 3 $ 0
Exceptional items | System Fund      
Disclosure Of Exceptional Items [line items]      
Expense of restructuring activities $ 10