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System Fund and reimbursables - Summary of System Fund Revenues (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Loyalty programme revenues, net of the cost of point redemptions      
System Fund And Reimbursables [Line Items]      
Total revenue $ 355 $ 355 $ 379
Marketing, reservation and other hotel fees      
System Fund And Reimbursables [Line Items]      
Total revenue $ 1,362 $ 1,256 $ 1,185