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System Fund and reimbursables - Summary of System Fund Revenues (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
System Fund And Reimbursables [Line Items]      
System Fund revenues $ 1,611 $ 1,564 $ 1,217
Loyalty programme revenues, net of the cost of point redemptions [member]      
System Fund And Reimbursables [Line Items]      
System Fund revenues 355 379 228
Marketing, reservation and other hotel fees [member]      
System Fund And Reimbursables [Line Items]      
System Fund revenues $ 1,256 $ 1,185 $ 989