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System Fund and reimbursables - Summary of System Fund Expenses (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
System Fund And Reimbursables [Line Items]      
Depreciation and amortisation $ 80 $ 83 $ 86
Impairment loss on trade receivables 10 (1) 5
System Fund [member]      
System Fund And Reimbursables [Line Items]      
Marketing 520 498 408
Depreciation and amortisation 80 83 86
Impairment loss on trade receivables 9   7
Other net impairment charges 3    
Costs are borne by the System Fund [member] | System Fund [member]      
System Fund And Reimbursables [Line Items]      
Staff costs $ 436 $ 399 $ 341