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Property, plant and equipment - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Hotel
Dec. 31, 2019
Hotel
Disclosure of detailed information about property, plant and equipment [line items]    
Number of open hotels | Hotel 23 26
Impairment loss recognised in profit or loss, property, plant and equipment $ 90  
Property Plant And Equipment System Fund Impairment Charge 5  
US corporate headquarters [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Impairment loss recognised in profit or loss, property, plant and equipment 7  
US corporate headquarters [Member] | System Fund [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Impairment loss recognised in profit or loss, property, plant and equipment 5  
Development Land Sites [Member] | Americas [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Impairment loss recognised in profit or loss, property, plant and equipment 3  
UK Portfolio [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Impairment loss recognised in profit or loss, property, plant and equipment 50  
Three Hotels In North America [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Impairment loss recognised in profit or loss, property, plant and equipment $ 35