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Goodwill and Other Intangible Assets - Summary of Carrying Value of Goodwill and Indefinite Life Brands Allocated to Cash-generating Units for Impairment Testing (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of information for cash-generating units [Line Items]    
Goodwill $ 313 $ 237
Brands 250 193
Americas Managed [member]    
Disclosure of information for cash-generating units [Line Items]    
Goodwill 69 63
Brands 203 193
Americas franchised [member]    
Disclosure of information for cash-generating units [Line Items]    
Goodwill 37 37
Brands 0  
Europe Middle East Asia and Africa Europe managed [member]    
Disclosure of information for cash-generating units [Line Items]    
Goodwill 29 21
Brands 13  
Europe Middle East Asia and Africa Europe franchised [member]    
Disclosure of information for cash-generating units [Line Items]    
Goodwill 10 10
Brands 0  
Europe Middle East Asia and Africa rest of region [member]    
Disclosure of information for cash-generating units [Line Items]    
Goodwill 113 106
Brands 23  
Greater China [member]    
Disclosure of information for cash-generating units [Line Items]    
Goodwill 7  
Brands 11  
UK Leased portfolio [member]    
Disclosure of information for cash-generating units [Line Items]    
Goodwill 48  
Brands 0  
Cash-generating units [member]    
Disclosure of information for cash-generating units [Line Items]    
Goodwill 265 237
Brands $ 250 $ 193