Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition (Disaggregation of Net Revenues) (Details)

v3.10.0.1
Revenue Recognition (Disaggregation of Net Revenues) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]          
Net Revenues $ 604 $ 347 $ 1,341 $ 967 $ 1,280
Royalties and franchise fees          
Disaggregation of Revenue [Line Items]          
Net Revenues 138 107 332 277 364
Marketing, reservation and loyalty          
Disaggregation of Revenue [Line Items]          
Net Revenues 151 109 359 282 371
License and other revenues from former Parent          
Disaggregation of Revenue [Line Items]          
Net Revenues 36 20 79 56  
Cost reimbursements          
Disaggregation of Revenue [Line Items]          
Net Revenues 219 64 398 199  
Other          
Disaggregation of Revenue [Line Items]          
Net Revenues 28 25 83 75 $ 98
Reportable Segments          
Disaggregation of Revenue [Line Items]          
Net Revenues 600 347 1,337 967  
Reportable Segments | Hotel Franchising          
Disaggregation of Revenue [Line Items]          
Net Revenues 348 258 840 682  
Reportable Segments | Hotel Franchising | Royalties and franchise fees          
Disaggregation of Revenue [Line Items]          
Net Revenues 137 104 326 271  
Reportable Segments | Hotel Franchising | Marketing, reservation and loyalty          
Disaggregation of Revenue [Line Items]          
Net Revenues 151 109 357 281  
Reportable Segments | Hotel Franchising | License and other revenues from former Parent          
Disaggregation of Revenue [Line Items]          
Net Revenues 36 20 79 56  
Reportable Segments | Hotel Franchising | Other          
Disaggregation of Revenue [Line Items]          
Net Revenues 24 25 78 74  
Reportable Segments | Hotel Management          
Disaggregation of Revenue [Line Items]          
Net Revenues 252 89 497 285  
Reportable Segments | Hotel Management | Royalties and franchise fees          
Disaggregation of Revenue [Line Items]          
Net Revenues 1 3 6 6  
Reportable Segments | Hotel Management | Marketing, reservation and loyalty          
Disaggregation of Revenue [Line Items]          
Net Revenues 0 0 2 1  
Reportable Segments | Hotel Management | Hotel management - owned properties          
Disaggregation of Revenue [Line Items]          
Net Revenues 17 16 58 60  
Reportable Segments | Hotel Management | Hotel management - managed properties          
Disaggregation of Revenue [Line Items]          
Net Revenues 15 6 32 18  
Reportable Segments | Hotel Management | Cost reimbursements          
Disaggregation of Revenue [Line Items]          
Net Revenues 219 64 398 199  
Reportable Segments | Hotel Management | Other          
Disaggregation of Revenue [Line Items]          
Net Revenues 0 0 1 1  
Corporate and Other          
Disaggregation of Revenue [Line Items]          
Net Revenues $ 4 $ 0 $ 4 $ 0