Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition (Disaggregation of Net Revenues) (Details)

v3.8.0.1
Revenue Recognition (Disaggregation of Net Revenues) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Net Revenues $ 302 $ 289 $ 1,280
Royalties and franchise fees      
Disaggregation of Revenue [Line Items]      
Net Revenues 82 75 364
Marketing, reservation and loyalty      
Disaggregation of Revenue [Line Items]      
Net Revenues 84 77 371
License and other revenues from Parent      
Disaggregation of Revenue [Line Items]      
Net Revenues 17 16  
Cost reimbursements      
Disaggregation of Revenue [Line Items]      
Net Revenues 66 66  
Other      
Disaggregation of Revenue [Line Items]      
Net Revenues 23 26 $ 98
Reportable Segments      
Disaggregation of Revenue [Line Items]      
Net Revenues 302 289  
Reportable Segments | Hotel Franchising      
Disaggregation of Revenue [Line Items]      
Net Revenues 203 191  
Reportable Segments | Hotel Franchising | Royalties and franchise fees      
Disaggregation of Revenue [Line Items]      
Net Revenues 79 73  
Reportable Segments | Hotel Franchising | Marketing, reservation and loyalty      
Disaggregation of Revenue [Line Items]      
Net Revenues 84 77  
Reportable Segments | Hotel Franchising | License and other revenues from Parent      
Disaggregation of Revenue [Line Items]      
Net Revenues 17 16  
Reportable Segments | Hotel Franchising | Other      
Disaggregation of Revenue [Line Items]      
Net Revenues 23 25  
Reportable Segments | Hotel Management      
Disaggregation of Revenue [Line Items]      
Net Revenues 99 98  
Reportable Segments | Hotel Management | Owned      
Disaggregation of Revenue [Line Items]      
Net Revenues 23 23  
Reportable Segments | Hotel Management | Managed      
Disaggregation of Revenue [Line Items]      
Net Revenues 7 7  
Reportable Segments | Hotel Management | Royalties and franchise fees      
Disaggregation of Revenue [Line Items]      
Net Revenues 3 2  
Reportable Segments | Hotel Management | Cost reimbursements      
Disaggregation of Revenue [Line Items]      
Net Revenues $ 66 $ 66