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 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]          
Net Revenues $ 435 $ 331 $ 737 $ 620 $ 1,280
Royalties and franchise fees          
Disaggregation of Revenue [Line Items]          
Net Revenues 113 95 194 170 364
Marketing, reservation and loyalty          
Disaggregation of Revenue [Line Items]          
Net Revenues 124 96 208 173 371
License and other revenues from former Parent          
Disaggregation of Revenue [Line Items]          
Net Revenues 25 20 43 36  
Cost reimbursements          
Disaggregation of Revenue [Line Items]          
Net Revenues 114 69 180 136  
Other          
Disaggregation of Revenue [Line Items]          
Net Revenues 31 24 54 49 $ 98
Reportable Segments          
Disaggregation of Revenue [Line Items]          
Net Revenues 435 331 737 620  
Reportable Segments | Hotel Franchising          
Disaggregation of Revenue [Line Items]          
Net Revenues 289 233 491 424  
Reportable Segments | Hotel Franchising | Royalties and franchise fees          
Disaggregation of Revenue [Line Items]          
Net Revenues 110 93 189 166  
Reportable Segments | Hotel Franchising | Marketing, reservation and loyalty          
Disaggregation of Revenue [Line Items]          
Net Revenues 124 96 207 173  
Reportable Segments | Hotel Franchising | License and other revenues from former Parent          
Disaggregation of Revenue [Line Items]          
Net Revenues 25 20 43 36  
Reportable Segments | Hotel Franchising | Other          
Disaggregation of Revenue [Line Items]          
Net Revenues 30 24 52 49  
Reportable Segments | Hotel Management          
Disaggregation of Revenue [Line Items]          
Net Revenues 146 98 246 196  
Reportable Segments | Hotel Management | Owned          
Disaggregation of Revenue [Line Items]          
Net Revenues 19 21 42 44  
Reportable Segments | Hotel Management | Managed          
Disaggregation of Revenue [Line Items]          
Net Revenues 9 6 16 12  
Reportable Segments | Hotel Management | Royalties and franchise fees          
Disaggregation of Revenue [Line Items]          
Net Revenues 3 2 6 4  
Reportable Segments | Hotel Management | Cost reimbursements          
Disaggregation of Revenue [Line Items]          
Net Revenues 114 69 180 136  
Reportable Segments | Hotel Management | Other          
Disaggregation of Revenue [Line Items]          
Net Revenues $ 1 $ 0 $ 2 $ 0