Annual report pursuant to Section 13 and 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 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]                      
Net revenues $ 527 $ 604 $ 435 $ 302 $ 312 $ 347 $ 331 $ 289 $ 1,868 $ 1,280 $ 1,269
Royalties and franchise fees                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 441 364 354
Marketing, reservation and loyalty                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 491 371 375
License and other revenues from former Parent                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 111 75 65
Cost reimbursements                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 586 264 271
Other                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 115 98 97
Hotel Franchising                      
Disaggregation of Revenue [Line Items]                      
Net revenues 295 348 289 203 215 258 233 191      
Hotel Management                      
Disaggregation of Revenue [Line Items]                      
Net revenues $ 229 $ 252 $ 146 $ 99 $ 97 $ 89 $ 98 $ 98      
Reportable Segments | Hotel Franchising                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 1,135 897 881
Reportable Segments | Hotel Franchising | Royalties and franchise fees                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 432 355 347
Reportable Segments | Hotel Franchising | Marketing, reservation and loyalty                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 489 369 373
Reportable Segments | Hotel Franchising | License and other revenues from former Parent                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 111 75 65
Reportable Segments | Hotel Franchising | Other                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 103 98 96
Reportable Segments | Hotel Management                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 726 383 388
Reportable Segments | Hotel Management | Royalties and franchise fees                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 9 9 7
Reportable Segments | Hotel Management | Marketing, reservation and loyalty                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 2 2 2
Reportable Segments | Hotel Management | Hotel management - owned properties                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 75 78 81
Reportable Segments | Hotel Management | Hotel management - managed properties                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 49 30 26
Reportable Segments | Hotel Management | Cost reimbursements                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 586 264 271
Reportable Segments | Hotel Management | Other                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 5 0 1
Corporate and Other                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 $ 7 $ 0 $ 0