Annual report pursuant to Section 13 and 15(d)

Revenue Recognition (Disaggregation of Net Revenues) (Details)

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Revenue Recognition (Disaggregation of Net Revenues) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]                      
Net revenues $ 492 $ 560 $ 533 $ 468 $ 527 $ 604 $ 435 $ 302 $ 2,053 $ 1,868 $ 1,280
Royalties and franchise fees                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 480 441 364
Marketing, reservation and loyalty                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 562 491 371
License and other revenues from former Parent                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 131 111 75
Cost reimbursements                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 623 586 264
Other                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 132 115 98
Hotel Franchising                      
Disaggregation of Revenue [Line Items]                      
Net revenues 300 379 331 269 295 348 289 203      
Hotel Franchising | Royalties and franchise fees                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 465 432 355
Hotel Franchising | Marketing, reservation and loyalty                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 559 489 369
Hotel Franchising | License and other revenues from former Parent                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 131 111 75
Hotel Franchising | Other                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 124 103 98
Hotel Management                      
Disaggregation of Revenue [Line Items]                      
Net revenues $ 190 $ 180 $ 201 $ 197 $ 229 $ 252 $ 146 $ 99      
Hotel Management | Royalties and franchise fees                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 15 9 9
Hotel Management | Marketing, reservation and loyalty                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 3 2 2
Hotel Management | Hotel management - owned properties                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 89 75 78
Hotel Management | Hotel management - managed properties                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 36 49 30
Hotel Management | Cost reimbursements                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 623 586 264
Hotel Management | Other                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 2 5 0
Reportable Segments | Hotel Franchising                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 1,279 1,135 897
Reportable Segments | Hotel Management                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 768 726 383
Corporate and Other                      
Disaggregation of Revenue [Line Items]                      
Net revenues                 $ 6 $ 7 $ 0