Quarterly report pursuant to Section 13 or 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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Line Items]        
Net Revenues $ 386 $ 406 $ 757 $ 709
Royalties and franchise fees        
Disaggregation of Revenue [Line Items]        
Net Revenues 133 122 242 200
Marketing, reservation and loyalty        
Disaggregation of Revenue [Line Items]        
Net Revenues 145 119 257 204
Cost reimbursements        
Disaggregation of Revenue [Line Items]        
Net Revenues 32 85 88 155
Other        
Disaggregation of Revenue [Line Items]        
Net Revenues 33 30 73 60
Reportable Segments        
Disaggregation of Revenue [Line Items]        
Net Revenues 386 406 757 709
Reportable Segments | Hotel Franchising        
Disaggregation of Revenue [Line Items]        
Net Revenues 335 283 606 492
Reportable Segments | Hotel Franchising | Royalties and franchise fees        
Disaggregation of Revenue [Line Items]        
Net Revenues 131 115 232 190
Reportable Segments | Hotel Franchising | Marketing, reservation and loyalty        
Disaggregation of Revenue [Line Items]        
Net Revenues 145 119 257 204
Reportable Segments | Hotel Franchising | License and other fees        
Disaggregation of Revenue [Line Items]        
Net Revenues 27 20 46 40
Reportable Segments | Hotel Franchising | Other        
Disaggregation of Revenue [Line Items]        
Net Revenues 32 29 71 58
Reportable Segments | Hotel Management        
Disaggregation of Revenue [Line Items]        
Net Revenues 51 123 151 217
Reportable Segments | Hotel Management | Royalties and franchise fees        
Disaggregation of Revenue [Line Items]        
Net Revenues 2 7 10 10
Reportable Segments | Hotel Management | Owned hotel revenues        
Disaggregation of Revenue [Line Items]        
Net Revenues 13 21 42 34
Reportable Segments | Hotel Management | Management fees        
Disaggregation of Revenue [Line Items]        
Net Revenues 3 9 9 16
Reportable Segments | Hotel Management | Cost reimbursements        
Disaggregation of Revenue [Line Items]        
Net Revenues 32 85 88 155
Reportable Segments | Hotel Management | Other        
Disaggregation of Revenue [Line Items]        
Net Revenues $ 1 $ 1 $ 2 $ 2