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
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Net Revenues $ 371 $ 303
Royalties and franchise fees    
Disaggregation of Revenue [Line Items]    
Net Revenues 110 78
Marketing, reservation and loyalty    
Disaggregation of Revenue [Line Items]    
Net Revenues 111 85
Cost reimbursements    
Disaggregation of Revenue [Line Items]    
Net Revenues 55 71
Other    
Disaggregation of Revenue [Line Items]    
Net Revenues 41 30
Reportable Segments    
Disaggregation of Revenue [Line Items]    
Net Revenues 371 303
Reportable Segments | Hotel Franchising    
Disaggregation of Revenue [Line Items]    
Net Revenues 272 209
Reportable Segments | Hotel Franchising | Royalties and franchise fees    
Disaggregation of Revenue [Line Items]    
Net Revenues 103 75
Reportable Segments | Hotel Franchising | Marketing, reservation and loyalty    
Disaggregation of Revenue [Line Items]    
Net Revenues 111 85
Reportable Segments | Hotel Franchising | License and other fees    
Disaggregation of Revenue [Line Items]    
Net Revenues 19 20
Reportable Segments | Hotel Franchising | Other    
Disaggregation of Revenue [Line Items]    
Net Revenues 39 29
Reportable Segments | Hotel Management    
Disaggregation of Revenue [Line Items]    
Net Revenues 99 94
Reportable Segments | Hotel Management | Royalties and franchise fees    
Disaggregation of Revenue [Line Items]    
Net Revenues 7 3
Reportable Segments | Hotel Management | Owned hotel revenues    
Disaggregation of Revenue [Line Items]    
Net Revenues 30 13
Reportable Segments | Hotel Management | Management fees    
Disaggregation of Revenue [Line Items]    
Net Revenues 5 6
Reportable Segments | Hotel Management | Cost reimbursements    
Disaggregation of Revenue [Line Items]    
Net Revenues 55 71
Reportable Segments | Hotel Management | Other    
Disaggregation of Revenue [Line Items]    
Net Revenues $ 2 $ 1