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Acquisitions (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Jan. 05, 2021
Aug. 07, 2019
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Acquisitions [Line Items]            
Goodwill, Acquired During Period       $ 1    
Payments to acquire businesses, net of cash acquired       2 $ 37 $ 0
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability       (10) 0 0
Travel + Leisure brand [Member]            
Acquisitions [Line Items]            
Asset Acquisition, Consideration Transferred $ 100          
Cash used in Investing Activities | Travel + Leisure brand [Member]            
Acquisitions [Line Items]            
Payments to Acquire Productive Assets $ 35          
Cash used in Financing Activities | Travel + Leisure brand [Member]            
Acquisitions [Line Items]            
Payments to Acquire Productive Assets       20 20  
Travel and Membership            
Acquisitions [Line Items]            
Goodwill, Acquired During Period       1    
Other Acquisitions | Travel and Membership            
Acquisitions [Line Items]            
Acquisition price     $ 2      
Definite-lived intangibles     $ 1      
Finite-Lived Intangible Asset, Useful Life     7 years      
Goodwill, Acquired During Period     $ 1      
Deferred Revenue acquired     $ 1      
Alliance Reservations Network | Travel and Membership            
Acquisitions [Line Items]            
Acquisition price   $ 97        
Payments to acquire businesses   102        
Payments to acquire businesses, net of cash acquired   48     $ 11 $ 11
Stock value   $ 24        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares   721,450        
Business acquisition, Equity issued or issuable, price per share   $ 32.51        
Business Combination, Contingent Consideration, Liability   $ 10        
Alliance Reservations Network | Travel and Membership | Other Income            
Acquisitions [Line Items]            
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability       $ (10)