Quarterly report pursuant to Section 13 or 15(d)

Acquisitions Narrative (Details)

v3.21.2
Acquisitions Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 26 Months Ended
Jan. 05, 2021
Aug. 07, 2019
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Business Acquisition [Line Items]              
Payments to acquire business         $ 37 $ 0  
Travel + Leisure              
Business Acquisition [Line Items]              
Business Combination, Consideration Transferred $ 100            
Payments to acquire business $ 35     $ 20      
Alliance Reservations Network | Travel and Membership              
Business Acquisition [Line Items]              
Business Combination, Consideration Transferred   $ 102          
Payments to acquire business     $ 11       $ 70
business combination, consideration transferred, net of cash acquired   $ 97          
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned     $ 24   $ 24   $ 24
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares             721,450
Business Acquisition, Share Price     $ 32.51   $ 32.51   $ 32.51
Business Combination, Contingent Consideration, Liability, Noncurrent     $ 10   $ 10   $ 10