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REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Contract Liability (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Disaggregation of Revenue [Line Items]    
Total contract liabilities $ 2,290 $ 2,396
Deferred revenue related to the loyalty program    
Disaggregation of Revenue [Line Items]    
Total contract liabilities 1,512 1,333
Deferred revenue related to distribution and destination management services    
Disaggregation of Revenue [Line Items]    
Total contract liabilities 480 705
Deferred revenue related to co-branded credit card programs    
Disaggregation of Revenue [Line Items]    
Total contract liabilities 77 66
Advanced deposits    
Disaggregation of Revenue [Line Items]    
Total contract liabilities 66 53
Initial fees received from franchise owners    
Disaggregation of Revenue [Line Items]    
Total contract liabilities 49 47
Deferred revenue related to insurance programs    
Disaggregation of Revenue [Line Items]    
Total contract liabilities 17 112
Other deferred revenue    
Disaggregation of Revenue [Line Items]    
Total contract liabilities $ 89 $ 80