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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Defined Contribution Plan and Deferred Compensation Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award      
Defined contribution plan, cost $ 24 $ 24 $ 23
Deferred Compensation Plan | Marriott International      
Share-based Compensation Arrangement by Share-based Payment Award      
Minimum required fixed rate of return 3.50% 3.50%