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SEGMENT INFORMATION - Schedule of Segment Adjusted EBITDA to Income Before Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information        
Total revenues $ 1,786 $ 1,629 $ 5,312 $ 5,046
Stock-based compensation expense (14) (9) (59) (55)
Transaction and integration costs (25) (8) (130) (26)
Depreciation and amortization (83) (81) (245) (257)
Equity earnings (losses) from unconsolidated hospitality ventures (34) (13) (40) 32
Interest expense (90) (50) (230) (128)
Gains (losses) on sales of real estate and other 0 514 (2) 1,267
Asset impairments (9) (35) (23) (52)
Other income (loss), net (4) 70 68 152
Pro rata share of unconsolidated owned and leased hospitality ventures' Adjusted EBITDA (13) (14) (42) (48)
Income (loss) before income taxes (17) 608 73 1,611
Contra revenue        
Segment Reporting Information        
Total revenues (34) (27) (69) (56)
Revenues for reimbursed costs        
Segment Reporting Information        
Total revenues 903 867 2,734 2,511
Reimbursed costs        
Segment Reporting Information        
Reimbursed costs (905) (881) (2,756) (2,570)
Segment Adjusted EBITDA        
Segment Reporting Information        
Total revenues 1,807 1,642 5,362 5,101
Segment Adjusted EBITDA | Contra revenue        
Segment Reporting Information        
Total revenues (34) (27) (69) (56)
Segment Adjusted EBITDA | Revenues for reimbursed costs        
Segment Reporting Information        
Total revenues 903 867 2,734 2,511
Segment Adjusted EBITDA | Segment Total        
Segment Reporting Information        
Segment Adjusted EBITDA 330 311 987 959
Unallocated overhead expenses        
Segment Reporting Information        
Segment Adjusted EBITDA (38) (36) (120) (119)
Eliminations        
Segment Reporting Information        
Segment Adjusted EBITDA (1) 0 0 1
Total revenues (21) (13) (50) (55)
Eliminations | Contra revenue        
Segment Reporting Information        
Total revenues 0 0 0 0
Eliminations | Revenues for reimbursed costs        
Segment Reporting Information        
Total revenues $ 0 $ 0 $ 0 $ 0