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SEGMENT INFORMATION - Schedule of Segment Adjusted EBITDA to Income Before Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information |  |  |  |
Total revenues | $ 1,808 | $ 1,703 | $ 3,526 | $ 3,417
Stock-based compensation expense | (14) | (15) | (45) | (46)
Transaction and integration costs | (82) | (10) | (105) | (18)
Depreciation and amortization | (82) | (84) | (162) | (176)
Equity earnings (losses) from unconsolidated hospitality ventures | 6 | (30) | (6) | 45
Interest expense | (74) | (40) | (140) | (78)
Gains (losses) on sales of real estate and other | (2) | 350 | (2) | 753
Asset impairments | (10) | 0 | (14) | (17)
Other income (loss), net | 29 | 28 | 72 | 82
Pro rata share of unconsolidated owned and leased hospitality ventures' Adjusted EBITDA | (17) | (17) | (29) | (34)
Income before income taxes | 38 | 462 | 90 | 1,003
Contra revenue |  |  |  |
Segment Reporting Information |  |  |  |
Total revenues | (15) | (16) | (35) | (29)
Revenues for reimbursed costs |  |  |  |
Segment Reporting Information |  |  |  |
Total revenues | 945 | 842 | 1,831 | 1,644
Reimbursed costs |  |  |  |
Segment Reporting Information |  |  |  |
Reimbursed costs | (949) | (853) | (1,851) | (1,689)
Segment Adjusted EBITDA |  |  |  |
Segment Reporting Information |  |  |  |
Total revenues | 1,824 | 1,723 | 3,555 | 3,459
Segment Adjusted EBITDA | Contra revenue |  |  |  |
Segment Reporting Information |  |  |  |
Total revenues | (15) | (16) | (35) | (29)
Segment Adjusted EBITDA | Revenues for reimbursed costs |  |  |  |
Segment Reporting Information |  |  |  |
Total revenues | 945 | 842 | 1,831 | 1,644
Segment Adjusted EBITDA | Segment Total |  |  |  |
Segment Reporting Information |  |  |  |
Segment Adjusted EBITDA | 345 | 344 | 657 | 648
Unallocated overhead expenses |  |  |  |
Segment Reporting Information |  |  |  |
Segment Adjusted EBITDA | (42) | (37) | (82) | (83)
Eliminations |  |  |  |
Segment Reporting Information |  |  |  |
Segment Adjusted EBITDA | 0 | 0 | 1 | 1
Total revenues | (16) | (20) | (29) | (42)
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

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