Business Segments - Reconciliation of Adjusted EBITDA from Segments to Consolidated Income Before Income Taxes (Details) $ in Millions |
3 Months Ended | 9 Months Ended | ||||||||||||
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Sep. 30, 2026
USD ($)
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Sep. 30, 2025
USD ($)
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Sep. 30, 2026
USD ($)
segment
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Sep. 30, 2025
USD ($)
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| Reconciliation of Adjusted EBITDA from Segments to Consolidated Income [Line Items] | ||||||||||||||
| Number of operating segments | segment | 2 | |||||||||||||
| Segment Adjusted EBITDA | $ 1,053 | $ 979 | $ 3,015 | $ 2,789 | ||||||||||
| Corporate and other adjusted earnings before interest tax depreciation and amortization | [1] | 5 | (3) | (2) | (10) | |||||||||
| Interest expense | (184) | (159) | (529) | (455) | ||||||||||
| Depreciation and amortization expenses | (52) | (46) | (151) | (130) | ||||||||||
| Loss on foreign currency transactions | (7) | (9) | (19) | (8) | ||||||||||
| FF&E replacement reserves | (17) | (18) | (40) | (50) | ||||||||||
| Share-based compensation expense | (59) | (44) | (165) | (135) | ||||||||||
| Amortization of contract acquisition costs | (16) | (15) | (48) | (42) | ||||||||||
| Cost reimbursement revenues | [2] | 1,967 | 1,837 | 5,704 | 5,278 | |||||||||
| Reimbursed expenses | [2] | (1,951) | (1,902) | (5,808) | (5,556) | |||||||||
| Other adjustment items | [3] | (17) | (16) | (37) | (38) | |||||||||
| Income before income taxes | 722 | 604 | 1,920 | 1,643 | ||||||||||
| Management and Franchise | ||||||||||||||
| Reconciliation of Adjusted EBITDA from Segments to Consolidated Income [Line Items] | ||||||||||||||
| Segment Adjusted EBITDA | [4],[5] | 1,012 | 928 | 2,914 | 2,673 | |||||||||
| Ownership | ||||||||||||||
| Reconciliation of Adjusted EBITDA from Segments to Consolidated Income [Line Items] | ||||||||||||||
| Segment Adjusted EBITDA | [4],[5] | 41 | 51 | 101 | 116 | |||||||||
| Operating lease, expense | 52 | 55 | 145 | 157 | ||||||||||
| Other cost and expense, operating | $ 215 | $ 220 | $ 626 | $ 623 | ||||||||||
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