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Goodwill (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes in Goodwill by Segment | We determined that no impairment existed as the estimated fair values of our reporting units were in excess of their respective carrying values, both before and after the reorganization.
| Advisory Services |  | Global Workplace Solutions |  | Building Operations & Experience |  | Project Management |  | Real Estate Investments |  | Total Consolidated
Balance as of December 31, 2024 (1) | $ | 2,596 |  |  | $ | 2,614 |  |  | $ | — |  |  | $ | — |  |  | $ | 411 |  |  | $ | 5,621 |
Reallocation | (290) |  |  | (2,614) |  |  | 1,578 |  |  | 1,326 |  |  | — |  |  | — |
Acquisitions | 24 |  |  | — |  |  | 566 |  |  | — |  |  | — |  |  | 590 |
Foreign exchange movement | 55 |  |  | — |  |  | 74 |  |  | 49 |  |  | 11 |  |  | 189 |
Balance as of September 30, 2025 | $ | 2,385 |  |  | $ | — |  |  | $ | 2,218 |  |  | $ | 1,375 |  |  | $ | 422 |  |  | $ | 6,400 |
________________________________________________________________________________________________________________________________________ (1) Beginning goodwill balance is presented net of prior accumulated impairment losses of $673 million, $175 million, $89 million, and $183 million related to the Advisory Services, BOE, Project Management, and REI segments, respectively.

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