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Goodwill (Tables) | 3 Months Ended
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Mar. 31, 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 | $ | 2,596 |  |  | $ | 2,614 |  |  | $ | — |  |  | $ | — |  |  | $ | 411 |  |  | $ | 5,621 |
Reallocation | (290) |  |  | (2,614) |  |  | 1,578 |  |  | 1,326 |  |  | — |  |  | — |
Acquisitions | — |  |  | — |  |  | 572 |  |  | — |  |  | — |  |  | 572 |
Impairment | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Foreign exchange movement | 17 |  |  | — |  |  | 27 |  |  | 19 |  |  | 4 |  |  | 67 |
Balance as of March 31, 2025 | $ | 2,323 |  |  | $ | — |  |  | $ | 2,177 |  |  | $ | 1,345 |  |  | $ | 415 |  |  | $ | 6,260 |

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