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Goodwill (Tables)
 9 Months Ended
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 SolutionsBuilding Operations & ExperienceProject ManagementReal Estate InvestmentsTotal Consolidated
Balance as of December 31, 2024 (1)
$2,596 $2,614 $— $— $411 $5,621 
Reallocation(290)(2,614)1,578 1,326 — — 
Acquisitions24 — 566 — — 590 
Foreign exchange movement55 — 74 49 11 189 
Balance as of September 30, 2025$2,385 $— $2,218 $1,375 $422 $6,400 
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(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.