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Goodwill (Tables)
 6 Months Ended
Jun. 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 — — 
Acquisitions3 — 566 — — 569 
Foreign exchange movement64 — 84 59 13 220 
Balance as of June 30, 2025$2,373 $— $2,228 $1,385 $424 $6,410 
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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, Building Operations & Experience, Project Management, and Real Estate Investment segments, respectively.