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Goodwill (Tables)
 3 Months Ended
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 SolutionsBuilding Operations & ExperienceProject ManagementReal Estate InvestmentsTotal 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 movement17 — 27 19 4 67 
Balance as of March 31, 2025$2,323 $— $2,177 $1,345 $415 $6,260