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Goodwill and Other Intangible Assets - Schedule of Changes in Goodwill by Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Roll Forward]      
Goodwill, gross, beginning balance $ 6,249 $ 5,988  
Accumulated impairment losses (1,120) (1,120) $ (1,120)
Goodwill, beginning balance 5,129 4,868  
Acquisitions 597 187  
Foreign exchange movement (105) 74  
Goodwill, gross, ending balance 6,741 6,249  
Goodwill, ending balance 5,621 5,129  
Advisory Services      
Goodwill [Roll Forward]      
Goodwill, gross, beginning balance 3,383 3,283  
Accumulated impairment losses (762) (762) (762)
Goodwill, beginning balance 2,621 2,521  
Acquisitions 8 91  
Foreign exchange movement (33) 9  
Goodwill, gross, ending balance 3,358 3,383  
Goodwill, ending balance 2,596 2,621  
Global Workplace Solutions      
Goodwill [Roll Forward]      
Goodwill, gross, beginning balance 2,260 2,110  
Accumulated impairment losses (175) (175) (175)
Goodwill, beginning balance 2,085 1,935  
Acquisitions 589 93  
Foreign exchange movement (60) 57  
Goodwill, gross, ending balance 2,789 2,260  
Goodwill, ending balance 2,614 2,085  
Real Estate Investments      
Goodwill [Roll Forward]      
Goodwill, gross, beginning balance 606 595  
Accumulated impairment losses (183) (183) $ (183)
Goodwill, beginning balance 423 412  
Acquisitions 0 3  
Foreign exchange movement (12) 8  
Goodwill, gross, ending balance 594 606  
Goodwill, ending balance $ 411 $ 423