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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue $ 8,850 $ 7,730 $ 24,903 $ 22,632
Total Out of Scope of Topic 606 Revenue 186 138 460 367
Total Revenue 9,036 7,868 25,363 22,999
Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue (7) (4) (16) (12)
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue (7) (4) (16) (12)
Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 2,211 1,882 6,064 5,552
Total Out of Scope of Topic 606 Revenue 184 131 454 356
Total Revenue 2,395 2,013 6,518 5,908
Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 6,346 5,649 18,099 16,413
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue 6,346 5,649 18,099 16,413
Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 300 203 756 679
Total Out of Scope of Topic 606 Revenue 2 7 6 11
Total Revenue 302 210 762 690
Facilities management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 4,370 3,844 12,563 11,210
Facilities management | Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 4,370 3,844 12,563 11,210
Project management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,976 1,805 5,536 5,203
Project management | Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,976 1,805 5,536 5,203
Advisory leasing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 984 827 2,607 2,350
Advisory leasing | Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 0 0 0 0
Advisory leasing | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 984 827 2,607 2,350
Advisory sales        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 422 370 1,133 1,135
Advisory sales | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 422 370 1,133 1,135
Property management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 560 461 1,604 1,397
Property management | Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue (7) (4) (16) (12)
Property management | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 567 465 1,620 1,409
Valuation        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 178 163 528 508
Valuation | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 178 163 528 508
Commercial mortgage origination        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 44 37 117 94
Total Out of Scope of Topic 606 Revenue 119 70 266 174
Commercial mortgage origination | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 44 37 117 94
Total Out of Scope of Topic 606 Revenue 119 70 266 174
Loan servicing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 16 20 59 56
Total Out of Scope of Topic 606 Revenue 65 61 188 182
Loan servicing | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 16 20 59 56
Total Out of Scope of Topic 606 Revenue 65 61 188 182
Investment management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 196 137 494 436
Investment management | Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 196 137 494 436
Development services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 104 66 262 243
Total Out of Scope of Topic 606 Revenue 2 7 6 11
Development services | Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 104 66 262 243
Total Out of Scope of Topic 606 Revenue $ 2 $ 7 $ 6 $ 11