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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue $ 9,584 $ 8,258 $ 18,344 $ 16,082
Total Out of Scope of Topic 606 Revenue 170 133 319 244
Total Revenue 9,754 8,391 18,663 16,326
Facilities management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 5,119 4,360 9,887 8,626
Project management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,786 1,563 3,417 3,082
Advisory leasing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 995 875 1,857 1,607
Advisory sales        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 460 384 819 709
Property management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 638 492 1,221 920
Valuation        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 196 184 379 351
Other portfolio services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 96 92 178 185
Commercial mortgage origination        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 58 44 99 75
Total Out of Scope of Topic 606 Revenue 69 44 116 72
Loan servicing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 21 35 45 71
Total Out of Scope of Topic 606 Revenue 101 86 197 168
Investment management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 144 149 299 298
Development services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 71 80 143 158
Total Out of Scope of Topic 606 Revenue   3 6 4
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenue 9,754 8,391 18,663 16,326
Operating Segments | Advisory Services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,826 1,614 3,377 2,998
Total Out of Scope of Topic 606 Revenue 170 130 313 240
Total Revenue 1,996 1,744 3,690 3,238
Operating Segments | Advisory Services | Advisory leasing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 995 875 1,857 1,607
Operating Segments | Advisory Services | Advisory sales        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 460 384 819 709
Operating Segments | Advisory Services | Property management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue     0 0
Operating Segments | Advisory Services | Valuation        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 196 184 379 351
Operating Segments | Advisory Services | Other portfolio services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 96 92 178 185
Operating Segments | Advisory Services | Commercial mortgage origination        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 58 44 99 75
Total Out of Scope of Topic 606 Revenue 69 44 116 72
Operating Segments | Advisory Services | Loan servicing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 21 35 45 71
Total Out of Scope of Topic 606 Revenue 101 86 197 168
Operating Segments | Building Operations & Experience        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 5,764 4,855 11,119 9,555
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue 5,764 4,855 11,119 9,555
Operating Segments | Building Operations & Experience | Facilities management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 5,119 4,360 9,887 8,626
Operating Segments | Building Operations & Experience | Property management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 645 495 1,232 929
Operating Segments | Project Management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,786 1,563 3,417 3,082
Total Revenue 1,786 1,563 3,417 3,082
Operating Segments | Project Management | Project management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,786 1,563 3,417 3,082
Operating Segments | Real Estate Investments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 215 229 442 456
Total Out of Scope of Topic 606 Revenue 0 3 6 4
Total Revenue 215 232 448 460
Operating Segments | Real Estate Investments | Investment management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 144 149 299 298
Operating Segments | Real Estate Investments | Development services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 71 80 143 158
Total Out of Scope of Topic 606 Revenue   3 6 4
Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue (7) (3) (11) (9)
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue (7) (3) (11) (9)
Corporate, other and eliminations | Advisory leasing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 0 0 0 0
Corporate, other and eliminations | Property management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue $ (7) $ (3) $ (11) $ (9)