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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue $ 10,096 $ 8,857 $ 28,484 $ 24,986
Total Out of Scope of Topic 606 Revenue 162 179 437 377
Total Revenue 10,258 9,036 28,921 25,363
Facilities management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 5,137 4,638 15,024 13,263
Project management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 2,027 1,683 5,444 4,766
Advisory leasing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,145 974 3,001 2,582
Advisory sales        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 544 420 1,364 1,129
Property management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 648 500 1,869 1,421
Valuation        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 194 178 573 528
Other portfolio services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 90 96 267 282
Commercial mortgage origination        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 55 44 155 117
Total Out of Scope of Topic 606 Revenue 80 71 196 144
Loan servicing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 47 24 136 143
Total Out of Scope of Topic 606 Revenue 80 106 233 226
Investment management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 148 196 447 494
Development services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 61 104 204 261
Total Out of Scope of Topic 606 Revenue 2 2 8 7
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Revenue 10,258 9,036 28,921 25,363
Operating Segments | Advisory Services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 2,075 1,736 5,496 4,781
Total Out of Scope of Topic 606 Revenue 160 177 429 370
Total Revenue 2,235 1,913 5,925 5,151
Operating Segments | Advisory Services | Advisory leasing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,145 974 3,001 2,582
Operating Segments | Advisory Services | Advisory sales        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 544 420 1,364 1,129
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 194 178 573 528
Operating Segments | Advisory Services | Other portfolio services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 90 96 267 282
Operating Segments | Advisory Services | Commercial mortgage origination        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 55 44 155 117
Total Out of Scope of Topic 606 Revenue 80 71 196 144
Operating Segments | Advisory Services | Loan servicing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 47 24 136 143
Total Out of Scope of Topic 606 Revenue 80 106 233 226
Operating Segments | Building Operations & Experience        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 5,794 5,145 16,913 14,700
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue 5,794 5,145 16,913 14,700
Operating Segments | Building Operations & Experience | Facilities management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 5,137 4,638 15,024 13,263
Operating Segments | Building Operations & Experience | Property management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 657 507 1,889 1,437
Operating Segments | Project Management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 2,027 1,683 5,444 4,766
Total Revenue 2,027 1,683 5,444 4,766
Operating Segments | Project Management | Project management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 2,027 1,683 5,444 4,766
Operating Segments | Real Estate Investments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 209 300 651 755
Total Out of Scope of Topic 606 Revenue 2 2 8 7
Total Revenue 211 302 659 762
Operating Segments | Real Estate Investments | Investment management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 148 196 447 494
Operating Segments | Real Estate Investments | Development services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 61 104 204 261
Total Out of Scope of Topic 606 Revenue 2 2 8 7
Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue (9) (7) (20) (16)
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue (9) (7) (20) (16)
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 $ (9) $ (7) $ (20) $ (16)