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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue $ 8,245 $ 7,599 $ 16,053 $ 14,902
Total Out of Scope of Topic 606 Revenue 146 121 273 229
Total Revenue 8,391 7,720 16,326 15,131
Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue (3) (4) (9) (8)
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue (3) (4) (9) (8)
Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 2,075 1,923 3,853 3,670
Total Out of Scope of Topic 606 Revenue 143 119 269 225
Total Revenue 2,218 2,042 4,122 3,895
Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 5,944 5,426 11,753 10,764
Total Out of Scope of Topic 606 Revenue 0 0 0 0
Total Revenue 5,944 5,426 11,753 10,764
Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 229 254 456 476
Total Out of Scope of Topic 606 Revenue 3 2 4 4
Total Revenue 232 256 460 480
Facilities management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 4,127 3,687 8,193 7,367
Facilities management | Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 4,127 3,687 8,193 7,367
Project management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,817 1,739 3,560 3,397
Project management | Global Workplace Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 1,817 1,739 3,560 3,397
Advisory leasing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 884 814 1,624 1,523
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 884 814 1,624 1,523
Advisory sales        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 386 398 712 765
Advisory sales | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 386 398 712 765
Property management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 552 477 1,042 937
Property management | Corporate, other and eliminations        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue (3) (4) (9) (8)
Property management | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 555 481 1,051 945
Valuation        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 184 180 351 345
Valuation | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 184 180 351 345
Commercial mortgage origination        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 44 32 73 57
Total Out of Scope of Topic 606 Revenue 81 58 146 104
Commercial mortgage origination | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 44 32 73 57
Total Out of Scope of Topic 606 Revenue 81 58 146 104
Loan servicing        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 22 18 42 35
Total Out of Scope of Topic 606 Revenue 62 61 123 121
Loan servicing | Advisory Services | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 22 18 42 35
Total Out of Scope of Topic 606 Revenue 62 61 123 121
Investment management        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 149 151 298 299
Investment management | Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 149 151 298 299
Development services        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 80 103 158 177
Total Out of Scope of Topic 606 Revenue 3 2 4 4
Development services | Real Estate Investments | Operating Segments        
Disaggregation of Revenue [Line Items]        
Topic 606 Revenue 80 103 158 177
Total Out of Scope of Topic 606 Revenue $ 3 $ 2 $ 4 $ 4