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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
Mar. 31, 2024
Mar. 31, 2023
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue $ 7,807 $ 7,302
Total Out of Scope of Topic 606 Revenue 128 109
Total Revenue 7,935 7,411
Corporate, other and eliminations    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue (6) (4)
Total Out of Scope of Topic 606 Revenue 0 0
Total Revenue (6) (4)
Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 1,778 1,747
Total Out of Scope of Topic 606 Revenue 126 107
Total Revenue 1,904 1,854
Global Workplace Solutions | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 5,809 5,338
Total Out of Scope of Topic 606 Revenue 0 0
Total Revenue 5,809 5,338
Real Estate Investments | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 226 221
Total Out of Scope of Topic 606 Revenue 2 2
Total Revenue 228 223
Facilities management    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 4,066 3,680
Facilities management | Global Workplace Solutions | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 4,066 3,680
Project management    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 1,743 1,658
Project management | Global Workplace Solutions | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 1,743 1,658
Advisory leasing    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 739 709
Advisory leasing | Corporate, other and eliminations    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 0 0
Advisory leasing | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 739 709
Advisory sales    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 326 367
Advisory sales | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 326 367
Property management    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 490 460
Property management | Corporate, other and eliminations    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue (6) (4)
Property management | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 496 464
Valuation    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 167 166
Valuation | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 167 166
Commercial mortgage origination    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 30 24
Total Out of Scope of Topic 606 Revenue 65 47
Commercial mortgage origination | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 30 24
Total Out of Scope of Topic 606 Revenue 65 47
Loan servicing    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 20 17
Total Out of Scope of Topic 606 Revenue 61 60
Loan servicing | Advisory Services | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 20 17
Total Out of Scope of Topic 606 Revenue 61 60
Investment management    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 149 147
Investment management | Real Estate Investments | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 149 147
Development services    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 77 74
Total Out of Scope of Topic 606 Revenue 2 2
Development services | Real Estate Investments | Operating Segments    
Disaggregation of Revenue [Line Items]    
Topic 606 Revenue 77 74
Total Out of Scope of Topic 606 Revenue $ 2 $ 2