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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue $ 31,404 $ 30,174 $ 26,950
Total Out of Scope of Topic 606 Revenue 545 654 796
Total Revenue 31,949 30,828 27,746
Corporate And Reconciling Items      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue (17) (16) (20)
Total Out of Scope of Topic 606 Revenue 0 0 0
Total Revenue (17) (16) (20)
Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 7,969 9,340 8,925
Total Out of Scope of Topic 606 Revenue 530 543 650
Total Revenue 8,499 9,883 9,575
Global Workplace Solutions | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 22,515 19,851 17,099
Total Out of Scope of Topic 606 Revenue 0 0 0
Total Revenue 22,515 19,851 17,099
Real Estate Investments | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 937 999 946
Total Out of Scope of Topic 606 Revenue 15 111 146
Total Revenue 952 1,110 1,092
Facilities management      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 15,205 15,201 14,167
Facilities management | Global Workplace Solutions | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 15,205 15,201 14,167
Project management      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 7,310 4,650 2,932
Project management | Global Workplace Solutions | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 7,310 4,650 2,932
Advisory leasing      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 3,506 3,875 3,308
Advisory leasing | Corporate And Reconciling Items      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 3 3 2
Advisory leasing | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 3,503 3,872 3,306
Advisory sales      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 1,611 2,523 2,790
Advisory sales | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 1,611 2,523 2,790
Property management      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 1,908 1,830 1,717
Property management | Corporate And Reconciling Items      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue (20) (19) (22)
Property management | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 1,928 1,849 1,739
Valuation      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 716 765 733
Valuation | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 716 765 733
Commercial mortgage origination      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 138 274 314
Total Out of Scope of Topic 606 Revenue 286 289 388
Commercial mortgage origination | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 138 274 314
Total Out of Scope of Topic 606 Revenue 286 289 388
Loan servicing      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 73 57 43
Total Out of Scope of Topic 606 Revenue 244 254 262
Loan servicing | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 73 57 43
Total Out of Scope of Topic 606 Revenue 244 254 262
Investment management      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 592 595 556
Investment management | Real Estate Investments | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 592 595 556
Development services      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 345 404 390
Total Out of Scope of Topic 606 Revenue 15 111 146
Development services | Real Estate Investments | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 345 404 390
Total Out of Scope of Topic 606 Revenue $ 15 $ 111 $ 146