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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue $ 35,103 $ 31,404 $ 30,174
Total Out of Scope of Topic 606 Revenue 664 545 654
Total Revenue 35,767 31,949 30,828
Operating Segments      
Disaggregation of Revenue [Line Items]      
Total Revenue 35,767 31,949 30,828
Corporate, other and eliminations      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue (17) (17) (16)
Total Out of Scope of Topic 606 Revenue 0 0 0
Total Revenue (17) (17) (16)
Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 8,957 7,969 9,340
Total Out of Scope of Topic 606 Revenue 649 530 543
Total Revenue 9,606 8,499 9,883
Global Workplace Solutions | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 25,140 22,515 19,851
Total Out of Scope of Topic 606 Revenue 0 0 0
Total Revenue 25,140 22,515 19,851
Real Estate Investments | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 1,023 937 999
Total Out of Scope of Topic 606 Revenue 15 15 111
Total Revenue 1,038 952 1,110
Facilities management      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 17,227 15,205 15,201
Facilities management | Global Workplace Solutions | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 17,227 15,205 15,201
Project management      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 7,913 7,310 4,650
Project management | Global Workplace Solutions | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 7,913 7,310 4,650
Advisory leasing      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 3,932 3,506 3,875
Advisory leasing | Corporate, other and eliminations      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 0 3 3
Advisory leasing | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 3,932 3,503 3,872
Advisory sales      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 1,774 1,611 2,523
Advisory sales | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 1,774 1,611 2,523
Property management      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 2,205 1,908 1,830
Property management | Corporate, other and eliminations      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue (17) (20) (19)
Property management | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 2,222 1,928 1,849
Valuation      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 751 716 765
Valuation | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 751 716 765
Commercial mortgage origination      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 196 138 274
Total Out of Scope of Topic 606 Revenue 400 286 289
Commercial mortgage origination | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 196 138 274
Total Out of Scope of Topic 606 Revenue 400 286 289
Loan servicing      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 82 73 57
Total Out of Scope of Topic 606 Revenue 249 244 254
Loan servicing | Advisory Services | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 82 73 57
Total Out of Scope of Topic 606 Revenue 249 244 254
Investment management      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 650 592 595
Investment management | Real Estate Investments | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 650 592 595
Development services      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 373 345 404
Total Out of Scope of Topic 606 Revenue 15 15 111
Development services | Real Estate Investments | Operating Segments      
Disaggregation of Revenue [Line Items]      
Topic 606 Revenue 373 345 404
Total Out of Scope of Topic 606 Revenue $ 15 $ 15 $ 111