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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

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