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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

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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