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Revenue from Contracts with Customers (Tables)
 3 Months Ended
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue from Contracts with Customers
The following tables represent a disaggregation of revenue from contracts with customers by type of service and/or segment (dollars in millions):
Three Months Ended March 31, 2024
Advisory
Services		Global
Workplace
Solutions		Real Estate
Investments		Corporate, other and eliminationsConsolidated
Topic 606 Revenue:
Facilities management$— $4,066 $— $— $4,066 
Project management— 1,743 — — 1,743 
Advisory leasing739 — — — 739 
Advisory sales326 — — — 326 
Property management496 — — (6)490 
Valuation167 — — — 167 
Commercial mortgage origination (1)
30 — — — 30 
Loan servicing (2)
20 — — — 20 
Investment management— — 149 — 149 
Development services— — 77 — 77 
Topic 606 Revenue1,778 5,809 226 (6)7,807 
Out of Scope of Topic 606 Revenue:
Commercial mortgage origination65 — — — 65 
Loan servicing61 — — — 61 
Development services (3)
— — 2 — 2 
Total Out of Scope of Topic 606 Revenue126 — 2 — 128 
Total Revenue$1,904 $5,809 $228 $(6)$7,935 
Three Months Ended March 31, 2023
Advisory
Services		Global
Workplace
Solutions		Real Estate
Investments		Corporate, other and eliminationsConsolidated
Topic 606 Revenue:
Facilities management$— $3,680 $— $— $3,680 
Project management— 1,658 — — 1,658 
Advisory leasing709 — — — 709 
Advisory sales367 — — — 367 
Property management464 — — (4)460 
Valuation166 — — — 166 
Commercial mortgage origination (1)
24 — — — 24 
Loan servicing (2)
17 — — — 17 
Investment management— — 147 — 147 
Development services— — 74 — 74 
Topic 606 Revenue1,747 5,338 221 (4)7,302 
Out of Scope of Topic 606 Revenue:
Commercial mortgage origination47 — — — 47 
Loan servicing60 — — — 60 
Development services (3)
— — 2 — 2 
Total Out of Scope of Topic 606 Revenue107 — 2 — 109 
Total Revenue$1,854 $5,338 $223 $(4)$7,411 
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(1)We earn fees for arranging financing for borrowers with third-party lender contacts. Such fees are in scope of Topic 606.
(2)Loan servicing fees earned from servicing contracts for which we do not hold mortgage servicing rights are in scope of Topic 606.
(3)Out of scope revenue for development services represents selling profit from transfers of sales-type leases in the scope of Topic 842.