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Segments - Schedule of Summarized Financial Information by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | $ 181 | $ 178 | $ 540 | $ 497
Income (Loss) from Equity Method Investments | 53 | (4) | 50 | (77)
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income (Loss) from Equity Method Investments | 53 | (4) | 50 | (77)
Operating Segments | Advisory Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 69 | 67 | 203 | 192
Income (Loss) from Equity Method Investments | 0 | (9) | 0 | (8)
Operating Segments | Building Operations & Experience |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 65 | 67 | 196 | 169
Income (Loss) from Equity Method Investments | 3 | 0 | (14) | 4
Operating Segments | Project Management |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 28 | 26 | 78 | 83
Income (Loss) from Equity Method Investments | 0 | 1 | 0 | 0
Operating Segments | Real Estate Investments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 2 | 4 | 8 | 10
Income (Loss) from Equity Method Investments | 49 | 14 | 40 | 29
Corporate, other and eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and amortization | 17 | 14 | 55 | 43
Income (Loss) from Equity Method Investments | $ 1 | $ (10) | $ 24 | $ (102)

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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