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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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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.

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