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Goodwill - Schedule of Changes in Goodwill by Segment (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Goodwill [Roll Forward]
Beginning goodwill	$ 5,621
Reallocation	0
Acquisitions	590
Foreign exchange movement	189
Ending goodwill	6,400
Advisory Services
Goodwill [Roll Forward]
Beginning goodwill	2,596
Reallocation	(290)
Acquisitions	24
Foreign exchange movement	55
Ending goodwill	2,385
Accumulated impairment losses		$ (673)
Global Workplace Solutions
Goodwill [Roll Forward]
Beginning goodwill	2,614
Reallocation	(2,614)
Acquisitions	0
Foreign exchange movement	0
Ending goodwill	0
Building Operations & Experience
Goodwill [Roll Forward]
Beginning goodwill	0
Reallocation	1,578
Acquisitions	566
Foreign exchange movement	74
Ending goodwill	2,218
Accumulated impairment losses		(175)
Project Management
Goodwill [Roll Forward]
Beginning goodwill	0
Reallocation	1,326
Acquisitions	0
Foreign exchange movement	49
Ending goodwill	1,375
Accumulated impairment losses		(89)
Real Estate Investments
Goodwill [Roll Forward]
Beginning goodwill	411
Reallocation	0
Acquisitions	0
Foreign exchange movement	11
Ending goodwill	$ 422
Accumulated impairment losses		$ (183)

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Goodwill Reallocation

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) asset representing future economic benefit from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Amount, before accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Includes amount, before amortization expense and impairment loss, of goodwill for private company.

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Amount of accumulated impairment loss for asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Amount of increase (decrease) from measurement period adjustment of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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