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Goodwill - Schedule of Changes in Goodwill by Segment (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Goodwill [Roll Forward]
Beginning goodwill	$ 5,621
Reallocation	0
Acquisitions	572
Impairment	0
Foreign exchange movement	67
Ending goodwill	6,260
Advisory Services
Goodwill [Roll Forward]
Beginning goodwill	2,596
Reallocation	(290)
Acquisitions	0
Impairment	0
Foreign exchange movement	17
Ending goodwill	2,323
Building Operations & Experience
Goodwill [Roll Forward]
Beginning goodwill	2,614
Reallocation	(2,614)
Acquisitions	0
Impairment	0
Foreign exchange movement	0
Ending goodwill	0
Building Operations & Experience
Goodwill [Roll Forward]
Beginning goodwill	0
Reallocation	1,578
Acquisitions	572
Impairment	0
Foreign exchange movement	27
Ending goodwill	2,177
Project Management
Goodwill [Roll Forward]
Beginning goodwill	0
Reallocation	1,326
Acquisitions	0
Impairment	0
Foreign exchange movement	19
Ending goodwill	1,345
Real Estate Investments
Goodwill [Roll Forward]
Beginning goodwill	411
Reallocation	0
Acquisitions	0
Impairment	0
Foreign exchange movement	4
Ending goodwill	$ 415

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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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- Definition

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.

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Amount of impairment loss from 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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- Definition

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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