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Segments - Schedule of Summarized Financial Information by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Revenue	$ 8,391	$ 7,720	$ 16,326	$ 15,131
Operating income (loss)	246	306	450	344
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	612	581	1,140	1,212
Operating Segments | Advisory Services
Segment Reporting Information [Line Items]
Revenue	2,218	2,042	4,122	3,895
Operating income (loss)	344	315	606	585
Operating Segments | Global Workplace Solutions
Segment Reporting Information [Line Items]
Revenue	5,944	5,426	11,753	10,764
Operating income (loss)	258	233	490	462
Operating Segments | Real Estate Investments
Segment Reporting Information [Line Items]
Revenue	232	256	460	480
Operating income (loss)	10	33	44	165
Corporate, other and eliminations
Segment Reporting Information [Line Items]
Revenue	(3)	(4)	(9)	(8)
Operating income (loss)	$ 120	$ 84	$ 294	$ 209

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