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Segments - Schedule of Summarized Financial Information by Segment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]    
Revenue $ 7,935 $ 7,411
Operating income 204 37
Operating Segments    
Segment Reporting Information [Line Items]    
Operating income 528 631
Operating Segments | Advisory Services    
Segment Reporting Information [Line Items]    
Revenue 1,904 1,854
Operating income 262 270
Operating Segments | Global Workplace Solutions    
Segment Reporting Information [Line Items]    
Revenue 5,809 5,338
Operating income 232 230
Operating Segments | Real Estate Investments    
Segment Reporting Information [Line Items]    
Revenue 228 223
Operating income 34 131
Corporate, other and eliminations    
Segment Reporting Information [Line Items]    
Revenue (6) (4)
Operating income $ 175 $ 124