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Segments - Schedule of Summarized Financial Information by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Revenue $ 8,910 $ 7,935
Operating income 276 204
Depreciation and amortization 177 158
Equity income (loss) from unconsolidated subsidiaries 16 (58)
Operating Segments    
Segment Reporting Information [Line Items]    
Revenue 8,910 7,935
Operating income 560 353
Equity income (loss) from unconsolidated subsidiaries 16 (58)
Operating Segments | Advisory Services    
Segment Reporting Information [Line Items]    
Revenue 1,694 1,494
Operating income 301 232
Depreciation and amortization 67 65
Equity income (loss) from unconsolidated subsidiaries 1 1
Operating Segments | Building Operations & Experience    
Segment Reporting Information [Line Items]    
Depreciation and amortization 70 46
Equity income (loss) from unconsolidated subsidiaries 1 1
Operating Segments | Project Management    
Segment Reporting Information [Line Items]    
Revenue 1,632 1,519
Operating income 113 101
Depreciation and amortization 25 29
Equity income (loss) from unconsolidated subsidiaries 0 0
Operating Segments | Real Estate Investments    
Segment Reporting Information [Line Items]    
Revenue 233 228
Operating income 25 34
Depreciation and amortization 3 3
Equity income (loss) from unconsolidated subsidiaries (7) 11
Corporate, other and eliminations    
Segment Reporting Information [Line Items]    
Depreciation and amortization 12 15
Equity income (loss) from unconsolidated subsidiaries $ 21 $ (71)