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Segments - Schedule of segment profit (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Total Revenue $ 8,910 $ 7,935
Cost of revenue 7,265 6,475
Adjustments to increase (decrease) net income:    
Equity income (loss) from unconsolidated subsidiaries 16 (58)
Other income 1 9
Gain on disposition of real estate 0 13
Operating income 276 204
Operating Segments    
Segment Reporting Information [Line Items]    
Net revenue 5,112 4,444
Pass-through costs also recognized as revenue 3,798 3,491
Total Revenue 8,910 7,935
Cost of revenue 7,265 6,475
Operating expenses and allocations 1,192 1,111
Adjustments to increase (decrease) net income:    
Equity income (loss) from unconsolidated subsidiaries 16 (58)
Other income 1 9
Gain on disposition of real estate   13
Other segment adjustments (1) 90 40
Operating income 560 353
Corporate, other and eliminations    
Segment Reporting Information [Line Items]    
Net revenue (4) (6)
Pass-through costs also recognized as revenue 0 0
Total Revenue (4) (6)
Cost of revenue (4) 5
Operating expenses and allocations 183 128
Adjustments to increase (decrease) net income:    
Equity income (loss) from unconsolidated subsidiaries 21 (71)
Other income (1) 5
Gain on disposition of real estate   0
Other segment adjustments (1) 67 30
Operating income (96) (175)
Advisory Services | Operating Segments    
Segment Reporting Information [Line Items]    
Net revenue 1,682 1,480
Pass-through costs also recognized as revenue 12 14
Total Revenue 1,694 1,494
Cost of revenue 967 848
Operating expenses and allocations 428 416
Adjustments to increase (decrease) net income:    
Equity income (loss) from unconsolidated subsidiaries 1 1
Other income 1 1
Gain on disposition of real estate   0
Other segment adjustments (1) 0 0
Operating income 301 232
Building Operations & Experience | Operating Segments    
Segment Reporting Information [Line Items]    
Net revenue 2,427 2,017
Pass-through costs also recognized as revenue 2,928 2,683
Total Revenue 5,355 4,700
Cost of revenue 4,847 4,269
Operating expenses and allocations 296 290
Adjustments to increase (decrease) net income:    
Equity income (loss) from unconsolidated subsidiaries 1 1
Other income 1 1
Gain on disposition of real estate   0
Other segment adjustments (1) 3 18
Operating income 217 161
Project Management | Operating Segments    
Segment Reporting Information [Line Items]    
Net revenue 774 725
Pass-through costs also recognized as revenue 858 794
Total Revenue 1,632 1,519
Cost of revenue 1,408 1,310
Operating expenses and allocations 119 88
Adjustments to increase (decrease) net income:    
Equity income (loss) from unconsolidated subsidiaries 0 0
Other income 0 2
Gain on disposition of real estate   0
Other segment adjustments (1) 8 (22)
Operating income 113 101
Real Estate Investments | Operating Segments    
Segment Reporting Information [Line Items]    
Net revenue 233 228
Pass-through costs also recognized as revenue 0 0
Total Revenue 233 228
Cost of revenue 47 43
Operating expenses and allocations 166 189
Adjustments to increase (decrease) net income:    
Equity income (loss) from unconsolidated subsidiaries (7) 11
Other income 0 0
Gain on disposition of real estate   13
Other segment adjustments (1) 12 14
Operating income $ 25 $ 34