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Segments - Schedule of Segment Profit (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Total Revenue $ 9,754 $ 8,391 $ 18,663 $ 16,326
Cost of revenue 7,942 6,793 15,207 13,268
Other adjustments to segment operating profit (loss):        
Equity loss from unconsolidated subsidiaries (18) (15) (2) (73)
Other income 5 6 7 15
Gain on disposition of real estate 19 0 19 13
Operating income 374 246 649 450
Operating Segments        
Segment Reporting Information [Line Items]        
Adjusted net revenue 5,668 4,971 10,780 9,415
Pass-through costs also recognized as revenue 4,086 3,420 7,883 6,911
Total Revenue 9,754 8,391 18,663 16,326
Cost of revenue 7,942 6,793 15,207 13,268
Operating expenses and allocations 1,275 1,191 2,467 2,302
Other adjustments to segment operating profit (loss):        
Equity loss from unconsolidated subsidiaries (18) (15) (2) (73)
Other income 5 6 7 15
Gain on disposition of real estate 19   19 13
Other segment adjustments 117 94 207 135
Operating income 660 492 1,220 846
Corporate, other and eliminations        
Segment Reporting Information [Line Items]        
Adjusted net revenue (7) (3) (11) (9)
Pass-through costs also recognized as revenue 0 0 0 0
Total Revenue (7) (3) (11) (9)
Cost of revenue 5 0 1 5
Operating expenses and allocations 177 153 360 282
Other adjustments to segment operating profit (loss):        
Equity loss from unconsolidated subsidiaries 2 (22) 23 (93)
Other income 0 8 (1) 13
Gain on disposition of real estate 0   0 0
Other segment adjustments 60 50 128 82
Operating income (127) (120) (222) (294)
Advisory Services | Operating Segments        
Segment Reporting Information [Line Items]        
Adjusted net revenue 1,983 1,732 3,665 3,212
Pass-through costs also recognized as revenue 13 12 25 26
Total Revenue 1,996 1,744 3,690 3,238
Cost of revenue 1,164 1,016 2,131 1,863
Operating expenses and allocations 455 440 883 856
Other adjustments to segment operating profit (loss):        
Equity loss from unconsolidated subsidiaries (1) 0 0 1
Other income 2 (1) 3 0
Gain on disposition of real estate 0   0 0
Other segment adjustments 2 0 2 0
Operating income 380 287 681 520
Building Operations & Experience | Operating Segments        
Segment Reporting Information [Line Items]        
Adjusted net revenue 2,630 2,228 5,057 4,244
Pass-through costs also recognized as revenue 3,134 2,627 6,062 5,311
Total Revenue 5,764 4,855 11,119 9,555
Cost of revenue 5,192 4,375 10,039 8,644
Operating expenses and allocations 339 314 635 604
Other adjustments to segment operating profit (loss):        
Equity loss from unconsolidated subsidiaries (16) 3 (16) 4
Other income 3 1 4 2
Gain on disposition of real estate 0   0 0
Other segment adjustments 41 43 44 60
Operating income 261 213 477 373
Project Management | Operating Segments        
Segment Reporting Information [Line Items]        
Adjusted net revenue 847 782 1,621 1,508
Pass-through costs also recognized as revenue 939 781 1,796 1,574
Total Revenue 1,786 1,563 3,417 3,082
Cost of revenue 1,545 1,345 2,954 2,656
Operating expenses and allocations 122 115 241 203
Other adjustments to segment operating profit (loss):        
Equity loss from unconsolidated subsidiaries 0 0 0 0
Other income 0 (1) 1 2
Gain on disposition of real estate 0   0 0
Other segment adjustments 2 0 11 (22)
Operating income 121 102 234 203
Real Estate Investments | Operating Segments        
Segment Reporting Information [Line Items]        
Adjusted net revenue 215 232 448 460
Pass-through costs also recognized as revenue 0 0 0 0
Total Revenue 215 232 448 460
Cost of revenue 36 57 82 100
Operating expenses and allocations 182 169 348 357
Other adjustments to segment operating profit (loss):        
Equity loss from unconsolidated subsidiaries (3) 4 (9) 15
Other income 0 (1) 0 (2)
Gain on disposition of real estate 19   19 13
Other segment adjustments 12 1 22 15
Operating income $ 25 $ 10 $ 50 $ 44