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Segments - Schedule of Segment Profit (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Revenue $ 10,258 $ 9,036 $ 28,921 $ 25,363
Other adjustments to segment operating profit (loss):        
Equity income (loss) from unconsolidated subsidiaries 53 (4) 50 (77)
Other income (loss) 3 12 10 26
Gain (Loss) on disposition of real estate 36 (1) 55 12
Operating income 481 368 1,131 819
Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 10,258 9,036 28,921 25,363
Pass-through costs 4,211 3,718 12,095 10,629
Cost of revenue, excluding pass-through costs 4,093 3,534 11,416 9,892
Operating expenses and allocations 1,328 1,237 3,794 3,538
Other adjustments to segment operating profit (loss):        
Equity income (loss) from unconsolidated subsidiaries 53 (4) 50 (77)
Other income (loss) 3 12 10 26
Gain (Loss) on disposition of real estate 36 (1) 55 12
Other segment adjustments 103 126 310 262
Operating income 821 680 2,041 1,527
Corporate, other and eliminations        
Segment Reporting Information [Line Items]        
Revenue (9) (7) (20) (16)
Pass-through costs 0 0 0 0
Cost of revenue, excluding pass-through costs (2) (2) 0 3
Operating expenses and allocations 183 162 542 443
Other adjustments to segment operating profit (loss):        
Equity income (loss) from unconsolidated subsidiaries 1 (10) 24 (102)
Other income (loss) 1 3 (1) 15
Gain (Loss) on disposition of real estate 3 0 3 0
Other segment adjustments 51 55 180 137
Operating income (134) (119) (356) (412)
Advisory Services | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 2,235 1,913 5,925 5,151
Pass-through costs 13 17 39 43
Cost of revenue, excluding pass-through costs 1,298 1,105 3,403 2,941
Operating expenses and allocations 481 447 1,364 1,304
Other adjustments to segment operating profit (loss):        
Equity income (loss) from unconsolidated subsidiaries 0 (9) 0 (8)
Other income (loss) 1 2 4 2
Gain (Loss) on disposition of real estate 0 0 0 0
Other segment adjustments 0 22 2 22
Operating income 444 359 1,125 879
Building Operations & Experience | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 5,794 5,145 16,913 14,700
Pass-through costs 3,085 2,804 9,147 8,114
Cost of revenue, excluding pass-through costs 2,119 1,830 6,095 5,165
Operating expenses and allocations 348 282 983 885
Other adjustments to segment operating profit (loss):        
Equity income (loss) from unconsolidated subsidiaries 3 0 (14) 4
Other income (loss) 1 (1) 6 1
Gain (Loss) on disposition of real estate 0 0 0 0
Other segment adjustments 39 16 82 76
Operating income 285 244 762 617
Project Management | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 2,027 1,683 5,444 4,766
Pass-through costs 1,113 897 2,909 2,472
Cost of revenue, excluding pass-through costs 639 541 1,797 1,622
Operating expenses and allocations 124 117 365 320
Other adjustments to segment operating profit (loss):        
Equity income (loss) from unconsolidated subsidiaries 0 1 0 0
Other income (loss) 0 0 1 2
Gain (Loss) on disposition of real estate 0 0 0 0
Other segment adjustments 2 0 13 (22)
Operating income 153 129 387 332
Real Estate Investments | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue 211 302 659 762
Pass-through costs 0 0 0 0
Cost of revenue, excluding pass-through costs 39 60 121 161
Operating expenses and allocations 192 229 540 586
Other adjustments to segment operating profit (loss):        
Equity income (loss) from unconsolidated subsidiaries 49 14 40 29
Other income (loss) 0 8 0 6
Gain (Loss) on disposition of real estate 33 (1) 52 12
Other segment adjustments 11 33 33 49
Operating income $ 73 $ 67 $ 123 $ 111