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Segments - Schedule of segment profit (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Total Revenue $ 35,767 $ 31,949 $ 30,828
Cost of revenue 28,811 25,675 24,239
Other adjustments to segment operating profit (loss):      
Equity (loss) income from unconsolidated subsidiaries (19) 248 229
Other income (loss) 39 61 (12)
Gain on disposition of real estate 142 27 244
Segment operating profit (loss) 1,413 1,117 1,512
Operating Segments      
Segment Reporting Information [Line Items]      
Net revenue 20,868 18,276 18,777
Pass-through costs also recognized as revenue 14,899 13,673 12,051
Total Revenue 35,767 31,949 30,828
Cost of revenue 28,811 25,675 24,239
Operating expenses and allocations 5,011 4,562 4,649
Other adjustments to segment operating profit (loss):      
Equity (loss) income from unconsolidated subsidiaries (19) 248 229
Other income (loss) 39 61 (12)
Gain on disposition of real estate 142 27 244
Other segment adjustments 480 193 348
Segment operating profit (loss) 2,587 2,241 2,749
Corporate, other and eliminations      
Segment Reporting Information [Line Items]      
Net revenue (17) (17) (16)
Pass-through costs also recognized as revenue 0 0 0
Total Revenue (17) (17) (16)
Cost of revenue 26 (3) (11)
Operating expenses and allocations 723 460 432
Other adjustments to segment operating profit (loss):      
Equity (loss) income from unconsolidated subsidiaries (134) 27 (167)
Other income (loss) 25 13 (19)
Gain on disposition of real estate 0 0 0
Other segment adjustments 305 66 45
Segment operating profit (loss) (570) (368) (578)
Advisory Services | Operating Segments      
Segment Reporting Information [Line Items]      
Net revenue 9,507 8,411 9,811
Pass-through costs also recognized as revenue 99 88 72
Total Revenue 9,606 8,499 9,883
Cost of revenue 5,858 5,147 5,980
Operating expenses and allocations 2,099 2,076 2,055
Other adjustments to segment operating profit (loss):      
Equity (loss) income from unconsolidated subsidiaries 1 4 15
Other income (loss) 5 46 1
Gain on disposition of real estate 0 0 0
Other segment adjustments 40 38 46
Segment operating profit (loss) 1,695 1,364 1,910
Global Workplace Solutions | Operating Segments      
Segment Reporting Information [Line Items]      
Net revenue 10,340 8,930 7,872
Pass-through costs also recognized as revenue 14,800 13,585 11,979
Total Revenue 25,140 22,515 19,851
Cost of revenue 22,703 20,345 17,948
Operating expenses and allocations 1,327 1,242 1,080
Other adjustments to segment operating profit (loss):      
Equity (loss) income from unconsolidated subsidiaries (3) 1 1
Other income (loss) 3 2 7
Gain on disposition of real estate 0 0 0
Other segment adjustments 91 75 68
Segment operating profit (loss) 1,201 1,006 899
Real Estate Investments | Operating Segments      
Segment Reporting Information [Line Items]      
Net revenue 1,038 952 1,110
Pass-through costs also recognized as revenue 0 0 0
Total Revenue 1,038 952 1,110
Cost of revenue 224 186 322
Operating expenses and allocations 862 784 1,082
Other adjustments to segment operating profit (loss):      
Equity (loss) income from unconsolidated subsidiaries 117 216 380
Other income (loss) 6 0 (1)
Gain on disposition of real estate 142 27 244
Other segment adjustments 44 14 189
Segment operating profit (loss) $ 261 $ 239 $ 518