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Restructuring Activities - Transformation and workforce optimization (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Efficiency And Cost Reduction      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 259 $ 168 $ 126
Efficiency And Cost Reduction | Corporate      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 151 14 32
Efficiency And Cost Reduction | Advisory Services | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 40 78 51
Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 65 52 31
Efficiency And Cost Reduction | Real Estate Investments | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 3 24 12
Employee separation benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 179 82  
Employee separation benefits | Efficiency And Cost Reduction      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 179 82 81
Employee separation benefits | Efficiency And Cost Reduction | Corporate      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 71 11 19
Employee separation benefits | Efficiency And Cost Reduction | Advisory Services | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 40 26 33
Employee separation benefits | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 65 32 20
Employee separation benefits | Efficiency And Cost Reduction | Real Estate Investments | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 3 13 9
Lease exit costs | Efficiency And Cost Reduction      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   45 13
Lease exit costs | Efficiency And Cost Reduction | Corporate      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   1 0
Lease exit costs | Efficiency And Cost Reduction | Advisory Services | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   39 10
Lease exit costs | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   1 3
Lease exit costs | Efficiency And Cost Reduction | Real Estate Investments | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   4 0
Professional fees and other      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 79 32  
Professional fees and other | Efficiency And Cost Reduction      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 80 32 24
Professional fees and other | Efficiency And Cost Reduction | Corporate      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 80 2 13
Professional fees and other | Efficiency And Cost Reduction | Advisory Services | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 0 7 3
Professional fees and other | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 0 19 5
Professional fees and other | Efficiency And Cost Reduction | Real Estate Investments | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 0 4 3
Subtotal | Efficiency And Cost Reduction      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   159 118
Subtotal | Efficiency And Cost Reduction | Corporate      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   14 32
Subtotal | Efficiency And Cost Reduction | Advisory Services | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   72 46
Subtotal | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   52 28
Subtotal | Efficiency And Cost Reduction | Real Estate Investments | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   21 12
Depreciation expense | Efficiency And Cost Reduction      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   9 8
Depreciation expense | Efficiency And Cost Reduction | Corporate      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   0 0
Depreciation expense | Efficiency And Cost Reduction | Advisory Services | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   6 5
Depreciation expense | Efficiency And Cost Reduction | Global Workplace Solutions | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   0 3
Depreciation expense | Efficiency And Cost Reduction | Real Estate Investments | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   $ 3 $ 0