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Segments - Summarized Financial Information by Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Revenue | $ 31,949.0 | $ 30,828.0 | $ 27,746.0
Depreciation and amortization | 622.0 | 613.0 | 526.0
Equity income from unconsolidated subsidiaries | 248.0 | 229.0 | 619.0
Segment Operating Profit | 1,117.0 | 1,512.0 | 1,637.0
Amortization of right-to-use assets | 36.0 | 31.0 |
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Segment Operating Profit | 2,609.0 | 3,327.0 | 3,291.0
Corporate And Reconciling Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | (17.0) | (16.0) | (20.0)
Depreciation and amortization | 56.0 | 33.0 | 29.0
Equity income from unconsolidated subsidiaries | 27.0 | (167.0) | 37.0
Segment Operating Profit | 368.0 | 578.0 | 217.0
Advisory Services | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 8,499.0 | 9,883.0 | 9,575.0
Depreciation and amortization | 289.0 | 311.0 | 311.0
Equity income from unconsolidated subsidiaries | 4.0 | 15.0 | 25.0
Segment Operating Profit | 1,364.0 | 1,910.0 | 2,063.0
Global Workplace Solutions | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 22,515.0 | 19,851.0 | 17,099.0
Depreciation and amortization | 262.0 | 253.0 | 159.0
Equity income from unconsolidated subsidiaries | 1.0 | 1.0 | 2.0
Segment Operating Profit | 1,006.0 | 899.0 | 708.0
Amortization of right-to-use assets | 46.4 | 52.7 | 52.2
Real Estate Investments | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 952.0 | 1,110.0 | 1,092.0
Depreciation and amortization | 15.0 | 16.0 | 27.0
Equity income from unconsolidated subsidiaries | 216.0 | 380.0 | 555.0
Segment Operating Profit | $ 239.0 | $ 518.0 | $ 520.0

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