v3.26.1
Segments - Schedule of Summarized Financial Information by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Depreciation and amortization $ 190 $ 145 $ 372 $ 287
Equity income (loss) from unconsolidated subsidiaries 4 (18) (5) (2)
Operating segments        
Segment Reporting [Line Items]        
Equity income (loss) from unconsolidated subsidiaries 4 (18) (5) (2)
Operating segments | Advisory Services        
Segment Reporting [Line Items]        
Depreciation and amortization 33 30 66 62
Equity income (loss) from unconsolidated subsidiaries (2) (1) (3) 0
Operating segments | Building Operations & Experience        
Segment Reporting [Line Items]        
Depreciation and amortization 108 61 215 131
Equity income (loss) from unconsolidated subsidiaries (2) (17) 0 (16)
Operating segments | Project Management        
Segment Reporting [Line Items]        
Depreciation and amortization 26 26 52 51
Equity income (loss) from unconsolidated subsidiaries 0 0 0 0
Operating segments | Real Estate Investments        
Segment Reporting [Line Items]        
Depreciation and amortization 9 3 13 6
Equity income (loss) from unconsolidated subsidiaries 8 (2) 1 (9)
Corporate, other and eliminations        
Segment Reporting [Line Items]        
Depreciation and amortization 14 25 26 37
Equity income (loss) from unconsolidated subsidiaries $ 0 $ 2 $ (3) $ 23