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Investments in Unconsolidated Subsidiaries - Schedule of Equity Method Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Jan. 16, 2025
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries $ 870   $ 1,295
Industrious      
Schedule of Equity Method Investments [Line Items]      
Equity interest percentage   60.00%  
Real Estate Investments (in projects and funds)      
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries 770   702
Altus Power, Inc.      
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries 0   115
Class A common stock      
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries 0   100
Alignment shares      
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries 0   15
Other      
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries $ 100   $ 478