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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
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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

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