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Investments in Unconsolidated Subsidiaries - Schedule of Equity Method Investments (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | $ 1,334 |  | $ 1,374
Alignment shares, relevant measurement period following merger (in years) | 7 years |  |
Real Estate Investments (in projects and funds) |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | $ 705 |  | 661
Altus Power, Inc. |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | $ 87 |  | $ 224
Alignment shares converted (in shares) |  | 201,250 |
Shares converted to Class A common stock (in shares) |  | 2,011 |
Altus Power, Inc. | Class A common stock |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Common stock shares (in shares) | 24,557,823 |  | 24,556,012
Ownership percentage | 15.40% |  |
Altus Power, Inc. | Parent Company | Class A common stock |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Shares converted to Class A common stock (in shares) |  | 1,811 |
Class A common stock |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | $ 78 |  | $ 168
Alignment shares |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | 9 |  | 56
Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | $ 542 |  | $ 489

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