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Investments in Unconsolidated Subsidiaries - Schedule of Equity Method Investments (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Schedule of Equity Method Investments [Line Items] |  |
Total investment in unconsolidated subsidiaries | $ 1,298 | $ 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 | $ 631 | 661
Altus Power, Inc. |  |
Schedule of Equity Method Investments [Line Items] |  |
Total investment in unconsolidated subsidiaries | $ 145 | $ 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 | 15.57% |
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 | $ 117 | $ 168
Alignment shares |  |
Schedule of Equity Method Investments [Line Items] |  |
Total investment in unconsolidated subsidiaries | 28 | 56
Other |  |
Schedule of Equity Method Investments [Line Items] |  |
Total investment in unconsolidated subsidiaries | $ 522 | $ 489

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