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Investments in Unconsolidated Subsidiaries - Equity Method Investments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | $ 1,374 |  | $ 1,318
Real Estate Investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | 661 |  | 623
Altus Power |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | $ 224 |  | $ 220
Altus Power | Common Class A |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Common stock shares (in shares) | 24,556,012 |  | 24,554,201
Ownership percentage | 15.57% |  | 15.57%
Altus Power | Parent [Member] | Common Class A |  |  |
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 | $ 168 |  | $ 160
Shares converted to Class A common stock (in shares) |  | 2,011 |
Alignment shares |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | 56 |  | 60
Alignment shares converted (in shares) |  | 201,250 |
Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total investment in unconsolidated subsidiaries | $ 489 |  | $ 475

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