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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