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Investments in Unconsolidated Subsidiaries - Equity Method Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries $ 1,295   $ 1,374
Real Estate Investments      
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries 702   661
Altus Power      
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries $ 115   $ 224
Altus Power | Common Class A      
Schedule of Equity Method Investments [Line Items]      
Common stock shares (in shares) 24,557,823   24,556,012
Ownership percentage 15.40%    
Altus Power | Parent | 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 $ 100   $ 168
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 15   56
Alignment shares converted (in shares)   201,250  
Other      
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries $ 478   $ 489