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Investments in Unconsolidated Subsidiaries - Schedule of Equity Method Investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 982 $ 1,295
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 $ 742 702
Altus Power, Inc.    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 136 $ 115
Altus Power, Inc. | Class A common stock    
Schedule of Equity Method Investments [Line Items]    
Common stock shares (in shares) 24,567,063 24,557,823
Ownership percentage 15.30%  
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 $ 122 $ 100
Shares converted to Class A common stock (in shares) 1,991  
Alignment shares    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 14 15
Alignment shares converted (in shares) 199,238  
Other    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 104 $ 478