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Investments in Unconsolidated Subsidiaries - Schedule of Equity Method Investments (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries $ 1,334   $ 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 $ 705   661
Altus Power, Inc.      
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries $ 87   $ 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 15.40%    
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 $ 78   $ 168
Alignment shares      
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries 9   56
Other      
Schedule of Equity Method Investments [Line Items]      
Total investment in unconsolidated subsidiaries $ 542   $ 489