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Investments in Unconsolidated Subsidiaries - Schedule of Equity Method Investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 1,298 $ 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 $ 631 661
Altus Power, Inc.    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 145 $ 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 15.57%  
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 $ 117 $ 168
Alignment shares    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries 28 56
Other    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 522 $ 489