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Investment Information - Investments accounted for using the equity method (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]    
Investments accounted for using the equity method $ 6,232 $ 5,980
Private equity    
Schedule of Equity Method Investments [Line Items]    
Investments accounted for using the equity method 2,270 1,915
Credit related funds    
Schedule of Equity Method Investments [Line Items]    
Investments accounted for using the equity method 1,588 1,487
Lending    
Schedule of Equity Method Investments [Line Items]    
Investments accounted for using the equity method 505 616
Real estate    
Schedule of Equity Method Investments [Line Items]    
Investments accounted for using the equity method 753 869
Fixed income    
Schedule of Equity Method Investments [Line Items]    
Investments accounted for using the equity method 471 384
Infrastructure    
Schedule of Equity Method Investments [Line Items]    
Investments accounted for using the equity method 411 425
Equity securities    
Schedule of Equity Method Investments [Line Items]    
Investments accounted for using the equity method 191 217
Energy    
Schedule of Equity Method Investments [Line Items]    
Investments accounted for using the equity method $ 43 $ 67