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Investments - Schedule of Interest and Investment Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Schedule of Investments [Line Items]        
Gross investment income $ 924 $ 891 $ 2,593 $ 2,526
Investment expense (67) (76) (199) (218)
Interest and investment income 857 815 2,394 2,308
Fixed maturity securities, available-for-sale        
Schedule of Investments [Line Items]        
Gross investment income 606 583 1,747 1,679
Equity securities        
Schedule of Investments [Line Items]        
Gross investment income 8 8 26 26
Preferred securities        
Schedule of Investments [Line Items]        
Gross investment income 6 7 19 25
Mortgage loans        
Schedule of Investments [Line Items]        
Gross investment income 97 69 266 200
Invested cash and short-term investments        
Schedule of Investments [Line Items]        
Gross investment income 37 72 139 172
Limited partnerships        
Schedule of Investments [Line Items]        
Limited partnerships 91 84 207 234
Tax deferred property exchange income        
Schedule of Investments [Line Items]        
Gross investment income 33 36 58 102
Other investments        
Schedule of Investments [Line Items]        
Gross investment income $ 46 $ 32 $ 131 $ 88