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Investments - Schedule of Interest and Investment Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Schedule of Investments [Line Items]        
Gross investment income $ 891 $ 749 $ 2,526 $ 2,103
Investment expense (76) (63) (218) (188)
Interest and investment income 815 686 2,308 1,915
Fixed maturity securities, available-for-sale        
Schedule of Investments [Line Items]        
Gross investment income 583 493 1,679 1,405
Equity securities        
Schedule of Investments [Line Items]        
Gross investment income 8 8 26 24
Preferred securities        
Schedule of Investments [Line Items]        
Gross investment income 7 12 25 39
Mortgage loans        
Schedule of Investments [Line Items]        
Gross investment income 69 59 200 167
Invested cash and short-term investments        
Schedule of Investments [Line Items]        
Gross investment income 72 39 172 106
Limited partnerships        
Schedule of Investments [Line Items]        
Limited partnerships 84 69 234 171
Tax deferred property exchange income        
Schedule of Investments [Line Items]        
Gross investment income 36 44 102 128
Other investments        
Schedule of Investments [Line Items]        
Gross investment income $ 32 $ 25 $ 88 $ 63