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Investments - Schedule of Interest and Investment Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Schedule of Investments [Line Items]        
Gross investment income $ 843 $ 855 $ 1,668 $ 1,636
Investment expense (66) (72) (131) (143)
Interest and investment income 777 783 1,537 1,493
Fixed maturity securities, available-for-sale        
Schedule of Investments [Line Items]        
Gross investment income 572 561 1,141 1,096
Equity securities        
Schedule of Investments [Line Items]        
Gross investment income 7 8 15 18
Preferred securities        
Schedule of Investments [Line Items]        
Gross investment income 7 10 13 18
Mortgage loans        
Schedule of Investments [Line Items]        
Gross investment income 87 65 169 131
Invested cash and short-term investments        
Schedule of Investments [Line Items]        
Gross investment income 48 53 101 100
Limited partnerships        
Schedule of Investments [Line Items]        
Limited partnerships 60 98 115 151
Tax deferred property exchange income        
Schedule of Investments [Line Items]        
Gross investment income 29 34 58 66
Other investments        
Schedule of Investments [Line Items]        
Gross investment income $ 33 $ 26 $ 56 $ 56