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Investments - Interest and Investment Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Schedule of Investments [Line Items]        
Gross investment income $ 855 $ 680 $ 1,636 $ 1,354
Investment expense (72) (62) (143) (125)
Interest and investment income 783 618 1,493 1,229
Fixed maturity securities, available-for-sale        
Schedule of Investments [Line Items]        
Gross investment income 561 464 1,096 912
Equity securities        
Schedule of Investments [Line Items]        
Gross investment income 8 7 18 15
Preferred securities        
Schedule of Investments [Line Items]        
Gross investment income 10 15 18 28
Mortgage loans        
Schedule of Investments [Line Items]        
Gross investment income 65 57 131 108
Invested cash and short-term investments        
Schedule of Investments [Line Items]        
Gross investment income 53 34 100 67
Limited partnerships        
Schedule of Investments [Line Items]        
Limited partnerships 98 45 151 103
Tax deferred property exchange income        
Schedule of Investments [Line Items]        
Gross investment income 34 40 66 83
Other investments        
Schedule of Investments [Line Items]        
Gross investment income $ 26 $ 18 $ 56 $ 38