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Investments - Interest and Investment Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Schedule of Investments [Line Items]        
Gross investment income $ 680 $ 511 $ 1,354 $ 1,036
Investment expense (62) (48) (125) (95)
Interest and investment income 618 463 1,229 941
Fixed maturity securities, available-for-sale        
Schedule of Investments [Line Items]        
Gross investment income 464 350 912 682
Equity securities        
Schedule of Investments [Line Items]        
Gross investment income 7 7 15 15
Preferred securities        
Schedule of Investments [Line Items]        
Gross investment income 15 20 28 35
Mortgage loans        
Schedule of Investments [Line Items]        
Gross investment income 57 49 108 88
Invested cash and short-term investments        
Schedule of Investments [Line Items]        
Gross investment income 34 13 67 18
Limited partnerships        
Schedule of Investments [Line Items]        
Gross investment income 45 58 103 171
Tax deferred property exchange income        
Schedule of Investments [Line Items]        
Gross investment income 40 10 83 14
Other investments        
Schedule of Investments [Line Items]        
Gross investment income $ 18 $ 4 $ 38 $ 13