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Investments - Schedule of Interest and Investment Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Schedule of Investments [Line Items]    
Gross investment income $ 824 $ 780
Investment expense (64) (70)
Interest and investment income 760 710
Fixed maturity securities, available-for-sale    
Schedule of Investments [Line Items]    
Gross investment income 569 534
Equity securities    
Schedule of Investments [Line Items]    
Gross investment income 8 10
Preferred securities    
Schedule of Investments [Line Items]    
Gross investment income 6 8
Mortgage loans    
Schedule of Investments [Line Items]    
Gross investment income 82 66
Invested cash and short-term investments    
Schedule of Investments [Line Items]    
Gross investment income 53 47
Limited partnerships    
Schedule of Investments [Line Items]    
Limited partnerships 55 54
Tax deferred property exchange income    
Schedule of Investments [Line Items]    
Gross investment income 29 32
Other investments    
Schedule of Investments [Line Items]    
Gross investment income $ 22 $ 29