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Investments (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Gain (Loss) on Investments      
Assets Held by Insurance Regulators $ 107 $ 108  
Collateral at fair value 91 125  
Fair Value of Owned Common Equities Held in Trust Account 216 107  
Equity Securities at Fair Value 11,185 10,989  
Largest single common stock holding $ 891 $ 842  
Largest equity holdings to total equity portfolio 8.20% 7.90%  
Largest equity holdings to total portfolio 3.20% 3.40%  
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 33 $ 18 $ 1
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Securities Sold $ 11 $ 0 $ 0
Fixed Maturities      
Gain (Loss) on Investments      
Number Of Securities Continuous Unrealized Loss Position | security 3,723 2,840 3,272
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss 3 $ 631 $ 687 $ 908
Number of securities below 70 percent of amortized cost 19 20 49