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Investments - (Narrative) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2025
USD ($)
security
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
security
Investments [Abstract]      
Equity Securities at Fair Value $ 11,118   $ 11,185
Fair value of largest single common stock holding $ 786   $ 891
Largest equity holdings to total equity portfolio 7.30%   8.20%
Largest equity holdings to total investment portfolio 2.80%   3.20%
Allowance for credit loss on fixed-maturity $ 35   $ 33
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Securities Sold $ 0 $ 0  
Number of fixed-maturity securities in a total unrealized loss position | security 3,679   3,723
Fixed-maturity securities, total unrealized loss $ 582   $ 631
Number of fixed-maturity securities in continuous unrealized loss position and below 70 percent of amortized cost 34   19
Fixed maturity investments, Percentage of amortized costs 70.00%