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Investments - (Narrative) (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Investments [Abstract]    
Equity Securities at Fair Value $ 11,570 $ 10,989
Fair value of largest single common stock holding $ 885 $ 842
Largest equity holdings to total equity portfolio 7.90% 7.90%
Largest equity holdings to total investment portfolio 3.20% 3.40%
Allowance for credit loss on fixed-maturity $ 39 $ 18
Number of fixed-maturity securities in a total unrealized loss position | security 2,495 2,840
Fixed-maturity securities, total unrealized loss $ 404 $ 687
Number of fixed-maturity securities in continuous unrealized loss position and below 70 percent of amortized cost 5 20
Fixed maturity investments, Percentage of amortized costs 70.00%