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Investments - (Narrative) (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
security
Sep. 30, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Investments [Abstract]      
Equity Securities at Fair Value $ 12,547 $ 12,547 $ 11,185
Fair value of largest single common stock holding $ 940 $ 940 $ 891
Largest equity holdings to total equity portfolio 7.70% 7.70% 8.20%
Largest equity holdings to total investment portfolio 3.10% 3.10% 3.20%
Allowance for credit loss on fixed-maturity $ 41 $ 41 $ 33
Reductions in the allowance for credit losses for securities sold $ (6) $ (7)  
Number of fixed-maturity securities in a total unrealized loss position | security 2,831 2,831 3,723
Fixed-maturity securities, total unrealized loss $ 429 $ 429 $ 631
Number of fixed-maturity securities in continuous unrealized loss position and below 70 percent of amortized cost 17 17 19
Fixed maturity investments, Percentage of amortized costs   70.00%