v3.26.1
Investments - (Narrative) (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
security
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
security
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
security
Investments [Abstract]          
Equity Securities at Fair Value $ 13,194   $ 13,194   $ 12,694
Fair value of largest single common stock holding $ 1,004   $ 1,004   $ 958
Largest equity holdings to total equity portfolio 7.80%   7.80%   7.70%
Largest equity holdings to total investment portfolio 3.10%   3.10%   3.10%
Allowance for credit loss on fixed-maturity $ 55   $ 55   $ 54
Reductions in the allowance for credit losses for securities sold $ 0 $ 1 $ 1 $ 1  
Number of fixed-maturity securities in a total unrealized loss position | security 2,880   2,880   2,597
Investments, Available-for-Sale, Accumulated Gross Unrealized Loss Before Tax $ 479   $ 479   $ 397
Number of fixed-maturity securities in continuous unrealized loss position and below 70 percent of amortized cost 14   14   13
Fixed maturity investments, Percentage of amortized costs 70.00%   70.00%   70.00%