Investments - (Narrative) (Details) $ in Millions |
3 Months Ended | 6 Months Ended | |
|---|---|---|---|
|
Jun. 30, 2025
USD ($)
security
|
Jun. 30, 2025
USD ($)
security
|
Dec. 31, 2024
USD ($)
security
|
|
| Investments [Abstract] | |||
| Equity Securities at Fair Value | $ 11,649 | $ 11,649 | $ 11,185 |
| Fair value of largest single common stock holding | $ 903 | $ 903 | $ 891 |
| Largest equity holdings to total equity portfolio | 8.00% | 8.00% | 8.20% |
| Largest equity holdings to total investment portfolio | 3.10% | 3.10% | 3.20% |
| Allowance for credit loss on fixed-maturity | $ 47 | $ 47 | $ 33 |
| Reductions in the allowance for credit losses for securities sold | $ (1) | $ (1) | |
| Number of fixed-maturity securities in a total unrealized loss position | security | 3,537 | 3,537 | 3,723 |
| Fixed-maturity securities, total unrealized loss | $ 582 | $ 582 | $ 631 |
| Number of fixed-maturity securities in continuous unrealized loss position and below 70 percent of amortized cost | 48 | 48 | 19 |
| Fixed maturity investments, Percentage of amortized costs | 70.00% |