Investments - Investment Gains (Losses) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Fixed maturity securities: | ||||
| Investment gains (losses) | $ (9) | $ (7) | $ (32) | $ (62) |
| Nonredeemable Preferred Stock | ||||
| Fixed maturity securities: | ||||
| Investment gains (losses) | (14) | 4 | (17) | 8 |
| Fixed maturity securities | ||||
| Fixed maturity securities: | ||||
| Gross gains | 21 | 15 | 46 | 33 |
| Gross losses | (16) | (25) | (63) | (100) |
| Investment gains (losses) | 5 | (10) | (17) | (67) |
| Equity securities | ||||
| Fixed maturity securities: | ||||
| Investment gains (losses) | (14) | 4 | (15) | 10 |
| Short-term investments and other | ||||
| Fixed maturity securities: | ||||
| Investment gains (losses) | $ (1) | $ (5) | ||