Investments - Schedule of Change in Unrealized Net Capital Gains (Losses) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) | ||||
| Change in unrealized net capital gains and losses | $ (2,958) | |||
| Amounts recognized for: | ||||
| Deferred income taxes | 637 | |||
| Change in unrealized net capital gains and losses, after-tax | $ (1,945) | $ 315 | (2,321) | $ 1,122 |
| Fixed income securities | ||||
| Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) | ||||
| Change in unrealized net capital gains and losses | (2,957) | |||
| Short-term investments | ||||
| Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) | ||||
| Change in unrealized net capital gains and losses | $ (1) | |||