Fair Value - Financial Assets and Liabilities not Measured at Fair Value (Details) - USD ($) $ in Millions |
Mar. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Carrying Amount | ||
| Assets: | ||
| Other invested assets, primarily mortgage loans | $ 1,049 | $ 1,019 |
| Liabilities: | ||
| Short-term debt | 504 | 4 |
| Long-term debt | 8,438 | 8,936 |
| Estimated Fair Value | ||
| Assets: | ||
| Other invested assets, primarily mortgage loans | 1,035 | 987 |
| Liabilities: | ||
| Short-term debt | 504 | 5 |
| Long-term debt | 8,241 | 8,668 |
| Estimated Fair Value | Level 1 | ||
| Assets: | ||
| Other invested assets, primarily mortgage loans | ||
| Liabilities: | ||
| Short-term debt | ||
| Long-term debt | ||
| Estimated Fair Value | Level 2 | ||
| Assets: | ||
| Other invested assets, primarily mortgage loans | ||
| Liabilities: | ||
| Short-term debt | 499 | |
| Long-term debt | 7,275 | 7,702 |
| Estimated Fair Value | Level 3 | ||
| Assets: | ||
| Other invested assets, primarily mortgage loans | 1,035 | 987 |
| Liabilities: | ||
| Short-term debt | 5 | 5 |
| Long-term debt | $ 966 | $ 966 |