Fair Value - Schedule of Estimated Fair Value by Level (Details) - USD ($) $ in Millions |
Jun. 30, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Assets | ||
| Other invested assets | $ 6,810 | $ 6,107 |
| Debt: | ||
| Short-term borrowings | 225 | 225 |
| Fair Value, Nonrecurring | Reported Value Measurement | ||
| Assets | ||
| Other invested assets | 6,791 | 5,996 |
| Debt: | ||
| Short-term borrowings | 225 | 225 |
| Notes | 27,461 | 24,895 |
| Fair Value, Recurring | Estimate of Fair Value Measurement | ||
| Assets | ||
| Other invested assets | 6,760 | 5,972 |
| Debt: | ||
| Short-term borrowings | 225 | 225 |
| Notes | 25,326 | 23,569 |
| Fair Value, Recurring | Level I | Estimate of Fair Value Measurement | ||
| Assets | ||
| Other invested assets | 0 | 0 |
| Debt: | ||
| Short-term borrowings | 0 | 0 |
| Notes | 0 | 0 |
| Fair Value, Recurring | Level II | Estimate of Fair Value Measurement | ||
| Assets | ||
| Other invested assets | 0 | 0 |
| Debt: | ||
| Short-term borrowings | 225 | 225 |
| Notes | 25,326 | 23,569 |
| Fair Value, Recurring | Level III | Estimate of Fair Value Measurement | ||
| Assets | ||
| Other invested assets | 6,760 | 5,972 |
| Debt: | ||
| Short-term borrowings | 0 | 0 |
| Notes | $ 0 | $ 0 |