Reinsurance and Indemnification - Schedule of Effects of Reinsurance Ceded and Indemnification Programs on Property and Casualty Insurance Claims and Claims Expense and Accident, Health and Other Policy Benefits (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Property and casualty insurance claims and claims expense | ||||
| Reductions to costs and expenses due to reinsurance ceded amounts | ||||
| Ceded losses incurred | $ (141) | $ (284) | $ (1,826) | $ (516) |
| Accident, health and other policy benefits | ||||
| Reductions to costs and expenses due to reinsurance ceded amounts | ||||
| Ceded losses incurred | $ (9) | $ (8) | $ (28) | $ (14) |