Reinsurance and Indemnification - Schedule of Rollforward of Credit Loss Allowance for Reinsurance Recoverables (Details) - Property and casualty - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward] | ||||
| Beginning balance | $ (63) | $ (64) | $ (63) | $ (62) |
| Decrease (increase) in the provision for credit losses | 0 | 0 | 0 | (2) |
| Write-offs | 0 | 0 | 0 | 0 |
| Ending balance | $ (63) | $ (64) | $ (63) | $ (64) |
| X | ||||||||||
- Definition Amount of the write-down or write-off of a receivable from a reinsurer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of increase (decrease) in allowance for credit loss on reinsurance recoverable. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Definition Amount of allowance for credit loss on reinsurance recoverable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|