Significant New Business (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Dec. 13, 2024 |
Mar. 31, 2025 |
|
| Asset Acquisition [Line Items] | ||
| Consideration Received | $ 355 | |
| Net Loss Reserves Assumed | 359 | |
| DCA | 4 | |
| Marine, property and general liability | LPT | ||
| Asset Acquisition [Line Items] | ||
| Consideration Received | 180 | |
| Net Loss Reserves Assumed | 182 | |
| DCA | 2 | |
| Remaining Limit upon Acquisition | 128 | |
| Casualty | Novation | ||
| Asset Acquisition [Line Items] | ||
| Consideration Received | 175 | |
| Net Loss Reserves Assumed | 177 | |
| DCA | $ 2 | |
| Diversified mix including liability, professional risk, and motor | LPT | ||
| Asset Acquisition [Line Items] | ||
| Estimated Reserves | $ 2,290 |