Loss And Loss Adjustment Expense Reserves (Loss And LAE Activity) (Narrative) (Detail) - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2023 |
Mar. 31, 2022 |
Dec. 31, 2022 |
|
| Loss And Loss Adjustment Expense Reserves [Line Items] | |||
| Weighted average risk-free rate used to discount claim liability | 3.80% | ||
| Lae [Member] | |||
| Loss And Loss Adjustment Expense Reserves [Line Items] | |||
| Losses and loss adjustment | $ 2 | $ 5 | |
| Loss and loss adjustment expense reserves | $ 10 | $ 12 | |
| Changes in Loss and LAE Reserves | one-year | ||