| Item | Type | Period | Balance | Description | | Loss Contingency Accrual | text | | | A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. |
| Loss Contingency, Classification of Accrual | text | | | |
| Retained Earnings, Appropriated | $ | instant | credit | A segregation of retained earnings which is unavailable for dividend distribution. Includes also retained earnings appropriated for loss contingencies. |
| Loss Contingency, Insurance-related Assessment | text | | | |
| Loss Contingency Accrual At Carrying Value | | | | |
| Loss Contingency Accrual, Beginning Balance | $ | instant | credit | Amount of loss contingency liability. |
| Loss Contingency Accrual, Provision | $ | duration | debit | Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges. |
| Loss Contingency Accrual, Payments | $ | duration | credit | Amount of cash outflow reducing loss contingency liability. |
| Loss Contingency Accrual, Period Increase (Decrease), Total | $ | duration | | Amount of increase (decrease) in loss contingency liability. |
| Loss Contingency, Accrual, Current | $ | instant | credit | Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer. |
| Loss Contingency, Accrual, Noncurrent | $ | instant | credit | Amount of loss contingency liability expected to be resolved after one year or beyond the normal operating cycle, if longer. |
| Loss Contingency, Balance Sheet Caption | text | | | Identifies the line item(s) of the balance sheet that reflect the loss contingency liabilities. |
| Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability | $ | duration | credit | The liability as of the balance sheet date representing required funding mandated by statute or regulatory authority that is related directly or indirectly to underwriting activities, including pools for self-insurance and excluding premium taxes and income taxes. The funds derived from the assessments generally enable a government guarantor to pay insurance claims in the event that the underwriting insurer is insolvent or otherwise unable to meet its payment obligations. |
| Loss Contingency, Discounted Amount of Insurance-related Assessment Liability | $ | instant | credit | The present value of the liability as of the balance sheet date representing required funding mandated by statute or regulatory authority that is related directly or indirectly to underwriting activities, including pools for self-insurance and excluding premium taxes and income taxes. The funds derived from the assessments generally enable a government guarantor to pay insurance claims in the event that the underwriting insurer is insolvent or otherwise unable to meet its payment obligations. |
| Loss Contingency Accrual, Insurance-related Assessment, Discount Rate | | instant | | The rate applied as of the balance sheet date to reduce the undiscounted amount of a guarantee fund and other insurance-related assessments to present value. |
| Loss Contingency Accrual, Insurance-related Assessment, Premium Tax Offset | $ | instant | debit | The amount of insurance-related assessment liability that is expected to be recovered through a premium tax offset based on current laws applied to in-force policies. |
| Loss Contingency Accrual, Insurance-related Assessment, Policy Surcharge Asset | $ | instant | debit | The amount of insurance-related assessment liability that is expected to be recovered through policy surcharges applied to in-force policies. |
| Loss Contingency, Discounted Amount of Insurance-related Assessment Liability, Payment Period | text | | | The period of time over which the discounted amount of the assessment is expected to be paid. |
| Loss Contingency, Discounted Amount of Insurance-related Assessment Liability, Realization Period for Associated Asset Offsets | text | | | The period of time over which the assets related to premium tax offsets and policy surcharges are expected to be realized. |