| Standard label: | Closed Block Operations, Other Expense |
| Name: | us-gaap:ClosedBlockOperationsOtherExpense |
| Documentation: | Amount of expense classified as other allocated to the closed block. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ClosedBlockOperationsOtherExpense |
| Label | Role | Language |
| Closed Block Operations, Other Expense | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 805 50 3 (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |