| Standard label: | Closed Block Description of Method of Emergence of Earnings |
| Name: | us-gaap:ClosedBlockDescriptionOfMethodOfEmergenceOfEarnings |
| Documentation: | Description of the method of emergence of earnings from the closed block. |
| Object type: | cm:Concept |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ClosedBlockDescriptionOfMethodOfEmergenceOfEarnings |
| Label | Role | Language |
| Closed Block Description of Method of Emergence of Earnings | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 805 50 2 (c)(1) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |