| Standard label: | Underlying Asset Class [Domain] |
| Name: | us-gaap:UnderlyingAssetClassDomain |
| Documentation: | Major types of referenced/underlying asset classes (for example, corporate debt, sovereign debt, and structured finance). |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:UnderlyingAssetClassDomain |
| Label | Role | Language |
| Underlying Asset Class [Domain] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 815 10 50 4K (a) | http://fasb.org/us-gaap/role/ref/legacyRef | 815 |