| Standard label: | Derivative, Underlying Risk, Description |
| Name: | us-gaap:DerivativeUnderlyingRisk |
| Documentation: | Description of primary underlying risk exposure associated with the derivative, for example, but not limited to, interest rate risk, credit risk, foreign exchange rate risk, or price risk. |
| 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:DerivativeUnderlyingRisk |
| Label | Role | Language |
| Derivative, Underlying Risk, Description | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 815 10 50 1B | http://fasb.org/us-gaap/role/ref/legacyRef | 815 |
| FASB Accounting Standards Codification 815 10 50 1A | http://fasb.org/us-gaap/role/ref/legacyRef | 815 |
| FASB Accounting Standards Codification 815 10 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 815 |
| FASB Accounting Standards Codification 815 10 50 5 | http://fasb.org/us-gaap/role/ref/legacyRef | 815 |