| Standard label: | Guarantor Obligations, Maximum Exposure Inestimable |
| Name: | us-gaap:GuaranteeObligationsMaximumExposureInestimable |
| Documentation: | States the reasons why the guarantor is unable to develop an estimate of the maximum potential amount of future payments under its guarantee (or each group of similar guarantees). |
| 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:GuaranteeObligationsMaximumExposureInestimable |
| Label | Role | Language |
| Guarantor Obligations, Maximum Exposure Inestimable | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 460 10 50 4 (b)(3) | http://fasb.org/us-gaap/role/ref/legacyRef | 460 |