| Standard label: | Guarantor Obligations, Unlimited Exposure |
| Name: | us-gaap:GuaranteeObligationsUnlimitedExposure |
| Documentation: | Discloses whether the terms of the guarantee (or each group of similar guarantees) provide for no limitation to the maximum potential future payments under the guarantee. |
| 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:GuaranteeObligationsUnlimitedExposure |
| Label | Role | Language |
| Guarantor Obligations, Unlimited Exposure | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 460 10 50 4 (b)(2) | http://fasb.org/us-gaap/role/ref/legacyRef | 460 |