| Standard label: | Guarantor Obligations, Current Carrying Value |
| Name: | us-gaap:GuaranteeObligationsCurrentCarryingValue |
| Documentation: | The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:GuaranteeObligationsCurrentCarryingValue |
| Label | Role | Language |
| Guarantor Obligations, Current Carrying Value | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 460 10 50 4 (c) | http://fasb.org/us-gaap/role/ref/legacyRef | 460 |