| Standard label: | Payment Guarantee [Member] |
| Name: | us-gaap:PaymentGuaranteeMember |
| Documentation: | A contract that contingently requires the guarantor to make payments (either in cash, financial instrument, other assets, shares of its stock, or provision of services) to the guaranteed party based on changes in an underlying that is related to an asset, a liability, or an equity security of the guaranteed party. |
| 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:PaymentGuaranteeMember |
| Label | Role | Language |
| Payment Guarantee [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 460 10 55 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 460 |
| FASB Accounting Standards Codification 460 10 15 4 (a) | http://fasb.org/us-gaap/role/ref/legacyRef | 460 |