| Standard label: | Mandatorily Redeemable Preferred Stock [Member] |
| Name: | us-gaap:MandatorilyRedeemablePreferredStockMember |
| Documentation: | Preferred shares that an entity is required to redeem for cash or other assets at a fixed or determinable date or upon the occurrence of an event. |
| 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:MandatorilyRedeemablePreferredStockMember |
| Label | Role | Language |
| Mandatorily Redeemable Preferred Stock [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 480 10 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 480 |
| FASB Accounting Standards Codification 480 10 50 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 480 |