| Standard label: | Foreign Exchange Option [Member] |
| Name: | us-gaap:ForeignExchangeOptionMember |
| Documentation: | An option that allows the holder to buy (if call) or sell (if put) an underlying currency at a fixed exercise rate, expressed as an exchange, during a specified period (an American option) or at a specified date (a European option). |
| 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:ForeignExchangeOptionMember |
| Label | Role | Language |
| Foreign Exchange Option [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |