| Standard label: | Equity Swap [Member] |
| Name: | us-gaap:EquitySwapMember |
| Documentation: | Contracts in which the counterparties exchange a series of cash payments based on (a) an equity index and (b) a fixed or floating interest rate on a notional principal amount. Equity swap contracts typically are tied to a stock index, but sometimes they relate to a particular stock or a defined basket of stocks. |
| 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:EquitySwapMember |
| Label | Role | Language |
| Equity Swap [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 942 310 05 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 942 |