| Standard label: | Trading Liabilities [Member] |
| Name: | us-gaap:TradingLiabilitiesMember |
| Documentation: | The carrying amount of liabilities as of the balance sheet date that pertain to principal and customer trading transactions, or which may be incurred with the objective of generating a profit from short-term fluctuations in price as part of an entity's market-making, hedging and proprietary trading. Examples include short positions in securities, derivatives and commodities, obligations under repurchase agreements, and securities borrowed arrangements. |
| 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:TradingLiabilitiesMember |
| Label | Role | Language |
| Trading Liabilities [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |