| Standard label: | Trading Assets, Excluding Debt and Equity Securities [Member] |
| Name: | us-gaap:TradingAssetsExcludingDebtAndEquitySecuritiesMember |
| Documentation: | Investments which the entity trades for its own profit, which may include, but is not limited to, mortgage-backed and asset-backed securities, loans, interest rate swaps, credit derivatives, commodity contracts, foreign exchange contracts and equity swaps. Excludes debt and equity securities. |
| 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:TradingAssetsExcludingDebtAndEquitySecuritiesMember |
| Label | Role | Language |
| Trading Assets, Excluding Debt and Equity Securities [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |