cm:Concept: us-gaap:SecuritiesBorrowedTransactionsAndSecuritiesLoanedTransactionsTypesOfSecurities
| Securities Borrowed Transactions and Securities Loaned Transactions, Types of Securities |
| us-gaap:SecuritiesBorrowedTransactionsAndSecuritiesLoanedTransactionsTypesOfSecurities |
| This describes the types of securities (for example, government, equities, etc.) in which the entity conducts securities borrowed transactions and securities loaned transactions. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:SecuritiesBorrowedTransactionsAndSecuritiesLoanedTransactionsTypesOfSecurities |