cm:Concept: us-gaap:SecuritiesPurchasedUnderAgreementsToResellGross
| Securities Purchased under Agreements to Resell, Gross |
| us-gaap:SecuritiesPurchasedUnderAgreementsToResellGross |
| Amount, before effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:SecuritiesPurchasedUnderAgreementsToResellGross |