cm:Concept: us-gaap:DiscussionOfObjectivesForUsingPriceRiskDerivativeInstruments
| Discussion of Objectives for Using Price Risk Derivative Instruments |
| us-gaap:DiscussionOfObjectivesForUsingPriceRiskDerivativeInstruments |
| Textual description of the reasons for holding or issuing price risk derivative instruments. Includes discussion of the objectives for holding the instruments, the context needed to understand those objectives, and the strategies for achieving those objectives. Disclosures may be more meaningful if such objectives and strategies are described in the context of an entity's overall risk management profile. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:DiscussionOfObjectivesForUsingPriceRiskDerivativeInstruments |