cm:Level2TextBlock: us-gaap:ConsolidationVariableInterestEntityPolicy
| Consolidation, Variable Interest Entity, Policy [Policy Text Block] |
| us-gaap:ConsolidationVariableInterestEntityPolicy |
| Disclosure of accounting policy for consolidation to describe the significant judgments and assumptions made in determining whether a variable interest held by the entity requires the variable interest entity to be consolidated and (or) disclose information about its involvement with the variable interest entity; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; and the significant factors considered and judgments made in determining that the power to direct the activities that significantly impact the economic performance of the variable interest entity are shared (as defined). |
| cm:Level2TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ConsolidationVariableInterestEntityPolicy |
| ConsolidationVariableInterestEntityPolicyPolicyTextBlock |