cm:Concept: us-gaap:VariableInterestEntityCarryingAmountAssetsAndLiabilitiesQualitativeInformation
| Variable Interest Entity, Carrying Amount, Assets and Liabilities, Qualitative Information |
| us-gaap:VariableInterestEntityCarryingAmountAssetsAndLiabilitiesQualitativeInformation |
| Provides qualitative information of the relationship between the Variable Interest Entity's (VIE) assets and liabilities that are included in the reporting entity's statement of financial position. For example, if the VIE's assets can be used only to settle obligations of the VIE, the qualitative information about the nature of the restrictions on those assets would be included in this item. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:VariableInterestEntityCarryingAmountAssetsAndLiabilitiesQualitativeInformation |