cm:Concept: us-gaap:VariableInterestEntityExtentOfOrLackOfRecourseFlag
| Variable Interest Entity, Extent of or Lack of Recourse [Fixed List] |
| us-gaap:VariableInterestEntityExtentOfOrLackOfRecourseFlag |
| A statement by the reporting entity that the creditors (or beneficial interest holders) of the consolidated Variable Interest Entity (VIE) have no recourse to the general credit of the primary beneficiary. |
| cm:Concept |
| Yes/No (us-types:yesNoItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:VariableInterestEntityExtentOfOrLackOfRecourseFlag |