cm:Concept: us-gaap:HowTheMaximumExposureToLossIsDeterminedQualitative
| Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Determination Methodology |
| us-gaap:HowTheMaximumExposureToLossIsDeterminedQualitative |
| Describes and explains the methodology (for example, procedures or techniques) for estimating the maximum exposure to loss of the reporting entity as a result of its involvement with the Variable Interest Entity (VIE). |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:HowTheMaximumExposureToLossIsDeterminedQualitative |