cm:Concept: us-gaap:EquityMethodInvestmentDistributionReceivedApproachFixedList
| Equity Method Investment, Distribution Received, Approach [Fixed List] |
| us-gaap:EquityMethodInvestmentDistributionReceivedApproachFixedList |
| Indicates method to classify distribution received from equity method investee using cumulative earnings approach or nature of distribution approach. Acceptable values are "Cumulative earnings" and "Nature of distribution". |
| cm:Concept |
| us-types:distributionsReceivedApproach |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:EquityMethodInvestmentDistributionReceivedApproachFixedList |