cm:Concept: us-gaap:PaymentsToAcquireAssetsInvestingActivities
| Payments to Acquire Assets, Investing Activities |
| us-gaap:PaymentsToAcquireAssetsInvestingActivities |
| Aggregate cash payments for a combination of transactions that are classified as investing activities in which assets, which may include securities, other types of investments, or productive assets, are purchased from third-party sellers. This element can be used by entities to aggregate payments for all asset purchases that are classified as investing activities. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:PaymentsToAcquireAssetsInvestingActivities |