cm:Concept: us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
| Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders |
| us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders |
| Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Debit |
| false |
| us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders |