cm:Concept: us-gaap:LossContingencyAccrualProductLiabilityDueInNextRollingTwelveMonths
| Loss Contingency Accrual, Product Liability, Next Rolling Twelve Months |
| us-gaap:LossContingencyAccrualProductLiabilityDueInNextRollingTwelveMonths |
| Undiscounted amount of the accrual for damages arising from third-party use of the entity's product or process expected to be paid in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:LossContingencyAccrualProductLiabilityDueInNextRollingTwelveMonths |