cm:Concept: us-gaap:HedgingAssetsNoncurrent
| Hedging Assets, Noncurrent |
| us-gaap:HedgingAssetsNoncurrent |
| Carrying amount as of the balance sheet date of the asset arising from a financial instrument or a contract used to hedge price changes in underlying assets, and which are expected to be converted into cash or otherwise disposed of after a year or beyond the normal operating cycle, if longer. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:HedgingAssetsNoncurrent |