cm:Level3TextBlock: us-gaap:RecordedUnconditionalPurchaseObligationsTextBlock
| Recorded Unconditional Purchase Obligations [Table Text Block] |
| us-gaap:RecordedUnconditionalPurchaseObligationsTextBlock |
| Tabular disclosure of unconditional purchase obligations that are recognized as a liability on the balance sheet, including the nature and term of the unconditional purchase obligations; the aggregate amount of payments for each of the five years following the date of the latest balance sheet; and the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings associated with suppliers' financing arrangements. |
| cm:Level3TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:RecordedUnconditionalPurchaseObligationsTextBlock |