cm:Concept: us-gaap:SeniorLongTermNotes
| Senior Notes, Noncurrent |
| us-gaap:SeniorLongTermNotes |
| Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:SeniorLongTermNotes |