cm:Concept: us-gaap:DebtDefaultShorttermDebtAmount
| Debt Default, Short-term Debt, Amount |
| us-gaap:DebtDefaultShorttermDebtAmount |
| Amount of outstanding short-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:DebtDefaultShorttermDebtAmount |