cm:Concept: us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
| Long-term Debt, Maturities, Repayments of Principal in Year Four |
| us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |
| Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes 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:LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |