cm:Concept: us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearThree
| Long-term Debt, Maturities, Repayments of Principal in Rolling Year Three |
| us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearThree |
| 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 third rolling twelve months following the latest balance sheet. For 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:LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearThree |