cm:Table: us-gaap:ScheduleOfDefinedBenefitPlansDisclosuresTable
| Schedule of Defined Benefit Plans Disclosures [Table] |
| us-gaap:ScheduleOfDefinedBenefitPlansDisclosuresTable |
| Disclosures about an individual defined benefit pension plan or an other postretirement defined benefit plan. It may be appropriate to group certain similar plans. Also includes schedule for fair value of plan assets by major categories of plan assets by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), Significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). |
| cm:Table |
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| us-gaap:ScheduleOfDefinedBenefitPlansDisclosuresTable |