cm:Level3TextBlock: us-gaap:ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock
| Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] |
| us-gaap:ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock |
| Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. |
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| Text Block (HTML) (nonnum:textBlockItemType) |
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| us-gaap:ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlock |
| RevenuefromExternalCustomersAndLongLivedAssetsByGeographicalAreas |