cm:Concept: us-gaap:EquityMethodInvestmentMaterialEffectsOfPossibleConversionsExercisesOrContingentIssuances
| Equity Method Investment, Material Effects of Possible Conversions, Exercises or Contingent Issuances |
| us-gaap:EquityMethodInvestmentMaterialEffectsOfPossibleConversionsExercisesOrContingentIssuances |
| This item represents management's discussion of the potentially material significant effects that a possible conversion of convertible securities, exercise of outstanding options and warrants, or other contingent issuances of an investee may have on an investor's share of reported earnings or losses in an investment in an unconsolidated subsidiary, certain corporate joint ventures, and certain noncontrolled corporations which investments are accounted for under the equity method of accounting. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:EquityMethodInvestmentMaterialEffectsOfPossibleConversionsExercisesOrContingentIssuances |