cm:Concept: us-gaap:IncomeLossIncludingPortionAttributableToNoncontrollingInterest
       
          
          | Income (Loss), Including Portion Attributable to Noncontrolling Interest, before Tax | 
       
       
          
          | us-gaap:IncomeLossIncludingPortionAttributableToNoncontrollingInterest | 
       
       
          
          | Amount, before tax, of income (loss) including portion attributable to noncontrolling interest. Includes, but is not limited to, income (loss) from continuing operations, discontinued operations and equity method investments. | 
       
       
          
          | cm:Concept | 
       
       
          
          | Monetary (xbrli:monetaryItemType) | 
       
       
          
          | For Period (duration) | 
       
       
          
          | Credit | 
       
       
          
          | false | 
       
       
          
          | us-gaap:IncomeLossIncludingPortionAttributableToNoncontrollingInterest |