cm:Concept: us-gaap:LiabilitiesOfBusinessTransferredUnderContractualArrangementCurrent
       
          
          | Liabilities of Business Transferred under Contractual Arrangement, Current | 
       
       
          
          | us-gaap:LiabilitiesOfBusinessTransferredUnderContractualArrangementCurrent | 
       
       
          
          | The current carrying amount, due within one year or one operating cycle, if longer, of liabilities resulting from the transfer of a business segment under contractual arrangement where the transferor maintains certain risks, obligations or liabilities. | 
       
       
          
          | cm:Concept | 
       
       
          
          | Monetary (xbrli:monetaryItemType) | 
       
       
          
          | As Of (instant) | 
       
       
          
          | Credit | 
       
       
          
          | false | 
       
       
          
          | us-gaap:LiabilitiesOfBusinessTransferredUnderContractualArrangementCurrent |