cm:Concept: us-gaap:CashFlowsBetweenTransferorAndTransfereeBeneficialInterest
       
          
          | Cash Flows Between Transferor and Transferee, Beneficial Interest | 
       
       
          
          | us-gaap:CashFlowsBetweenTransferorAndTransfereeBeneficialInterest | 
       
       
          
          | Cash flows between transferee and transferor in payment of the transferor's beneficial interest related to a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction. | 
       
       
          
          | cm:Concept | 
       
       
          
          | Monetary (xbrli:monetaryItemType) | 
       
       
          
          | For Period (duration) | 
       
       
          
          | Debit | 
       
       
          
          | false | 
       
       
          
          | us-gaap:CashFlowsBetweenTransferorAndTransfereeBeneficialInterest |