cm:Concept: us-gaap:DiscussionOfCashFlowHedgeEffectivenessAssessmentAndMeasurement
       
          
          | Discussion of Cash Flow Hedge Effectiveness Assessment and Measurement | 
       
       
          
          | us-gaap:DiscussionOfCashFlowHedgeEffectivenessAssessmentAndMeasurement | 
       
       
          
          | Discussion of how the entity assesses hedge effectiveness and measures hedge ineffectiveness in cash flow hedges. | 
       
       
          
          | cm:Concept | 
       
       
          
          | Text/String (xbrli:stringItemType) | 
       
       
          
          | For Period (duration) | 
       
       
          
          | (no balance type) | 
       
       
          
          | false | 
       
       
          
          | us-gaap:DiscussionOfCashFlowHedgeEffectivenessAssessmentAndMeasurement |