cm:Member: us-gaap:AccumulatedNetGainLossFromCashFlowHedgesAttributableToNoncontrollingInterestMember
       
          
          | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Noncontrolling Interest [Member] | 
       
       
          
          | us-gaap:AccumulatedNetGainLossFromCashFlowHedgesAttributableToNoncontrollingInterestMember | 
       
       
          
          | Accumulated other comprehensive income (loss) resulting from gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges, attributable to the noncontrolling interest. | 
       
       
          
          | cm:Member | 
       
       
          
          | [Member] (nonnum:domainItemType) | 
       
       
          
          | For Period (duration) | 
       
       
          
          | (no balance type) | 
       
       
          
          | true | 
       
       
          
          | us-gaap:AccumulatedNetGainLossFromCashFlowHedgesAttributableToNoncontrollingInterestMember |