cm:Member: us-gaap:PerformanceGuaranteeMember
| Performance Guarantee [Member] |
| us-gaap:PerformanceGuaranteeMember |
| An agreement (contract) that requires the guarantor to make payments to a guaranteed party based on another entity's failure to perform under an obligating agreement. This may include the issuance of a performance standby letter of credit which requires the guarantor to make payments if a specified party fails to perform under a nonfinancial contractual obligation. |
| cm:Member |
| [Member] (nonnum:domainItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:PerformanceGuaranteeMember |