cm:Table: us-gaap:FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable
| Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] |
| us-gaap:FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable |
| Schedule that discloses the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. |
| cm:Table |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable |