cm:Level1TextBlock: us-gaap:LoansNotesTradeAndOtherReceivablesExcludingAllowanceForCreditLossesTextBlock
| Loans, Notes, Trade and Other Receivables, Excluding Allowance for Credit Losses [Text Block] |
| us-gaap:LoansNotesTradeAndOtherReceivablesExcludingAllowanceForCreditLossesTextBlock |
| The entire disclosure for claims held for amounts due a company, excluding disclosure for allowance for credit losses. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Also excludes disclosure for financing receivables. |
| cm:Level1TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:LoansNotesTradeAndOtherReceivablesExcludingAllowanceForCreditLossesTextBlock |