cm:Concept: us-gaap:TradeAndLoansReceivablesHeldForSaleNetNotPartOfDisposalGroup
| Trade and Loans Receivables Held-for-sale, Net, Not Part of Disposal Group |
| us-gaap:TradeAndLoansReceivablesHeldForSaleNetNotPartOfDisposalGroup |
| Amount, after allowance for bad debt, of trade and loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:TradeAndLoansReceivablesHeldForSaleNetNotPartOfDisposalGroup |