cm:Concept: us-gaap:NetInvestmentInLeaseRepaymentThroughOperationOrSaleOfCollateralCollateralExtensibleList
| Net Investment in Lease, Repayment through Operation or Sale of Collateral, Collateral [Extensible List] |
| us-gaap:NetInvestmentInLeaseRepaymentThroughOperationOrSaleOfCollateralCollateralExtensibleList |
| Indicates type of collateral for net investment in sales-type and direct financing leases for which repayment is expected through operation or sale of collateral and borrower is experiencing financial difficulty. |
| cm:Concept |
| srt-types:extensibleListItemType |
| As Of (instant) |
| (no balance type) |
| false |
| us-gaap:NetInvestmentInLeaseRepaymentThroughOperationOrSaleOfCollateralCollateralExtensibleList |