cm:Concept: us-gaap:RevenueFromContractWithCustomerBasisOfPricingExtensibleList
| Revenue from Contract with Customer, Basis of Pricing [Extensible List] |
| us-gaap:RevenueFromContractWithCustomerBasisOfPricingExtensibleList |
| Indicates basis of pricing for contract representing right to consideration in exchange for product and service transferred to customer. |
| cm:Concept |
| srt-types:extensibleListItemType |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:RevenueFromContractWithCustomerBasisOfPricingExtensibleList |