cm:Concept: us-gaap:ContractWithCustomerTimingOfSatisfactionOfPerformanceObligationAndPayment
| Contract with Customer, Timing of Satisfaction of Performance Obligation and Payment |
| us-gaap:ContractWithCustomerTimingOfSatisfactionOfPerformanceObligationAndPayment |
| Description of effect, from relationship that timing of satisfaction of performance obligation has on timing of payment, on right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time and on obligation to transfer good or service to customer for which consideration from customer has been received or is due. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ContractWithCustomerTimingOfSatisfactionOfPerformanceObligationAndPayment |