cm:Concept: us-gaap:DerivativeAssetCounterpartyNameExtensibleList
| Derivative Asset, Counterparty Name [Extensible List] |
| us-gaap:DerivativeAssetCounterpartyNameExtensibleList |
| Indicates name of counterparty to derivative asset. Counterparty is other party participating in financial transaction. Example includes, but is not limited to, name of financial institution. |
| cm:Concept |
| srt-types:extensibleListItemType |
| As Of (instant) |
| (no balance type) |
| false |
| us-gaap:DerivativeAssetCounterpartyNameExtensibleList |