cm:Concept: us-gaap:RetainedInvestmentDerecognizedAssetValuationTechniqueExtensibleList
| Retained Investment, Derecognized Asset, Valuation Technique [Extensible List] |
| us-gaap:RetainedInvestmentDerecognizedAssetValuationTechniqueExtensibleList |
| Indicates valuation technique for measuring direct or indirect retained investment in derecognized group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral right and transfer of product or service in contract with customer. |
| cm:Concept |
| srt-types:extensibleListItemType |
| As Of (instant) |
| (no balance type) |
| false |
| us-gaap:RetainedInvestmentDerecognizedAssetValuationTechniqueExtensibleList |