cm:Concept: us-gaap:DisposalGroupDeferredGainOnDisposal
| Disposal Group, Deferred Gain on Disposal |
| us-gaap:DisposalGroupDeferredGainOnDisposal |
| The excess amount received or due over net assets in a transaction accounted for as a divestiture where a subsidiary, business or operating assets are "sold" by the entity to a newly formed, thinly capitalized, highly leveraged buyer. This gain is not yet recognized and is disclosed on the balance sheet as an offset against the carrying amount of the securities received. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:DisposalGroupDeferredGainOnDisposal |