cm:Concept: us-gaap:InterestsContinuedToBeHeldByTransferorFairValue
| Transferor's Interests in Transferred Financial Assets, Fair Value |
| us-gaap:InterestsContinuedToBeHeldByTransferorFairValue |
| The carrying amount (fair value) as of the balance sheet date of the transferor's interests in transferred financial assets (typically securitized receivables, generally not involved in the collection of principal) following transfer of significant portions of such financial instruments to other parties. Such interests could be ancillary cash flows and interest-only strips. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:InterestsContinuedToBeHeldByTransferorFairValue |