cm:Concept: us-gaap:VariableInterestEntityTermsOfArrangements
| Variable Interest Entity, Terms of Arrangements |
| us-gaap:VariableInterestEntityTermsOfArrangements |
| Description of the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, that could require the reporting entity to provide financial support (for example, liquidity arrangements and obligations to purchase assets) to the Variable Interest Entity (VIE), including events or circumstances that could expose the reporting entity to a loss. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:VariableInterestEntityTermsOfArrangements |