cm:Concept: us-gaap:PreferredStockRedemptionTerms
| Preferred Stock, Redemption Terms |
| us-gaap:PreferredStockRedemptionTerms |
| The redemption terms of preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity. The redemption features of this capital stock are solely within the control of the issuer. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:PreferredStockRedemptionTerms |