cm:Table: us-gaap:BusinessCombinationSeparatelyRecognizedTransactionsTable
| Business Combination, Separately Recognized Transactions [Table] |
| us-gaap:BusinessCombinationSeparatelyRecognizedTransactionsTable |
| Schedule detailing the disclosures related to transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination by type of transaction. |
| cm:Table |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:BusinessCombinationSeparatelyRecognizedTransactionsTable |