cm:Member: us-gaap:AccountingStandardsUpdate201604Member
| Accounting Standards Update 2016-04 [Member] |
| us-gaap:AccountingStandardsUpdate201604Member |
| Accounting Standards Update 2016-04 Liabilities - Extinguishments of Liabilities (Subtopic 405-20): Recognition of Breakage for Certain Prepaid Stored-Value Products (a consensus of the FASB Emerging Issues Task Force). |
| cm:Member |
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| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:AccountingStandardsUpdate201604Member |