cm:Member: us-gaap:AccountingStandardsUpdate201804Member
| Accounting Standards Update 2018-04 [Member] |
| us-gaap:AccountingStandardsUpdate201804Member |
| Accounting Standards Update 2018-04 Investments-Debt Securities (Topic 320) and Regulated Operations (Topic 980): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 117 and SEC Release No. 33-9273. |
| cm:Member |
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| For Period (duration) |
| (no balance type) |
| true |
| us-gaap:AccountingStandardsUpdate201804Member |