| Standard label: | Schedule of Other Nonoperating Income (Expense) [Table Text Block] |
| Name: | us-gaap:ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock |
| Documentation: | Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. |
| Object type: | cm:Level3TextBlock |
| Data type: | Text Block (HTML) (nonnum:textBlockItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock |
| Examples of this text block disclosure: | OtherNonoperatingIncomeExpense |
| Label | Role | Language |
| Schedule of Other Nonoperating Income (Expense) [Table Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |