| Standard label: | Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] |
| Name: | us-gaap:ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock |
| Documentation: | Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line 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:ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock |
| Examples of this text block disclosure: | NewAccountingPronouncementsAndChangesInAccountingPrinciplesHierarchy |
| Label | Role | Language |
| Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 250 10 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 250 |
| FASB Accounting Standards Codification 250 10 50 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 250 |
| FASB Accounting Standards Codification 270 10 S99 1 (SX 210.10-01.(b)(6)) | http://fasb.org/us-gaap/role/ref/legacyRef | 270 |
| FASB Accounting Standards Codification 270 10 45 12 | http://fasb.org/us-gaap/role/ref/legacyRef | 270 |
| FASB Accounting Standards Codification 270 10 45 13 | http://fasb.org/us-gaap/role/ref/legacyRef | 270 |