| Standard label: | AOCI Attributable to Parent [Member] |
| Name: | us-gaap:AccumulatedOtherComprehensiveIncomeMember |
| Documentation: | Accumulated increase (decrease) in equity from transactions and other events and circumstances from non-owner sources, attributable to the parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:AccumulatedOtherComprehensiveIncomeMember |
| Label | Role | Language |
| AOCI Attributable to Parent [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 220 10 45 10A | http://fasb.org/us-gaap/role/ref/legacyRef | 220 |
| FASB Accounting Standards Codification 220 10 45 14A | http://fasb.org/us-gaap/role/ref/legacyRef | 220 |
| FASB Accounting Standards Codification 220 10 45 17B | http://www.xbrl.org/2003/role/disclosureRef | 220 |
| FASB Accounting Standards Codification 810 10 50 1A (c),(3) | http://fasb.org/us-gaap/role/ref/legacyRef | 810 |