| Standard label: | Equity Securities, FV-NI |
| Name: | us-gaap:EquitySecuritiesFvNi |
| Documentation: | Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:EquitySecuritiesFvNi |
| Label | Role | Language |
| Equity Securities, FV-NI | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 825 10 45 1A | http://www.xbrl.org/2003/role/disclosureRef | 825 |
| Part Of Roll Up: |
| us-gaap:ShortTermInvestments |
| us-gaap:EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue |
| us-gaap:InvestmentsFairValueDisclosure |