| Standard label: | Fair Value, Option, Aggregate Differences, Long-term Debt Instruments |
| Name: | us-gaap:FairValueOptionAggregateDifferencesLongTermDebtInstruments |
| Documentation: | This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of long-term debt instruments that have contractual principal amounts and for which the fair value option has been elected. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:FairValueOptionAggregateDifferencesLongTermDebtInstruments |
| Label | Role | Language |
| Fair Value, Option, Aggregate Differences, Long-term Debt Instruments | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 825 10 50 28 (d)(2) | http://fasb.org/us-gaap/role/ref/legacyRef | 825 |