| Standard label: | Own-share Lending Arrangement, Counterparty Default, Period of Default, Expense |
| Name: | us-gaap:OwnshareLendingArrangementCounterpartyDefaultPeriodOfDefaultExpense |
| Documentation: | The amount of default related expense recognized in earnings in the period in which the entity concludes it is probable that the counterparty (share borrower) to a share-lending arrangement will default. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:OwnshareLendingArrangementCounterpartyDefaultPeriodOfDefaultExpense |
| Label | Role | Language |
| Own-share Lending Arrangement, Counterparty Default, Period of Default, Expense | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 470 20 50 2C | http://fasb.org/us-gaap/role/ref/legacyRef | 470 |