| Standard label: | Leveraged Leases, Income (Loss) |
| Name: | us-gaap:LeveragedLeasesIncomeStatementNetIncomeFromLeveragedLeases |
| Documentation: | The total recognized during the period for income on leases meeting the criteria for classification as leveraged leases. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:LeveragedLeasesIncomeStatementNetIncomeFromLeveragedLeases |
| Label | Role | Language |
| Leveraged Leases, Income (Loss) | http://www.xbrl.org/2003/role/label | en-US |
| Leveraged Leases, Income (Loss), Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 230 10 45 28 (b) | http://www.xbrl.org/2009/role/commonPracticeRef | 230 |
| FASB Accounting Standards Codification 840 30 45 5 | http://www.xbrl.org/2003/role/disclosureRef | 840 |
| FASB Accounting Standards Codification 842 50 45 1 | http://www.xbrl.org/2003/role/disclosureRef | 842 |
| Part Of Roll Up: |
| us-gaap:InvestmentIncomeNonoperating |
| us-gaap:AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities |