| Standard label: | Fair Value, Concentration of Risk, Guarantees |
| Name: | us-gaap:FairValueConcentrationOfRiskGuarantees |
| Documentation: | This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties. |
| 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:FairValueConcentrationOfRiskGuarantees |
| Label | Role | Language |
| Fair Value, Concentration of Risk, Guarantees | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 460 10 50 5 | http://fasb.org/us-gaap/role/ref/legacyRef | 460 |
| FASB Accounting Standards Codification 825 10 50 21 | http://fasb.org/us-gaap/role/ref/legacyRef | 825 |
| FASB Accounting Standards Codification 825 10 50 23 | http://fasb.org/us-gaap/role/ref/legacyRef | 825 |