| Standard label: | Loss Contingency Nature [Axis] |
| Name: | us-gaap:LossContingenciesByNatureOfContingencyAxis |
| Documentation: | Information by type of existing condition, situation, or set of circumstances involving uncertainty as to possible loss to an enterprise that will ultimately be resolved when one or more future events occur or fail to occur. |
| Object type: | cm:Axis |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:LossContingenciesByNatureOfContingencyAxis |
| Label | Role | Language |
| Loss Contingency Nature [Axis] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 450 20 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 450 |
| FASB Accounting Standards Codification 450 20 50 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 450 |
| FASB Accounting Standards Codification 450 20 50 4 | http://fasb.org/us-gaap/role/ref/legacyRef | 450 |
| FASB Accounting Standards Codification 450 20 50 5 | http://fasb.org/us-gaap/role/ref/legacyRef | 450 |
| FASB Accounting Standards Codification 450 20 50 6 | http://fasb.org/us-gaap/role/ref/legacyRef | 450 |
| FASB Accounting Standards Codification 450 20 50 9 | http://fasb.org/us-gaap/role/ref/legacyRef | 450 |
| FASB Accounting Standards Codification 450 20 50 10 | http://fasb.org/us-gaap/role/ref/legacyRef | 450 |
| FASB Accounting Standards Codification 460 10 50 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 460 |
| FASB Accounting Standards Codification 460 10 50 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 460 |