| Standard label: | Estimated Litigation Liability, Current |
| Name: | us-gaap:LitigationReserveCurrent |
| Documentation: | Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position. |
| 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:LitigationReserveCurrent |
| Label | Role | Language |
| Estimated Litigation Liability, Current | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 210 10 S99 1 (SX 210.5-02.25) | http://fasb.org/us-gaap/role/ref/legacyRef | 210 |
| FASB Accounting Standards Codification 450 20 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 450 |
| FASB Accounting Standards Codification 450 20 55 11 | http://fasb.org/us-gaap/role/ref/legacyRef | 450 |
| Part Of Roll Up: |
| us-gaap:LiabilitiesCurrent |