| Standard label: | Change in Accounting Estimate, Type [Domain] |
| Name: | us-gaap:ChangeInAccountingEstimateTypeDomain |
| Documentation: | Identification of the accounting estimate that was changed that had the effect of adjusting the carrying amount of an existing asset or liability, or that will alter the subsequent accounting for existing or future assets or liabilities. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ChangeInAccountingEstimateTypeDomain |
| Label | Role | Language |
| Change in Accounting Estimate, Type [Domain] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 250 10 50 4 | http://fasb.org/us-gaap/role/ref/legacyRef | 250 |
| FASB Accounting Standards Codification 250 10 45 18 | http://fasb.org/us-gaap/role/ref/legacyRef | 250 |
| FASB Accounting Standards Codification 270 10 S99 1 (SX 210.10-01.(a)(5)) | http://fasb.org/us-gaap/role/ref/legacyRef | 270 |
| FASB Accounting Standards Codification 270 10 45 14 | http://fasb.org/us-gaap/role/ref/legacyRef | 270 |