| Standard label: | General Business Tax Credit Carryforward [Member] |
| Name: | us-gaap:GeneralBusinessMember |
| Documentation: | Tax credit carryforwards which include, but are not limited to, investment, alcohol fuels, low income housing, alternative fuels, alternative motor vehicles, hurricane relief, disabled access, renewable resources electricity production, employer social security, orphan drug, new markets, employer provided child care facilities and services, biodiesel fuels, low sulfur diesel fuel production, distilled spirits and the advanced nuclear power facilities credit. |
| 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:GeneralBusinessMember |
| Label | Role | Language |
| General Business Tax Credit Carryforward [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 740 10 50 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 740 |