| Standard label: | Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] |
| Name: | us-gaap:UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain |
| Documentation: | General description of the goods or services to be purchased from the counterparty to the unconditional purchase arrangement. |
| 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:UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain |
| Label | Role | Language |
| Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 440 10 50 6 | http://fasb.org/us-gaap/role/ref/legacyRef | 440 |