| Standard label: | Effects on Future Earnings and Cash Flows, by Type of Effect [Domain] |
| Name: | us-gaap:EffectsOnFutureEarningsAndCashFlowsByTypeOfEffectDomain |
| Documentation: | Identification of the types of effects on future earnings and cash flows. |
| 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:EffectsOnFutureEarningsAndCashFlowsByTypeOfEffectDomain |
| Label | Role | Language |
| Effects on Future Earnings and Cash Flows, by Type of Effect [Domain] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 420 10 S99 2 (SAB Topic 5.P.4) | http://fasb.org/us-gaap/role/ref/legacyRef | 420 |