| Name | IntermediateLifePlantsAccumulatedCosts |
|---|---|
| Namespace | http://fasb.org/us-gaap/2020-01-31 |
| Prefix | us-gaap |
| Data type | xbrli:monetaryItemType |
| Period type | instant |
| Substitution Group | xbrli:item |
| Balance | debit |
| Nillable | True |
| Abstract | False |
| Text | Lang | Role | Container role |
|---|---|---|---|
| Intermediate-life Plants, Accumulated Costs | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| The amount of accumulated costs related to intermediate-life plants. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Name | Value | Role |
|---|---|---|
| Publisher | FASB | http://www.xbrl.org/2003/role/disclosureRef |
| Name | Accounting Standards Codification | http://www.xbrl.org/2003/role/disclosureRef |
| Topic | 905 | http://www.xbrl.org/2003/role/disclosureRef |
| SubTopic | 360 | http://www.xbrl.org/2003/role/disclosureRef |
| Section | 50 | http://www.xbrl.org/2003/role/disclosureRef |
| Paragraph | 1 | http://www.xbrl.org/2003/role/disclosureRef |
| URI | http://asc.fasb.org/extlink&oid=6471048&loc=d3e5272-110052 | http://www.xbrl.org/2003/role/disclosureRef |