| Note | Element may be used with different date contexts such as in reconciliation of fair value of plan assets when contributions are made to plan between month-end measurement date and fiscal year-end date. XBRL value is intended to be positive whether element is used in reconciliation to increase or decrease plan assets. | http://fasb.org/us-gaap/role/tin/usage |
| Note | Element is modeled from perspective of statement of cash flows of defined benefit plan. | http://fasb.org/us-gaap/role/tin/usage |
| Source | Taxonomy Implementation Guide | http://fasb.org/us-gaap/role/tin/resource |
| SourceName | Measurement Date Practical Expedient for Defined Benefit Plans | http://fasb.org/us-gaap/role/tin/resource |
| pdfURI | https://www.fasb.org/measurementdatedefinedben_1 | http://fasb.org/us-gaap/role/tin/resource |
| inlineURI | https://xbrl.fasb.org/ix/?doc=../impdocs/MD_TIG/inline-f2017measurementdateig.htm | http://fasb.org/us-gaap/role/tin/resource |
| Source | Taxonomy Implementation Guide | http://fasb.org/us-gaap/role/tin/resource |
| SourceName | Retirement Benefits-Phase 1 | http://fasb.org/us-gaap/role/tin/resource |
| pdfURI | https://www.fasb.org/retirementbenefitsphase1 | http://fasb.org/us-gaap/role/tin/resource |
| elementCreationTaxonomyVersion | 2008 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Publisher | FASB | http://www.xbrl.org/2003/role/disclosureRef |
| Name | Accounting Standards Codification | http://www.xbrl.org/2003/role/disclosureRef |
| Topic | 715 | http://www.xbrl.org/2003/role/disclosureRef |
| SubTopic | 20 | 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 |
| Subparagraph | (b)(8) | http://www.xbrl.org/2003/role/disclosureRef |
| URI | https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 | http://www.xbrl.org/2003/role/disclosureRef |