| Positive_XBRL_Value | Gain | http://fasb.org/us-gaap/role/tin/value |
| Negative_XBRL_Value | Loss | http://fasb.org/us-gaap/role/tin/value |
| 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 |
| Note | Element is modeled from perspective of statement in which net income is reported. | http://fasb.org/us-gaap/role/tin/usage |
| elementCreationTaxonomyVersion | 2012 | 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 | (a)(4) | 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 |