| elementCreationTaxonomyVersion | 2008 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Source | Taxonomy Implementation Guide | http://fasb.org/us-gaap/role/tin/resource |
| SourceName | Retirement Benefits-Phase 2 | http://fasb.org/us-gaap/role/tin/resource |
| pdfURI | https://www.fasb.org/retirementbenefitsphase2 | http://fasb.org/us-gaap/role/tin/resource |
| Note | Element is intended to be used when denominator in percentage calculation is total plan assets, not plan assets within specific plan asset category. Element intended to be used when denominator in percentage calculation is plan assets within specific plan asset category is identified in tin-part:AlternateElement. | http://fasb.org/us-gaap/role/tin/usage |
| AlternateElement | DefinedBenefitPlanPlanAssetsInvestmentWithinPlanAssetCategoryPercentage | http://fasb.org/us-gaap/role/tin/usage |
| Publisher | FASB | http://www.xbrl.org/2009/role/commonPracticeRef |
| Name | Accounting Standards Codification | http://www.xbrl.org/2009/role/commonPracticeRef |
| Topic | 715 | http://www.xbrl.org/2009/role/commonPracticeRef |
| SubTopic | 20 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Section | 50 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Paragraph | 1 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Subparagraph | (d)(i) | http://www.xbrl.org/2009/role/commonPracticeRef |
| URI | https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 | http://www.xbrl.org/2009/role/commonPracticeRef |