| 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 |
| Positive_XBRL_Value | Asset | http://fasb.org/us-gaap/role/tin/value |
| Negative_XBRL_Value | Liability | http://fasb.org/us-gaap/role/tin/value |
| elementCreationTaxonomyVersion | 2008 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Publisher | FASB | http://fasb.org/us-gaap/role/ref/legacyRef |
| Name | Accounting Standards Codification | http://fasb.org/us-gaap/role/ref/legacyRef |
| Topic | 715 | http://fasb.org/us-gaap/role/ref/legacyRef |
| SubTopic | 20 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Section | 50 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Paragraph | 1 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Subparagraph | (c) | http://fasb.org/us-gaap/role/ref/legacyRef |
| URI | https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Publisher | FASB | http://fasb.org/us-gaap/role/ref/legacyRef |
| Name | Accounting Standards Codification | http://fasb.org/us-gaap/role/ref/legacyRef |
| Topic | 715 | http://fasb.org/us-gaap/role/ref/legacyRef |
| SubTopic | 20 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Section | 45 | http://fasb.org/us-gaap/role/ref/legacyRef |
| Paragraph | 2 | http://fasb.org/us-gaap/role/ref/legacyRef |
| URI | https://asc.fasb.org/extlink&oid=123453770&loc=d3e1703-114919 | http://fasb.org/us-gaap/role/ref/legacyRef |