| PublishDate | 2017-01 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Positive_XBRL_Value | Enter a positive XBRL for net periodic benefit cost or other comprehensive loss. | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Negative_XBRL_Value | Enter a negative XBRL for net periodic benefit credit or other comprehensive income. | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| PublishDate | 2017-01 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Source | Taxonomy Implementation Guide | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| SourceName | Retirement Benefits-Phase 1 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| pdfURI | https://www.fasb.org/retirementbenefitsphase1_2017 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Publisher | FASB | http://www.xbrl.org/2003/role/exampleRef |
| Name | Accounting Standards Codification | http://www.xbrl.org/2003/role/exampleRef |
| Topic | 715 | http://www.xbrl.org/2003/role/exampleRef |
| SubTopic | 20 | http://www.xbrl.org/2003/role/exampleRef |
| Section | 55 | http://www.xbrl.org/2003/role/exampleRef |
| Paragraph | 17 | http://www.xbrl.org/2003/role/exampleRef |
| URI | http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 | http://www.xbrl.org/2003/role/exampleRef |