| SourceName | Retirement Benefits:Taxonomy Technical Improvement | http://fasb.org/srt/role/changeNote/changeNote |
| TaxonomyVersion | 2020 | http://fasb.org/srt/role/changeNote/changeNote |
| NewElement | true | http://fasb.org/srt/role/changeNote/changeNote |
| elementCreationTaxonomyVersion | 2020 | 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 | 80 | http://www.xbrl.org/2003/role/exampleRef |
| Section | 50 | http://www.xbrl.org/2003/role/exampleRef |
| Paragraph | 11 | http://www.xbrl.org/2003/role/exampleRef |
| Subparagraph | (a) | http://www.xbrl.org/2003/role/exampleRef |
| URI | https://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 | http://www.xbrl.org/2003/role/exampleRef |
| 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 | 80 | http://www.xbrl.org/2003/role/exampleRef |
| Section | 50 | http://www.xbrl.org/2003/role/exampleRef |
| Paragraph | 6 | http://www.xbrl.org/2003/role/exampleRef |
| Subparagraph | (a) | http://www.xbrl.org/2003/role/exampleRef |
| URI | https://asc.fasb.org/extlink&oid=65877416&loc=SL14450673-114947 | http://www.xbrl.org/2003/role/exampleRef |