| SourceName | Improving Net Periodic Benefit Cost | http://fasb.org/srt/role/changeNote/changeNote |
| TaxonomyVersion | 2018 | http://fasb.org/srt/role/changeNote/changeNote |
| ChangeDate | 2017-03 | http://fasb.org/srt/role/changeNote/changeNote |
| NewElement | true | http://fasb.org/srt/role/changeNote/changeNote |
| Source_ASU_Number | 2017-07 | http://fasb.org/srt/role/changeNote/changeNote |
| Publisher | FASB | http://fasb.org/us-gaap/role/ref/otherTransitionRef |
| Name | Accounting Standards Codification | http://fasb.org/us-gaap/role/ref/otherTransitionRef |
| Topic | 715 | http://fasb.org/us-gaap/role/ref/otherTransitionRef |
| SubTopic | 20 | http://fasb.org/us-gaap/role/ref/otherTransitionRef |
| Section | 65 | http://fasb.org/us-gaap/role/ref/otherTransitionRef |
| Paragraph | 3 | http://fasb.org/us-gaap/role/ref/otherTransitionRef |
| Subparagraph | (c) | http://fasb.org/us-gaap/role/ref/otherTransitionRef |
| URI | http://asc.fasb.org/extlink&oid=118136717&loc=SL108413206-114923 | http://fasb.org/us-gaap/role/ref/otherTransitionRef |