| Note | Element is modeled from income statement perspective. | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| PublishDate | 2019-01 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Positive_XBRL_Value | Enter a positive XBRL value for remeasurement gain. | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Negative_XBRL_Value | Enter a negative XBRL value for remeasurement loss. | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Note | Element is intended to be used upon adoption of amendments from Accounting Standards Update 2018-12. | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| PublishDate | 2019-01 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Source | ASU | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| SourceName | Long-duration Insurance | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Source_ASU_Number | 2018-12 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| SourceName | Long-duration Insurance | http://fasb.org/srt/role/changeNote/changeNote |
| TaxonomyVersion | 2019 | http://fasb.org/srt/role/changeNote/changeNote |
| ChangeDate | 2018-08 | http://fasb.org/srt/role/changeNote/changeNote |
| NewElement | true | http://fasb.org/srt/role/changeNote/changeNote |
| Source_ASU_Number | 2018-12 | http://fasb.org/srt/role/changeNote/changeNote |
| Publisher | FASB | http://www.xbrl.org/2003/role/disclosureRef |
| Name | Accounting Standards Codification | http://www.xbrl.org/2003/role/disclosureRef |
| Topic | 944 | http://www.xbrl.org/2003/role/disclosureRef |
| SubTopic | 40 | http://www.xbrl.org/2003/role/disclosureRef |
| Section | 45 | http://www.xbrl.org/2003/role/disclosureRef |
| Paragraph | 4 | http://www.xbrl.org/2003/role/disclosureRef |
| URI | http://asc.fasb.org/extlink&oid=121639604&loc=SL117780257-158436 | http://www.xbrl.org/2003/role/disclosureRef |