| Name | GuaranteedMinimumWithdrawalBenefitMember |
|---|---|
| Namespace | http://fasb.org/us-gaap/2020-01-31 |
| Prefix | us-gaap |
| Data type | nonnum:domainItemType |
| Period type | duration |
| Substitution Group | xbrli:item |
| Balance | None |
| Nillable | True |
| Abstract | True |
| Text | Lang | Role | Container role |
|---|---|---|---|
| Guaranteed Minimum Withdrawal Benefit [Member] | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Feature in an insurance contract that allows the contract holder to, at a minimum, withdraw a fixed percentage of the annuity premiums on a periodic basis regardless of market performance until the premium is recovered. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Name | Value | Role |
|---|---|---|
| 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 |
| ModifiedReferences | 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/2009/role/commonPracticeRef |
| Name | Accounting Standards Codification | http://www.xbrl.org/2009/role/commonPracticeRef |
| Topic | 944 | http://www.xbrl.org/2009/role/commonPracticeRef |
| SubTopic | 40 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Section | 50 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Paragraph | 7B | http://www.xbrl.org/2009/role/commonPracticeRef |
| URI | http://asc.fasb.org/extlink&oid=121643868&loc=SL117782768-158439 | http://www.xbrl.org/2009/role/commonPracticeRef |
| Name | Relation Type | Role | |
|---|---|---|---|
us-gaap:GuaranteedInsuranceContractTypeOfBenefitDomain | parent-child | http://fasb.org/us-gaap/role/disclosure/FinancialServicesInsurance | |
us-gaap:GuaranteedInsuranceContractTypeOfBenefitDomain | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesInsuranceLiabilitiesForGuaranteesOnLongDurationContractsTable | |
us-gaap:GuaranteedInsuranceContractTypeOfBenefitDomain | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesInsuranceLongDurationContractsAssumptionsByProductAndGuaranteeTable | |
us-gaap:GuaranteedInsuranceContractTypeOfBenefitDomain | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesInsuranceNetAmountAtRiskByProductAndGuaranteeTable |