IndexDefined Benefit Plan, Overfunded Plan [Member]
| Name | OverfundedPlanMember |
|---|---|
| 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 |
Labels
| Text | Lang | Role | Container role |
|---|---|---|---|
| Defined Benefit Plan, Overfunded Plan [Member] | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
Related Parent Concepts
| Name | Relation Type | Role | |
|---|---|---|---|
 | us-gaap:FundedPlanMember | domain-member | http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists |
| us-gaap:RetirementPlanFundingStatusDomain | parent-child | http://fasb.org/us-gaap/role/disclosure/RetirementBenefitsTmp09 |
| us-gaap:RetirementPlanFundingStatusDomain | domain-member | http://fasb.org/us-gaap/role/disclosure/RetirementBenefitsTmp09ScheduleOfDefinedBenefitPlansDisclosuresTable |
| us-gaap:FundedPlanMember | parent-child | http://fasb.org/us-gaap/role/disclosure/CompensationRelatedCostsRetirementBenefits |
| us-gaap:FundedPlanMember | domain-member | http://fasb.org/us-gaap/role/disclosure/CompensationRelatedCostsRetirementBenefitsDefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable |
| us-gaap:FundedPlanMember | domain-member | http://fasb.org/us-gaap/role/disclosure/CompensationRelatedCostsRetirementBenefitsScheduleOfDefinedBenefitPlansDisclosuresTable |