Taxonomy Viewer

Name	PostretirementBenefitCostsMember
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
Postretirement Benefit Costs [Member]	en-US	http://www.xbrl.org/2003/role/label	http://www.xbrl.org/2003/role/link
Rate action of a regulator resulting in capitalization or accrual of postretirement benefit costs.	en-US	http://www.xbrl.org/2003/role/documentation	http://www.xbrl.org/2003/role/link

Name	Value	Role
Publisher	FASB	http://fasb.org/us-gaap/role/ref/legacyRef
Name	Accounting Standards Codification	http://fasb.org/us-gaap/role/ref/legacyRef
Topic	980	http://fasb.org/us-gaap/role/ref/legacyRef
SubTopic	715	http://fasb.org/us-gaap/role/ref/legacyRef
Section	50	http://fasb.org/us-gaap/role/ref/legacyRef
Paragraph	1	http://fasb.org/us-gaap/role/ref/legacyRef
URI	http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419	http://fasb.org/us-gaap/role/ref/legacyRef

Name	Relation Type	Role
Regulatory Asset [Domain] `us-gaap:RegulatoryAssetDomain`	parent-child	http://fasb.org/us-gaap/role/disclosure/RegulatedOperations
Regulatory Liability [Domain] `us-gaap:RegulatoryLiabilityDomain`	parent-child	http://fasb.org/us-gaap/role/disclosure/RegulatedOperations
Regulatory Asset [Domain] `us-gaap:RegulatoryAssetDomain`	domain-member	http://fasb.org/us-gaap/role/disclosure/RegulatedOperationsScheduleOfRegulatoryAssetsTable
Regulatory Liability [Domain] `us-gaap:RegulatoryLiabilityDomain`	domain-member	http://fasb.org/us-gaap/role/disclosure/RegulatedOperationsScheduleOfRegulatoryLiabilitiesTable