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Asset Retirement Obligation and Environmental Cost [Policy Text Block]

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Name	AssetRetirementObligationsAndEnvironmentalCostPolicyTextBlock
Namespace	http://fasb.org/us-gaap/2020-01-31
Prefix	us-gaap
Data type	nonnum:textBlockItemType
Period type	duration
Substitution Group	xbrli:item
Balance	None
Nillable	True
Abstract	False

Text	Lang	Role	Container role
Asset Retirement Obligation and Environmental Cost [Policy Text Block]	en-US	http://www.xbrl.org/2003/role/label	http://www.xbrl.org/2003/role/link
Disclosure of accounting policy for legal obligation associated with retirement of long-lived asset that results from acquisition, construction, or development or from normal operation of long-lived asset, and environmental remediation liability from improper or other-than-normal operation of long-lived asset. Includes, but is not limited to, timing of recognition and whether obligation is measured on discounted basis.	en-US	http://www.xbrl.org/2003/role/documentation	http://www.xbrl.org/2003/role/link

Name	Value	Role
Publisher	FASB	http://www.xbrl.org/2003/role/exampleRef
Name	Accounting Standards Codification	http://www.xbrl.org/2003/role/exampleRef
Topic	410	http://www.xbrl.org/2003/role/exampleRef
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Section	55	http://www.xbrl.org/2003/role/exampleRef
Paragraph	14	http://www.xbrl.org/2003/role/exampleRef
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Publisher	FASB	http://fasb.org/us-gaap/role/ref/legacyRef
Name	Accounting Standards Codification	http://fasb.org/us-gaap/role/ref/legacyRef
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SubTopic	10	http://fasb.org/us-gaap/role/ref/legacyRef
Section	50	http://fasb.org/us-gaap/role/ref/legacyRef
Paragraph	3	http://fasb.org/us-gaap/role/ref/legacyRef
URI	http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790	http://fasb.org/us-gaap/role/ref/legacyRef
Publisher	FASB	http://fasb.org/us-gaap/role/ref/legacyRef
Name	Accounting Standards Codification	http://fasb.org/us-gaap/role/ref/legacyRef
Topic	410	http://fasb.org/us-gaap/role/ref/legacyRef
SubTopic	20	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=6392692&loc=d3e7535-110849	http://fasb.org/us-gaap/role/ref/legacyRef
Publisher	FASB	http://www.xbrl.org/2003/role/recommendedDisclosureRef
Name	Accounting Standards Codification	http://www.xbrl.org/2003/role/recommendedDisclosureRef
Topic	410	http://www.xbrl.org/2003/role/recommendedDisclosureRef
SubTopic	30	http://www.xbrl.org/2003/role/recommendedDisclosureRef
Section	50	http://www.xbrl.org/2003/role/recommendedDisclosureRef
Paragraph	8	http://www.xbrl.org/2003/role/recommendedDisclosureRef
URI	http://asc.fasb.org/extlink&oid=6393242&loc=d3e13231-110859	http://www.xbrl.org/2003/role/recommendedDisclosureRef

	Name	Relation Type	Role
	Asset Retirement Obligation [Policy Text Block] `us-gaap:AssetRetirementObligationsPolicy`	parent-child	http://fasb.org/us-gaap/role/disclosure/AccountingPolicies
	Environmental Costs, Policy [Policy Text Block] `us-gaap:EnvironmentalCostsPolicy`	parent-child	http://fasb.org/us-gaap/role/disclosure/AccountingPolicies

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	Name	Relation Type	Role
	Policy Text Block [Abstract] `us-gaap:PolicyTextBlockAbstract`	parent-child	http://fasb.org/us-gaap/role/disclosure/ComprehensiveTextBlockList
	Significant Accounting Policies [Text Block] `us-gaap:SignificantAccountingPoliciesTextBlock`	parent-child	http://fasb.org/us-gaap/role/disclosure/AccountingPolicies