Schedule of Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Natural Gas Reserves (Parenthetical) (Details)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Measurement Input, Discount Rate [Member]
Discounted Future Net Cash Flows Relating To Proved Oil And Gas Reserves [Line Items]
Alternative investment, measurement input	0.10	0.10	0.10

Value of input used to measure alternative investment.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

Name:	us-gaap_AlternativeInvestmentMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant