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Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Parenthetical) (Detail) - 2022 Commodity Contract - Call Swaptions	Jun. 30, 2021 BarrelsPerDay MmbtuPerDay $ / bbl $ / MMBTU
Natural Gas
Derivative [Line Items]
Volume Hedged | MmbtuPerDay	180,000
Weighted average price of hedge | $ / MMBTU	2.86
Crude Oil
Derivative [Line Items]
Volume Hedged | BarrelsPerDay	1,000
Weighted average price of hedge | $ / bbl	54.00

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Nominal number of units used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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- Definition

Average fixed price related to the group of price risk swap derivatives.

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