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Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Parenthetical) (Detail) - Natural Gas - Call Swaptions | Sep. 30, 2021 MmbtuPerDay $ / MMBTU
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2022 Commodity Contract |
Derivative [Line Items] |
Volume Hedged | 80,000
Weighted average price of hedge | $ / MMBTU | 2.80
2023 Commodity Contract |
Derivative [Line Items] |
Volume Hedged | 70,000

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