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Financial instruments - Summary of Commodity Volumes Associated with Derivative Contracts (Detail)	Jun. 30, 2021 MMBTU
Derivative [Line Items]
Commodity volumes, Gas	3,168,464
Swap
Derivative [Line Items]
Commodity volumes, Gas	2,668,464
Forward contracts
Derivative [Line Items]
Commodity volumes, Gas	500,000

X

- Definition

Volume of Energy Commodity Contracts, Natural Gas

+ References

No definition available.

+ Details

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X

- Definition

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.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: