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Financial instruments - Summary of Commodity Volumes Associated with Derivative Contracts (Detail)	Dec. 31, 2017 MMBTU
Derivative [Line Items]
Commodity volumes, Gas	15,457,678
Swap
Derivative [Line Items]
Commodity volumes, Gas	2,518,812
Options
Derivative [Line Items]
Commodity volumes, Gas	518,866
Forward contracts
Derivative [Line Items]
Commodity volumes, Gas	12,420,000

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- Definition

Volume of Energy Commodity Contracts, Natural Gas

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No definition available.

+ Details

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- 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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- Details

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- Details

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X

- Details

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