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Financial instruments - Summary of Commodity Volumes Associated with Derivative Contracts (Detail)	Dec. 31, 2018 MMBTU
Swap
Derivative [Line Items]
Commodity volumes, Gas	2,366,386
Options
Derivative [Line Items]
Commodity volumes, Gas	300,000
Forward contracts
Derivative [Line Items]
Commodity volumes, Gas	6,560,000

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- Definition

Volume of Energy Commodity Contracts, Natural Gas

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No definition available.

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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.

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No definition available.

+ Details

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- Details

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- Details

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- Details

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