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Financial instruments - Summary of Commodity Volumes Associated with Derivative Contracts (Detail) | Dec. 31, 2019 MMBTU
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Derivative [Line Items] |
Commodity volumes, Gas | 4,784,739
Swap |
Derivative [Line Items] |
Commodity volumes, Gas | 2,134,739
Options |
Derivative [Line Items] |
Commodity volumes, Gas | 150,000
Forward contracts |
Derivative [Line Items] |
Commodity volumes, Gas | 2,500,000

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- Definition Volume of Energy Commodity Contracts, Natural Gas + References No definition available. + Details
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Balance Type: | na
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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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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |