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Financial instruments - Summary of Commodity Volumes Associated with Derivative Contracts (Detail) | Dec. 31, 2020 MMBTU
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Derivative [Line Items] |
Commodity volumes, Gas | 3,810,544
Swap |
Derivative [Line Items] |
Commodity volumes, Gas | 1,830,852
Options |
Derivative [Line Items] |
Commodity volumes, Gas | 479,692
Forward contracts |
Derivative [Line Items] |
Commodity volumes, Gas | 1,500,000

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

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CallOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForwardContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |