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Financial instruments - Summary of Commodity Volumes Associated with Derivative Contracts (Detail) | Jun. 30, 2021 MMBTU
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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

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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: | dtr-types: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
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_SwapMember
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: |