Contract Adjustment Payments, Accretion Period

No definition available.

Name:	aqunf_ContractAdjustmentPaymentsAccretionPeriod
Namespace Prefix:	aqunf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Contract Adjustment Payments, Excluding Interest

+ References

No definition available.

+ Details

Name:	aqunf_ContractAdjustmentPaymentsExcludingInterest
Namespace Prefix:	aqunf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Convertible, Number of Trading Days Included in Average Price of Common Shares

+ References

No definition available.

+ Details

Name:	aqunf_DebtInstrumentConvertibleNumberOfTradingDaysIncludedInAveragePriceOfCommonShares
Namespace Prefix:	aqunf_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Interest Expense on Long-Term Liabilities, Net of Proceeds

+ References

No definition available.

+ Details

Name:	aqunf_InterestExpenseOnLongTermLiabilitiesNetOfProceeds
Namespace Prefix:	aqunf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of Debt Instruments Repaid

+ References

No definition available.

+ Details

Name:	aqunf_NumberOfDebtInstrumentsRepaid
Namespace Prefix:	aqunf_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of New Credit Facilities

+ References

No definition available.

+ Details

Name:	aqunf_NumberofNewCreditFacilities
Namespace Prefix:	aqunf_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Temporary Equity, Beneficial Ownership Interest, Percent

+ References

No definition available.

+ Details

Name:	aqunf_TemporaryEquityBeneficialOwnershipInterestPercent
Namespace Prefix:	aqunf_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Temporary Equity, Dividend Rate, Percentage

+ References

No definition available.

+ Details

Name:	aqunf_TemporaryEquityDividendRatePercentage
Namespace Prefix:	aqunf_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Temporary Equity, Maximum Settlement Rate

+ References

No definition available.

+ Details

Name:	aqunf_TemporaryEquityMaximumSettlementRate
Namespace Prefix:	aqunf_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Temporary Equity, Price Per Share Included in Maximum Settlement Rate Calculation

+ References

No definition available.

+ Details

Name:	aqunf_TemporaryEquityPricePerShareIncludedInMaximumSettlementRateCalculation
Namespace Prefix:	aqunf_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Temporary Equity, Share Purchase Contract, Interest Rate

+ References

No definition available.

+ Details

Name:	aqunf_TemporaryEquitySharePurchaseContractInterestRate
Namespace Prefix:	aqunf_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Temporary Equity, Threshold Appreciation Price Per Share

+ References

No definition available.

+ Details

Name:	aqunf_TemporaryEquityThresholdAppreciationPricePerShare
Namespace Prefix:	aqunf_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Total remaining unamortized or unaccreted amounts of premiums, discounts, and intangible assets, in years subsequent to the year of acquisition, when the total amounts of remaining discounts, premiums, and intangible assets exceed 30 percent of stockholders' equity.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionsPurchasePriceAllocationSubsequentYearsRemainingAdjustments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of long-term debt due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21521-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(5))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

+ Details

Name:	us-gaap_DebtInstrumentConvertibleConversionRatio1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

Name:	us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest payable on debt, including, but not limited to, trade payables.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15(a))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

Name:	us-gaap_InterestPayableCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromConvertibleDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfUnsecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(1))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

Name:	us-gaap_ShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=122040564&loc=d3e177068-122764

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (27)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_TemporaryEquityParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(27)(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_TemporaryEquitySharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=aqunf_NewYorkWaterCompanyIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=aqunf_KentuckyPowerCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_SeniorUnsecuredBankCreditFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_SeniorUnsecuredDebenturesDueFebruary2050Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_JuniorSubordinatedNotesSeries2022BDueJanuary182082Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_JuniorSubordinatedNotesSeries2022ADueJanuary182082Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_CanadianDollarSeniorUnsecuredNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_SeniorUnsecuredSyndicatedRevolvingCreditFacilityMaturingOnJuly122024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_SeniorUnsecuredSyndicatedRevolvingCreditFacilityMaturingOnFebruary232023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_SeniorUnsecuredSyndicatedRevolvingCreditFacilityMaturingOnOctober62023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_SeniorUnsecuredRevolvingCreditFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=aqunf_AscendantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=aqunf_ESSALMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_U.SDollarSeniorUnsecuredNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_ChileanSeniorUnsecuredUtilityNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_ChileanSeniorUnsecuredUtilityNotesSeriesBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_ChileanSeniorUnsecuredUtilityNotesSeriesCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_U.S.DollarSubordinatedUnsecuredNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_USDollarSeniorUnsecuredNotesGreenEquityUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_SeniorUnsecuredUtilityNoteOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=aqunf_SeniorUnsecuredUtilityNoteTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-term debt - Narrative (Detail)							1 Months Ended			12 Months Ended
Long-term debt - Narrative (Detail)	Jan. 18, 2022 USD ($)	Oct. 13, 2020 USD ($) unsecuredBond creditFacility	Jul. 31, 2020 USD ($)	Jun. 01, 2020 USD ($)	Apr. 30, 2020 USD ($)	Feb. 15, 2020 USD ($)	Dec. 31, 2021 CLP ($)	Jun. 30, 2021 USD ($) tradingDay $ / shares shares	Dec. 31, 2020 CLP ($)	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) utilityNote	Dec. 31, 2020 CAD ($) utilityNote	Feb. 15, 2022 CAD ($)	Dec. 31, 2021 CAD ($)	Dec. 31, 2021 CLP ($)	Dec. 20, 2021 USD ($)	Oct. 26, 2021 USD ($)	Apr. 09, 2021 CAD ($)	Apr. 09, 2021 $ / shares	Feb. 15, 2021 CAD ($)	Nov. 08, 2020 USD ($) termLoanFacility	Oct. 13, 2020 CLP ($) creditFacility	Oct. 05, 2020 creditFacility	Sep. 23, 2020 USD ($)	Jun. 30, 2020 USD ($) creditFacility	Feb. 24, 2020 USD ($)	Feb. 14, 2020 CAD ($)	May 23, 2019 USD ($)
Debt Instrument [Line Items]
Short-term debt										$ 478,248,000
Line of credit facility, remaining borrowing capacity										$ 1,086,000
Green Equity Units issued (in shares) \| shares								23,000,000
Green Equity Units, stated value (in USD per share) \| $ / shares										$ 50
Green Equity Units, beneficial ownership interest in remarketable senior note (percent)										5.00%				5.00%	5.00%
Green Equity Units, annual distributions (percent)								7.75%
Green Equity Units, share purchase contract, interest rate (percent)								6.57%
Contract Adjustment Payments, Excluding Interest								$ 222,378,000		$ 222,378,000
Contract adjustment payments, accretion period								3 years
Number of trading days included in average price of common shares \| tradingDay								20
Debt instrument, convertible debt, conversion ration to common shares								2.7778
Green Equity Unit, threshold appreciation price per share (in USD per share) \| $ / shares								$ 18
Green Equity Units, maximum settlement rate under the purchase contracts								3.3333
Green Equity Units, price per share included in maximum settlement rate calculation (in USD per share) \| $ / shares								$ 15
Share price (in dollars per share) \| $ / shares																			$ 999.92
Interest on long-term debt										49,806,000	$ 50,486,000
Interest expense during the year on long-term liabilities										159,545,000	$ 175,358,000
Subsequent Event
Debt Instrument [Line Items]
Par value	$ 320,000
Debt instrument, effective interest rate	4.95%
Debt instrument, term	10 years
New York Water Company, Inc
Debt Instrument [Line Items]
Business acquisitions, purchase price allocation, subsequent years, remaining adjustments										$ 610,400,000
Kentucky Power Company
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity																	$ 2,725,000,000
Senior unsecured bank credit facilities \| Line of Credit
Debt Instrument [Line Items]
Debt repaid upon maturity												$ 135,000,000
Senior Unsecured Debentures Due February 2050
Debt Instrument [Line Items]
Par value																		$ 1,000
Junior Subordinated Notes Series 2022-B Due January 18, 2082 \| Subsequent Event
Debt Instrument [Line Items]
Par value	$ 750,000
Interest rate (percent)	4.75%
Junior Subordinated Notes Series 2022-A Due January 18, 2082 \| Subsequent Event
Debt Instrument [Line Items]
Par value	$ 400,000
Interest rate (percent)	5.25%
Senior Unsecured Debt
Debt Instrument [Line Items]
Debt repaid upon maturity			$ 25,000,000	$ 100,000,000	$ 100,000,000	$ 6,500,000
Senior Unsecured Debt \| Canadian dollar Senior unsecured notes
Debt Instrument [Line Items]
Par value														$ 1,400,669,000				400,000,000		$ 150,000,000
Weighted average coupon										3.81%				3.81%	3.81%
Senior Unsecured Debt \| Canadian dollar Senior unsecured notes \| Subsequent Event
Debt Instrument [Line Items]
Par value													$ 200,000
Senior Unsecured Debt \| Senior Unsecured Syndicated Revolving Credit Facility Maturing On July 12, 2024 \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity										$ 500,000,000
Senior Unsecured Debt \| Senior Unsecured Syndicated Revolving Credit Facility Maturing On February 23, 2023 \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity										500,000,000
Senior Unsecured Debt \| Senior Unsecured Syndicated Revolving Credit Facility Maturing On October 6, 2023 \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity										500,000,000
Senior Unsecured Debt \| Senior Unsecured Revolving Credit Facilities
Debt Instrument [Line Items]
Par value																$ 1,100,000,000
Senior Unsecured Debt \| Senior Unsecured Revolving Credit Facilities \| Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity																										$ 350,000,000
Senior Unsecured Debt \| Senior Unsecured Revolving Credit Facilities \| Ascendant \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt assumed in acquisition																					$ 62,654,000
Senior Unsecured Debt \| Senior unsecured bank credit facilities \| Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity																									$ 1,600,000,000
Number of new credit facilities \| creditFacility																							2		3
Senior Unsecured Debt \| Senior unsecured bank credit facilities \| Ascendant \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt assumed in acquisition																					$ 97,029,000
Number of new credit facilities \| termLoanFacility																					2
Senior Unsecured Debt \| Senior unsecured bank credit facilities \| ESSAL \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt assumed in acquisition		$ 55,786,000																				$ 44,408,558,000
Number of new credit facilities \| creditFacility		7																				7
Senior Unsecured Debt \| U.S. dollar Senior unsecured notes
Debt Instrument [Line Items]
Par value										$ 1,700,000,000														$ 600,000,000
Weighted average coupon										3.46%				3.46%	3.46%
Interest rate (percent)																								2.05%
Senior Unsecured Debt \| Senior Unsecured Debentures Due February 2050
Debt Instrument [Line Items]
Par value																		$ 400,000,000									$ 200,000,000
Interest rate (percent)																		2.85%									3.315%
Senior Unsecured Debt \| Chilean Senior Unsecured Utility Notes
Debt Instrument [Line Items]
Par value															$ 1,753,000
Weighted average coupon										4.18%				4.18%	4.18%
Number of debt instruments repaid \| unsecuredBond		2
Senior Unsecured Debt \| Chilean Senior Unsecured Utility Notes \| ESSAL
Debt Instrument [Line Items]
Debt assumed in acquisition		$ 82,320,000																				$ 1,926,000
Senior Unsecured Debt \| Chilean Senior Unsecured Utility Notes, Series B \| ESSAL
Debt Instrument [Line Items]
Repayments of unsecured debt							$ 116,000		$ 58,000
Interest rate (percent)		6.00%																				6.00%
Senior Unsecured Debt \| Chilean Senior Unsecured Utility Notes, Series C \| ESSAL
Debt Instrument [Line Items]
Interest rate (percent)		2.80%																				2.80%
Senior Unsecured Debt \| U.S. dollar Subordinated unsecured notes
Debt Instrument [Line Items]
Par value										$ 637,500,000																		$ 350,000,000
Weighted average coupon										6.50%				6.50%	6.50%
Senior Unsecured Debt \| U.S. Dollar Senior Unsecured Notes (Green Equity Units)
Debt Instrument [Line Items]
Par value										$ 1,150,000,000
Proceeds from Green Equity Units								$ 1,150,000,000
Weighted average coupon								1.18%		1.18%				1.18%	1.18%
Senior Secured Utility Bonds
Debt Instrument [Line Items]
Number of debt instruments repaid \| utilityNote											2	2
Senior Secured Utility Bonds \| Senior Unsecured Utility Note One
Debt Instrument [Line Items]
Debt repaid upon maturity											$ 45,000,000
Senior Secured Utility Bonds \| Senior Unsecured Utility Note Two
Debt Instrument [Line Items]
Debt repaid upon maturity											$ 30,000,000