Name:	aby_BatteryCapacity
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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

Name:	aby_BusinessAcquisitionAbstract
Namespace Prefix:	aby_
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The rated electric power generation capacity in Megawatts (MW) or Kilovolts (kV) of a power generation facility.

No definition available.

Name:	aby_Capacity
Namespace Prefix:	aby_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The period over which the interest from debt is capitalized.

No definition available.

Name:	aby_CapitalizationPeriodInterest
Namespace Prefix:	aby_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The percentage of the principal amount of debt paid upfront upon drawdown of the facility.

No definition available.

Name:	aby_DebtIssuanceCostUpfrontFeePercentage
Namespace Prefix:	aby_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Date the declared dividend will be paid, in CCYY-MM-DD format.

No definition available.

Name:	aby_DividendPayableDateToBePaidDayMonthAndYear1
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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

Name:	aby_DividendsProposedOrDeclaredBeforeFinancialStatementsAbstract
Namespace Prefix:	aby_
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The rated electric power generation capacity in Megawatts (MW) or Kilovolts (kV) of a power generation facility that is generated by the facility through sustained output.

No definition available.

Name:	aby_InstalledCapacity
Namespace Prefix:	aby_
Data Type:	xbrli:integerItemType
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The interest rate on interest rate swap agreements.

No definition available.

Name:	aby_InterestRateSwapInterestRateBasis
Namespace Prefix:	aby_
Data Type:	num:percentItemType
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Period Type:	instant

Refers to the period on an interest rate swap.

No definition available.

Name:	aby_InterestRateSwapPeriod
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Data Type:	xbrli:durationItemType
Balance Type:	na
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The 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 credit facility.

No definition available.

Name:	aby_MaximumBorrowingCapacityLineOfCreditFacility
Namespace Prefix:	aby_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The number of corporations that are counterparties to a contract with the entity.

No definition available.

Name:	aby_NumberOfCorporationsContracted
Namespace Prefix:	aby_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The percentage of interests acquired in a business combination.

No definition available.

Name:	aby_OwnershipPercentageAcquired
Namespace Prefix:	aby_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The ownership percentage to be acquired under a Right of First Offer agreement with the sellers of the assets.

No definition available.

Name:	aby_RightOfFirstOfferAgreementOwnershipPercentageToBeAcquired
Namespace Prefix:	aby_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Period of contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	aby_TermOfContract
Namespace Prefix:	aby_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Term of the interest rate that fluctuates over time as a result of an underlying benchmark interest rate or index.

No definition available.

Name:	aby_TermOfVariableRate
Namespace Prefix:	aby_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard
-URIDate 2018-03-16

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Data Type:	num:percentItemType
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The maturity of borrowings. [Refer: Borrowings]

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Data Type:	xbrli:stringItemType
Balance Type:	na
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The amount recognised as of the acquisition date for contingent consideration arrangements assumed and indemnification assets acquired in a business combination. [Refer: Business combinations [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2018-01-01
-Paragraph B64
-Subparagraph g
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_g_i&doctype=Appendix&seq=2
-URIDate 2018-03-16

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

Name:	ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
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The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 137
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_137_a&doctype=Standard
-URIDate 2018-03-16

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Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_BusinessCombinationsAxis=aby_MonterreyMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	ifrs-full_BorrowingsByNameAxis=aby_SeniorNoteIssuanceFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
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