Name:	aby_BusinessAcquisitionAbstract
Namespace Prefix:	aby_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

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

No definition available.

Name:	aby_DividendPayableDateToBePaidDayMonthAndYear1
Namespace Prefix:	aby_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

No definition available.

Name:	aby_DividendsPayableDateOfRecordDayMonthAndYear1
Namespace Prefix:	aby_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

Name:	aby_DividendsProposedOrDeclaredBeforeFinancialStatementsAbstract
Namespace Prefix:	aby_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The standard gas compression capacity of the facility.

No definition available.

Name:	aby_FlowCapacityGasCompressionCapacity
Namespace Prefix:	aby_
Data Type:	us-types:flowItemType
Balance Type:	na
Period Type:	duration

The number of contracted assets acquired by the Company during the period.

No definition available.

Name:	aby_NumberOfContractedAssetsAcquired
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 remaining ownership percentage to be acquired one year after the commercial operation date (COD).

No definition available.

Name:	aby_RemainingOwnershipPercentageToBeAcquiredOneYearAfterCommercialOperationDate
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

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

Name:	ifrs-full_ContingentConsiderationArrangementsAndIndemnificationAssetsRecognisedAsOfAcquisitionDate
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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