v3.19.1

Nature of the business, Description (Details) - Algonquin [Member]			1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 27, 2018	Mar. 09, 2018	Mar. 31, 2018	Mar. 31, 2019	Dec. 31, 2018
Nature of the business [Abstract]
Percentage of non-controlling interests	16.47%	25.00%
Ownership interest			25.00%	41.47%	41.47%

X

- References

No definition available.

+ Details

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

X

- Definition

The proportion of ownership interests in the entity held by non-controlling interests.

+ References

No definition available.

+ Details

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

X

- Definition

The proportion of ownership interests in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2018-01-01
-Paragraph 12
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_12_c&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_ProportionOfOwnershipInterestsHeldByNoncontrollingInterests
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=aby_AlgonquinMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: