v3.19.3

Nature of the business, Description (Details)					1 Months Ended	9 Months Ended
	May 31, 2019	May 22, 2019	Nov. 27, 2018	Mar. 09, 2018	Mar. 31, 2018	Sep. 30, 2019
Nature of the business [Abstract]
Ownership interest	44.20%
Algonquin [Member]
Nature of the business [Abstract]
Percentage of non-controlling interests			16.47%	25.00%
Ownership interest		42.27%			25.00%	44.20%

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 2019-01-01
-Paragraph 12
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_12_c&doctype=Standard
-URIDate 2019-03-27

+ 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: