No definition available.

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

- Definition

The minimum percentage of ownership in a concessional asset required that will trigger a change of ownership clause for project financing arrangements.

+ References

No definition available.

+ Details

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

- Definition

The percentage of outstanding shares of the entity that are pledged as collateral under various financing arrangements.

+ References

No definition available.

+ Details

Name:	aby_PercentageOfOutstandingSharesPledgedAsCollateral
Namespace Prefix:	aby_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The proportion of ownership interests in the parent held by a subsidiary.

+ References

No definition available.

+ Details

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

- Definition

The approved percentage of creditor support above the statutory limit of 75% of financial liability of the entity for obtaining refinancing of the entity's financial debt.

+ References

No definition available.

+ Details

Name:	aby_RefinancingAgreementPercentageOfCreditorSupportAboveStatutoryLimitApproved
Namespace Prefix:	aby_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Refers to the remaining ownership percentage that entity intends to sell in a private transaction.

+ References

No definition available.

+ Details

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

- Definition

This element represents sale of ownership stake in percentage.

+ References

No definition available.

+ Details

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

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2016-01-13
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard
-URIDate 2016-03-31

+ Details

Name:	ifrs-full_NotionalAmount
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_BorrowingsByNameAxis=aby_NoteIssuanceFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	ifrs-full_IntangibleAssetsMaterialToEntityAxis=aby_SolanaAndMojaveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Nature of the business, Financing arrangements (Details) € in Millions, $ in Millions		1 Months Ended	12 Months Ended
	Nov. 01, 2017	Nov. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Feb. 10, 2017 USD ($)	Feb. 10, 2017 EUR (€)	Feb. 03, 2017
Note Issuance Facility [Member]
Financing arrangements [Abstract]
Principal amount					$ 330	€ 275
Abengoa [Member]
Financing arrangements [Abstract]
Percentage of financial liabilities approved							94.00%
Minimum ownership requirement percentage		30.00%		35.00%
Ownership interest			41.47%
Percentage of outstanding shares pledged as collateral			41.44%
Stake in parent to be sold to Algonquin	25.00%
Remaining ownership percentage	16.50%
Abengoa [Member] \| Solana and Mojave [Member]
Financing arrangements [Abstract]
Minimum ownership requirement percentage		16.00%	30.00%