Advance payments classified as current.

No definition available.

Name:	grfs_AdvancesCurrent
Namespace Prefix:	grfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of finance costs associated with the sale of receivables.

+ References

No definition available.

+ Details

Name:	grfs_FinanceCostsSaleOfReceivables
Namespace Prefix:	grfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Maximum period within which the performance obligation will be fulfilled by the entity.

+ References

No definition available.

+ Details

Name:	grfs_PerformanceObligationMaximumFulfillmentPeriod
Namespace Prefix:	grfs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate of advanced collection of nominal amounts, sale of receivables arrangement

+ References

No definition available.

+ Details

Name:	grfs_RateOfAdvancedCollectionOfNominalAmountsSaleOfReceivablesArrangement
Namespace Prefix:	grfs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate of insolvency risk coverage on the factor side, sale of receivables arrangement

+ References

No definition available.

+ Details

Name:	grfs_RateOfInsolvencyRiskCoverageOnFactorSideSaleOfReceivablesArrangement
Namespace Prefix:	grfs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of days considered as due date for receivables.

+ References

No definition available.

+ Details

Name:	grfs_ReceivablesDueDateNumberOfDays
Namespace Prefix:	grfs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	grfs_TradeAndOtherReceivablesLineItem
Namespace Prefix:	grfs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The volume of invoices sold without recourse to various financial institutions which, based on their due date would not have been collected as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	grfs_VolumeOfInvoicesSoldWithoutRecourseToVariousFinancialInstitutionsWhichWouldNotHaveBeenCollected
Namespace Prefix:	grfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Total for all joint operations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2025-01-01
-Paragraph 21
-Subparagraph a
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_ProportionOfOwnershipInterestInJointOperation
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ifrs-full_JointOperationsAxis=grfs_BiotekAmericaLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=grfs_BiotestAgMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Trade and Other Receivables - Current contract assets and other receivable (Details) - EUR (€) € in Millions		1 Months Ended	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2021	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Trade and Other Receivables
Advance payments			€ 7	€ 6
Finance costs from sale of receivables			14	31	€ 25
Volume of invoices sold without recourse to various financial institutions which would not have been collected			€ 325	€ 312
Biotek America LLC
Trade and Other Receivables
Proportion of ownership interest in joint arrangement	75.00%	75.00%
Biotest AG
Trade and Other Receivables
Performance obligation, Maximum fulfillment period			12 months
Minimum
Trade and Other Receivables
Receivables due date, Number of days			60 days
Rate of advanced collection of nominal amounts, sale of receivables arrangement			70.00%	70.00%	70.00%
Rate of insolvency risk coverage on the factor side, sale of receivables arrangement			90.00%	90.00%	90.00%
Maximum
Trade and Other Receivables
Receivables due date, Number of days			120 days
Rate of advanced collection of nominal amounts, sale of receivables arrangement			100.00%	100.00%	100.00%
Rate of insolvency risk coverage on the factor side, sale of receivables arrangement			100.00%	100.00%	100.00%