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Financial Liabilities - Promissory Notes (Details) - EUR (€) | Dec. 31, 2019 | Dec. 31, 2018
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Promissory Notes Maturing May 2019 |  |
Borrowings |  |
Nominal amount of promissory notes |  | € 3,000
Borrowings, interest rate |  | 4.00%
Promissory notes subscribed |  | € 99,990,000
Buy back |  | (1,041,000)
Interest pending accrual |  | € (1,304,000)
Promissory Notes Maturing May 2020 |  |
Borrowings |  |
Nominal amount of promissory notes | € 3,000 |
Borrowings, interest rate | 5.00% |
Promissory notes subscribed | € 103,122,000 |
Buy back | (1,170,000) |
Interest pending accrual | € (1,686,000) |

X
- Definition The gross amount of short-term borrowings. + References No definition available. + Details
Name: | grfs_CurrentBorrowingsGross
Namespace Prefix: | grfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The nominal or face amount of each individual promissory note. + References No definition available. + Details
Name: | grfs_NotionalAmountOfIndividualPromissoryNote
Namespace Prefix: | grfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The buy back amount related to the promissory notes. + References No definition available. + Details
Name: | grfs_PromissoryNotesBuyBackAmount
Namespace Prefix: | grfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The pending interest accrual related to the promissory notes. + References No definition available. + Details
Name: | grfs_PromissoryNotesInterestPendingAccrual
Namespace Prefix: | grfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_BorrowingsInterestRate
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=grfs_PromissoryNotesMaturingMay2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=grfs_PromissoryNotesMaturingMay2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |