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Equity - Distribution of Profit - Additional Information (Details) - € / shares |  | 12 Months Ended
--- | --- | ---
May 24, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Preference shares, preferred dividend |  |  |
Equity |  |  |
Dividends paid, per share (in Euros per share) | € 0.01 | € 0.01 | € 0.01

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- Definition Dividends paid to equity holders of parent, classified as financing activities, final dividend, per share. + References No definition available. + Details
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- 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
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=grfs_PreferenceSharesPreferredDividendMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |