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Subsequent Events - Consequences due to COVID-19 (Details) | 12 Months Ended
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Dec. 31, 2019
Consequences due to COVID-19 |
Disclosure of non-adjusting events after reporting period [line items] |
Minimum period for inventory levels to support operations | 6 months

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- Definition Minimum period for inventory levels to support operations, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
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_NonadjustingEventsAfterReportingPeriodAxis=grfs_ConsequencesDueToCovid19Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |