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Financial Risks - Summary of Composition of Impairment Losses and Recoveries (Parenthetical) (Detail) - EUR (€) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of impairment loss recognised or reversed [line items] |  |
Net impairments and (recoveries) | € (17,000,000) | € (10,000,000)
Bottom of range [member] |  |
Disclosure of impairment loss recognised or reversed [line items] |  |
Net impairments and (recoveries) | € 25,000,000 | € 25,000,000

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- Definition Net impairments and (recoveries). + References No definition available. + Details
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Balance Type: | debit
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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |