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Financial Risks - Summary of Shares Cost Prior to Impairment (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Impairment Losses On Shares [abstract] |  |
Shares | € (2) | € (5)

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- Definition Disclosure Of Impairment Losses On Shares [abstract]. + References No definition available. + Details
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- Definition Treasury stock value eliminated. + References No definition available. + Details
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