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Trade Payables and Other Liabilities - Additional Information (Detail) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Trade and other payables [Abstract] |  |
Deferred consideration | € 511 | € 594
Balance for deferred contingent consideration | 445 | € 380
Maximum possible total payment | € 2,231 |

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- Definition Deferred contingent consideration for acquisitions maximum possible payment until 2022. + References No definition available. + Details
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