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Net Finance Costs - Summary of Net Finance Costs (Parenthetical) (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Detailed Information About Finance Income Expense [abstract] |  |
Unwinding of discount | € (26) | € 0
Provision for interest on indirect tax | € 65 | € 0

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- Definition Disclosure of detailed information about finance income (expense). + References No definition available. + Details
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- Definition Provision for interest on indirect tax. + References No definition available. + Details
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- Definition Unwinding discount on deferred consideration. + References No definition available. + Details
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