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Commitments and Contingent Liabilities - Summary of Long-term Finance Lease Commitments (Detail) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of Finance Lease by Lessee [Line Items] |  |
Future minimum lease payments | € 206 | € 220
Finance Cost | 75 | 77
Present value | 131 | 143
Within 1 year [Member] |  |
Disclosure of Finance Lease by Lessee [Line Items] |  |
Future minimum lease payments | 20 | 24
Finance Cost | 9 | 15
Present value | 11 | 9
Later than 1 year but not later than 5 years [Member] |  |
Disclosure of Finance Lease by Lessee [Line Items] |  |
Future minimum lease payments | 68 | 69
Finance Cost | 23 | 28
Present value | 45 | 41
Later than 5 years [Member] |  |
Disclosure of Finance Lease by Lessee [Line Items] |  |
Future minimum lease payments | 118 | 127
Finance Cost | 43 | 34
Present value | 75 | 93
Buildings [Member] |  |
Disclosure of Finance Lease by Lessee [Line Items] |  |
Future minimum lease payments | 195 | 202
Finance Cost | 75 | 75
Present value | 120 | 127
Plant and machinery [Member] |  |
Disclosure of Finance Lease by Lessee [Line Items] |  |
Future minimum lease payments | 11 | 18
Finance Cost | 0 | 2
Present value | € 11 | € 16

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