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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