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Property Plant and Equipment - Summary of Future Aggregate Minimum Lease Payments Under Non-cancellable Finance Leases (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [line items]    
Future aggregate minimum lease payments under non-cancellable finance leases € 86 € 71
Present value of future aggregate minimum lease payments under non-cancellable finance leases 73 60
Less than 1 year [member]    
Disclosure of finance lease and operating lease by lessee [line items]    
Future aggregate minimum lease payments under non-cancellable finance leases 20 15
Present value of future aggregate minimum lease payments under non-cancellable finance leases 17 14
Expiring within 5 years [member]    
Disclosure of finance lease and operating lease by lessee [line items]    
Future aggregate minimum lease payments under non-cancellable finance leases 50 37
Present value of future aggregate minimum lease payments under non-cancellable finance leases 42 30
More than 5 years [member]    
Disclosure of finance lease and operating lease by lessee [line items]    
Future aggregate minimum lease payments under non-cancellable finance leases 16 19
Present value of future aggregate minimum lease payments under non-cancellable finance leases € 14 € 16