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Trade Receivables and Other - Disclosure of Gross Investments In Leases To Net Investment Leases (Detail) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of finance lease by lessor [line Items]    
Year ended Gross Investment in the lease € 12 € 19
Unearned Interest Income   (1)
Net investment in the lease 12 18
Less than 1 year [member]    
Disclosure of finance lease by lessor [line Items]    
Year ended Gross Investment in the lease 6 7
Unearned Interest Income   (1)
Net investment in the lease 6 6
Between 1 and 5 years [member]    
Disclosure of finance lease by lessor [line Items]    
Year ended Gross Investment in the lease 6 12
Net investment in the lease € 6 € 12