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Investment and Return - Schedule of Cash and Cash Equivalents Reconciliation to Cash Flow Statement (Detail) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash and cash equivalents if different from statement of financial position [Abstract]        
Cash and cash equivalents per balance sheet € 3,317 € 3,382    
Less: bank overdrafts (167) (184)    
Add: cash and cash equivalents included in assets held for sale 19      
Cash and cash equivalents per cash flow statement € 3,169 € 3,198 € 2,128 € 1,910