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Capital and Funding - Reconciliation of Liabilities Arising from Financing Activities (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial liabilities [Line Items]    
Opening balance € (16,595) € (14,643)
Cash Movement (8,860) (1,788)
Business Acquisitions/ Disposals (3)  
Foreign exchange changes 1,450 (211)
Fair value changes (238) (64)
Other movements (184) 111
Closing balance (24,430) (16,595)
Preference Shares Liabilities [member]    
Disclosure of financial liabilities [Line Items]    
Opening balance (68) (68)
Cash Movement 68  
Closing balance   (68)
Bank Loans and Overdrafts [member]    
Disclosure of financial liabilities [Line Items]    
Opening balance (1,146) (1,064)
Cash Movement 66 (23)
Business Acquisitions/ Disposals (3)  
Foreign exchange changes 98 (42)
Other movements (7) (17)
Closing balance (992) (1,146)
Bonds and Other Loans [Member]    
Disclosure of financial liabilities [Line Items]    
Opening balance (15,053) (12,703)
Cash Movement (9,008) (2,089)
Foreign exchange changes 1,346 (190)
Fair value changes (2) (3)
Other movements 8 (68)
Closing balance (22,709) (15,053)
Finance lease creditors [member]    
Disclosure of financial liabilities [Line Items]    
Opening balance (143) (195)
Cash Movement 14 35
Foreign exchange changes 6 21
Other movements (8) (4)
Closing balance (131) (143)
Derivatives [member]    
Disclosure of financial liabilities [Line Items]    
Opening balance (185) (124)
Fair value changes (236) (61)
Closing balance (421) (185)
Other financials liabilities [member]    
Disclosure of financial liabilities [Line Items]    
Opening balance   (489)
Cash Movement   289
Other movements (177) € 200
Closing balance € (177)