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Significant accounting policies - Impact of IFRS 9 on other non-current financial assets (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Significant accounting policies - Text Details (Detail) [Line Items]        
Non-current financial assets measured at fair value through other comprehensive income € 198   € 369 [1]  
Non-current financial assets at amortised cost 46   114 [1],[2]  
Other non-current financial assets, total 360   587 [1]  
Non-current financial assets at fair value through profit or loss € 116   104 [1]  
IFRS 9 adoption impact [member]        
Significant accounting policies - Text Details (Detail) [Line Items]        
Non-current financial assets measured at fair value through other comprehensive income   € 369    
Non-current financial assets at fair value through profit or loss   104    
Reclassify investments from available-for-sale to FVTPL   587    
Current financial assets at amortised cost [2]   114    
Financial assets at amortised cost, category [member] | IFRS 9 adoption impact [member]        
Significant accounting policies - Text Details (Detail) [Line Items]        
Reclassify held-to-maturity investments to amortized cost [2]   1    
Financial assets at fair value through other comprehensive income, category [member] | IFRS 9 adoption impact [member]        
Significant accounting policies - Text Details (Detail) [Line Items]        
Reclassify investments from available-for-sale to FVTPL   (77)    
Financial assets at fair value through profit or loss, category [member]        
Significant accounting policies - Text Details (Detail) [Line Items]        
Other non-current financial assets, total     27 € 27
Financial assets at fair value through profit or loss, category [member] | IFRS 9 adoption impact [member]        
Significant accounting policies - Text Details (Detail) [Line Items]        
Reclassify investments from available-for-sale to FVTPL   77    
Held-to-maturity investments, category [member]        
Significant accounting policies - Text Details (Detail) [Line Items]        
Other non-current financial assets, total     € 1 € 2
Held-to-maturity investments, category [member] | IFRS 9 adoption impact [member]        
Significant accounting policies - Text Details (Detail) [Line Items]        
Other non-current financial assets, total   € (1)    
[1] Refer to IFRS 9 disclosure in Significant accounting policies note for the impact of IFRS 9 on 2018 opening balance.
[2] Previously reported as loans and receivables.