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Derivative Financial Instruments and Risk Management Policies - Breakdown of Financial Results (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial assets [line items]      
Other financial income € 4,833 € 4,715 € 5,235
Total 52,008 52,036 54,916
Subtotal 505 3,401  
Subtotal (3,363) (4,476) (4,417)
Hedging gains (losses) for hedge of group of items with offsetting risk positions 184    
Derivative instruments      
Disclosure of financial assets [line items]      
Interest income 638 723 1,068
Dividends received 16 19 30
Other financial income 17 38 250
Total 671 780 1,348
Changes in fair value of financial assets at fair value through profit or loss 35 438 (317)
Changes in fair value of financial liabilities at fair value through profit or loss (97) (463) 189
Transfer from equity to profit and loss from cash flow hedges (162) (238) (207)
Transfer from equity to profit and loss from available-for-sale assets and others (33) (136) 539
Gain/(loss) on fair value hedges (150) (26) 62
(Loss)/gain on adjustment to items hedged by fair value hedges 194 (6) 24
Subtotal (213) (431) 290
Interest expenses (1,975) (2,225) (3,146)
Ineffective portion of cash flow hedges (10) 1 0
Accretion of provisions and other liabilities (453) (466) (313)
Other financial expenses (310) (365) (520)
Subtotal (2,748) (3,055) (3,979)
Net finance costs excluding foreign exchange differences and hyperinflationary adjustments € (2,290) € (2,706) € (2,341)