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Fair value of financial instruments - Reconciliation Assets (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair value of financial instruments    
Financial assets at beginning of period € 16,493  
Adoption of IFRS 9   € (54)
Financial assets at end of period 13,035 16,493
Level 3 | Private Venture Funds    
Fair value of financial instruments    
Net gains/(losses) in income statement (96) 63
At Fair Value-Assets | Level 3    
Fair value of financial instruments    
Financial assets at beginning of period 552 674
Net gains/(losses) in income statement 49 89
Net loss recorded in other comprehensive income   (89)
Purchases 119 89
Sales (150) (182)
Other movements (4) (29)
Adoption of IFRS 9   122
Financial assets balance restated   674
Financial assets at end of period € 688 € 552