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Fair value of financial instruments - Reconciliation Assets (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair value of financial instruments      
Financial assets at beginning of period € 13,035    
Adoption of IFRS 9   € 4 € (54)
Financial assets at end of period 12,381 13,035  
Level 3 | Private Venture Funds      
Fair value of financial instruments      
Net gains/(losses) in income statement 73 (96)  
At Fair Value-Assets | Level 3      
Fair value of financial instruments      
Financial assets at beginning of period 688 552  
Adoption of IFRS 9   122  
Financial assets balance restated   674  
Net gains/(losses) in income statement 49 49  
Additions 90 119  
Deductions (79) (150)  
Other movements (2) (4)  
Financial assets at end of period € 746 € 688