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Fair value of financial instruments - Reconciliation Assets (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Fair value of financial instruments    
Financial assets at beginning of period € 16,069  
Financial assets at end of period 16,493 € 16,069
Level 3 | Private Venture Funds    
Fair value of financial instruments    
Net gains/(losses) in income statement 23 85
At Fair Value-Assets | Level 3    
Fair value of financial instruments    
Financial assets at beginning of period 750 727
Net gains/(losses) in income statement 13 177
Additions 101 69
Deductions (39) (218)
Transfers out of level 3 (4) (7)
Other movements 2 2
Financial assets at end of period € 823 € 750