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Investments - Other investments (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Investments    
Carrying amount at the beginning of the year € 919 € 219
Additions and subscriptions 11 5
Change in the fair value (3) 15
Divestments and reimbursements (12) (22)
Currency translation differences 15 31
Other changes (1) (10)
Carrying amount at the end of the year € 929 919
Increase (decrease) due to application of IFRS 9    
Investments    
Carrying amount at the beginning of the year   681
After initial application    
Investments    
Carrying amount at the beginning of the year   € 900