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Investments - Other investments (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Investments    
Carrying amount at the beginning of the year € 957 € 929
Additions and subscriptions 175 8
Change in the fair value with effect to OCI 105 24
Divestments and reimbursements   (12)
Currency translation differences 57 (61)
Other changes   69
Carrying amount at the end of the year € 1,294 € 957