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Finance debts - Fair value of long-term debt (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Long-term debt and current portion of long-term debt    
Borrowings    
Financial liabilities, at fair value € 26,970 € 22,528
Long-term and current portion of long-term ordinary bonds    
Borrowings    
Financial liabilities, at fair value 22,429 19,173
Long-term and current portion of long-term convertible bonds    
Borrowings    
Financial liabilities, at fair value 497 402
Long-term and current portion of long-term bank debt    
Borrowings    
Financial liabilities, at fair value 4,008 2,904
Long-term and current portion of long-term debt with other financial institutions    
Borrowings    
Financial liabilities, at fair value € 36 € 49