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Derivative financial instruments and hedge accounting - Effects recognized in finance income (loss) (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative financial instruments and hedge accounting      
Income (expense) from derivative financial instruments € 351 € (14) € (307)
Currency      
Derivative financial instruments and hedge accounting      
Income (expense) from derivative financial instruments 391 9 (329)
Interest rate risk      
Derivative financial instruments and hedge accounting      
Income (expense) from derivative financial instruments € (40) € (23) € 22