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Derivative financial instruments and hedge accounting - Additional Information (Details) - EUR (€) € in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivative financial instruments and hedge accounting
Bonds issued	€ 19,816	€ 19,172
Fair value hedges | US Dollars
Derivative financial instruments and hedge accounting
Exchange rate risk deriving from securities	€ 1,335
Hedging instrument	120
Bonds issued	€ 1,546

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- Definition

Disclosure of derivative financial instruments

+ References

No definition available.

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- Definition

Exchange rate risk deriving from securities

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- Definition

The amount of bonds issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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