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Derivative financial instruments and hedge accounting - Additional Information (Details) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Derivative financial instruments and hedge accounting |  |
Bonds | € 19,172 | € 20,094
Fair value hedges | USD |  |
Derivative financial instruments and hedge accounting |  |
Exchange rate risk deriving from securities | € 1,902 |
Hedging instrument | 21 |
Bonds | € 1,844 |

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- Definition Disclosure of derivative financial instruments + References No definition available. + Details
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- Definition Exchange rate risk deriving from securities + References No definition available. + Details
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- Definition The amount of bonds issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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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 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 23B -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_23B_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24A -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24A_d&doctype=Standard -URIDate 2019-03-27 + Details
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