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Derivative financial instruments and hedge accounting - Underlying asset or liability by type of risk hedged under cash flow hedge (Details) - Cash flow hedge derivatives - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Cash flow hedges [abstract] |  |
Change of underlying asset used for calculation of hedging ineffectiveness | € (169) | € 4,044
CFH reserve | 50 | (483)
Reclassification adjustments on cash flow hedges, before tax | (436) | (4,677)
Commodity price risk |  |
Cash flow hedges [abstract] |  |
Change of underlying asset used for calculation of hedging ineffectiveness | (169) | 4,059
CFH reserve | 56 | (499)
Reclassification adjustments on cash flow hedges, before tax | (436) | (4,666)
Commodity price risk | Planned sales |  |
Cash flow hedges [abstract] |  |
Change of underlying asset used for calculation of hedging ineffectiveness | (169) | 4,059
CFH reserve | 56 | (499)
Reclassification adjustments on cash flow hedges, before tax | (436) | (4,666)
Interest rate risk |  |
Cash flow hedges [abstract] |  |
Change of underlying asset used for calculation of hedging ineffectiveness | (19) | (15)
CFH reserve | (6) | 16
Reclassification adjustments on cash flow hedges, before tax |  | (11)
Interest rate risk | Hedged flows |  |
Cash flow hedges [abstract] |  |
Change of underlying asset used for calculation of hedging ineffectiveness | (19) | (15)
CFH reserve | € (6) | 16
Reclassification adjustments on cash flow hedges, before tax |  | € (11)

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- Definition The amount of cash flow hedge reserve, before tax. + References No definition available. + Details
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- References No definition available. + Details
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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of reclassification adjustments related to cash flow hedges, before tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 92 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_92&doctype=Standard -URIDate 2023-03-23 + Details
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- Details
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