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Derivative financial instruments and hedge accounting - Hedging derivative instruments (Details) - Cash flow hedge derivatives € in Millions | 12 Months Ended
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Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€)
Derivative financial instruments and hedge accounting |  |
Nominal amount of hedging instruments | 438 | 1,560
Change in fair value (effective hedge) | € 105 | € (3,883)
Change in fair value (ineffective hedge) | € 6 | € 275
Commodity price risk |  |
Derivative financial instruments and hedge accounting |  |
Nominal amount of hedging instruments | 310 | 1,433
Change in fair value (effective hedge) | € 124 | € (3,907)
Change in fair value (ineffective hedge) | € 6 | € 275
Commodity price risk | Over the counter contract |  |
Derivative financial instruments and hedge accounting |  |
Nominal amount of hedging instruments | 310 | 83
Change in fair value (effective hedge) | € 147 | € (4)
Change in fair value (ineffective hedge) | 6 |
Commodity price risk | Futures contract |  |
Derivative financial instruments and hedge accounting |  |
Nominal amount of hedging instruments |  | 1,350
Change in fair value (effective hedge) | € (23) | € (3,912)
Change in fair value (ineffective hedge) |  | 275
Commodity price risk | Options |  |
Derivative financial instruments and hedge accounting |  |
Change in fair value (effective hedge) |  | € 9
Interest rate risk |  |
Derivative financial instruments and hedge accounting |  |
Nominal amount of hedging instruments | 128 | 127
Change in fair value (effective hedge) | € (19) | € 24
Interest rate risk | Interest rate swap contract |  |
Derivative financial instruments and hedge accounting |  |
Nominal amount of hedging instruments | 128 | 127
Change in fair value (effective hedge) | € (19) | € 24

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- Definition The nominal amount of a hedging instruments. + References No definition available. + Details
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- Definition The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24C_b_ii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The gains (losses) recognised in other comprehensive income on cash flow hedges, net of tax, before reclassification adjustments. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 91 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_91_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24C -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24C_b_i&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24E -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24E_a&doctype=Standard -URIDate 2023-03-23 + Details
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