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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, 2021 EUR (€) | Dec. 31, 2020 EUR (€)
Derivative financial instruments and hedge accounting |  |
Nominal amount of the hedging instrument | 741 | (1,362)
Change in fair value (effective hedge) | € (1,479) | € (280)
Change in fair value (ineffective hedge) | € (51) | € (1)
Commodity price risk |  |
Derivative financial instruments and hedge accounting |  |
Nominal amount of the hedging instrument | 825 | (1,362)
Change in fair value (effective hedge) | € (1,482) | € (280)
Change in fair value (ineffective hedge) | € (51) | € (1)
Commodity price risk | Over the counter contract |  |
Derivative financial instruments and hedge accounting |  |
Nominal amount of the hedging instrument | 461 | (821)
Change in fair value (effective hedge) | € (2,016) | € (438)
Change in fair value (ineffective hedge) | € (46) |
Commodity price risk | Futures contract |  |
Derivative financial instruments and hedge accounting |  |
Nominal amount of the hedging instrument | 364 | (541)
Change in fair value (effective hedge) | € 534 | € 158
Change in fair value (ineffective hedge) | € (5) | € (1)
Interest rate risk |  |
Derivative financial instruments and hedge accounting |  |
Nominal amount of the hedging instrument | (84) |
Change in fair value (effective hedge) | € 3 |
Interest rate risk | Interest rate swap contract |  |
Derivative financial instruments and hedge accounting |  |
Nominal amount of the hedging instrument | (84) |
Change in fair value (effective hedge) | € 3 |

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- Definition Disclosure of derivative financial 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 2021-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24C_b_ii&doctype=Standard -URIDate 2021-03-24 + 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 IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 24C -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24C_b_i&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 24E -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24E_a&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_91_a&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 23 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_23_c&doctype=Standard&book=b -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 23B -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_23B_a&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 24A -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24A_d&doctype=Standard -URIDate 2021-03-24 + Details
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