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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
	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.

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- References

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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
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24B_b_i&doctype=Standard
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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
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-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
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