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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, 2020	Dec. 31, 2019
Cash flow hedges [abstract]
Change of underlying asset used for calculation of hedging ineffectiveness	€ 284	€ 1,444
CFH reserve	(7)	(656)
Reclassification adjustments on cash flow hedges, before tax	(941)	(739)
Commodity price risk | Planned sales
Cash flow hedges [abstract]
Change of underlying asset used for calculation of hedging ineffectiveness	284	1,444
CFH reserve	(7)	(656)
Reclassification adjustments on cash flow hedges, before tax	€ (941)	€ (739)

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- Definition

Cash flow hedge reserve, before tax

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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
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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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