Fair values - Summary of the Fair Value of Assets and Liabilities (Details) - EUR (€) € in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets at fair value:
Derivatives (Note 13)	€ 376	€ 46
Liabilities at fair value:
Derivatives (Note 13)	€ 66	€ 77

The amount of a hedging instrument, recognised as a liability. [Refer: Hedging instruments [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 24A
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24A_a&doctype=Standard
-URIDate 2021-03-24

Name:	ifrs-full_HedgingInstrumentLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant