Fair values - Summary of Disclosure of Borrowings (Details) - EUR (€) € in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Fair Value Measurement [Line Items]
Borrowings	€ 13,140	€ 7,187
Level 2 \| Fair value
Disclosure Of Fair Value Measurement [Line Items]
Borrowings	€ 13,316	€ 7,585

The amount of outstanding funds that the entity is obligated to repay.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard
-URIDate 2021-03-24

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