Shareholders' equity - Perpetual subordinated notes (Details) - Subordinated note, 2.708%, perpetual maturity callable after 6.6 years € in Millions	May 05, 2023 EUR (€)
Shareholders' equity
Reimbursement of nominal amount	€ 1,000
Interest rate (as percent)	2.708%

The cash outflow for repayments of subordinated liabilities. [Refer: Subordinated liabilities]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2022-03-24
-Paragraph 17
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_17&doctype=Standard
-URIDate 2022-03-24

Name:	ifrs-full_RepaymentsOfSubordinatedLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration