Shareholders' equity - Perpetual subordinated notes (Details) - Perpetual subordinated note, 2.625%, maturity callable after 10 years € in Millions	1 Months Ended
Feb. 28, 2025 EUR (€)
Shareholders' equity
Redemption of outstanding nominal amount	€ 1,082
Interest rate (as percent)	2.625%

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 2024-01-01
-Paragraph 17
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17&doctype=Standard
-URIDate 2024-03-27

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