Financial assets at fair value through profit or loss - Summary of trading assets (Details) - EUR (€) € in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of fair value measurement of assets [line items]
Trading assets	€ 60,229	€ 56,870
Debt securities
Disclosure of fair value measurement of assets [line items]
Trading assets	6,907	4,189
Equity securities
Disclosure of fair value measurement of assets [line items]
Trading assets	15,412	11,737
Derivatives
Disclosure of fair value measurement of assets [line items]
Trading assets	25,680	30,841
Loans and receivables
Disclosure of fair value measurement of assets [line items]
Trading assets	€ 12,231	€ 10,103

The amount of financial assets at fair value through profit or loss classified as held for trading. A financial asset is classified as held for trading if: (a) it is acquired principally for the purpose of selling it in the near term; (b) on initial recognition it is part of a portfolio of identified financial instruments that are managed together and for which there is evidence of a recent actual pattern of short-term profit-taking; or (c) it is a derivative (except for a derivative that is a financial guarantee contract or a designated and effective hedging instrument). [Refer: At fair value [member]; Financial assets at fair value through profit or loss]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard
-URIDate 2023-03-23

Name:	ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant