Note 15 - Financial assets at fair value through OCI (Detail) - Financial assets at fair value through OCI [Member] - EUR (€) € in Millions	Dec. 31, 2022	Dec. 31, 2021
Financial assets at fair value through OCI [Line Items]
Securities purchased under resale agreement	€ 2,156	€ 1,231
Debt securities [Abstract]:
German government	602	876
U.S. Treasury and U.S. government agencies	12,334	8,770
U.S. local (municipal) governments	392	253
Other foreign governments	9,960	10,965
Corporates	708	604
Other asset-backed securities	0	0
Mortgage-backed securities, including obligations of U.S. federal agencies	486	714
Other debt securities	969	1,194
Total debt securities	25,450	23,377
Loans	4,069	4,370
Total financial assets at fair value through other comprehensive income	€ 31,675	€ 28,979

The amount of financial assets that are measured at fair value through other comprehensive income. A financial asset shall be measured at fair value through other comprehensive income if both of the following conditions are met: (a) the financial asset is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets and (b) the contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. [Refer: At fair value [member]; Financial assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 8
-Subparagraph h
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_8_h&doctype=Standard
-URIDate 2022-03-24

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