Fee and Commission Income - Additional Information (Detail) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fee and commission income (expense) [abstract]
Fee and commission income on trust and fiduciary activities	€ 242	€ 259	€ 221

The amount of fee income and expense (other than the amounts included when determining the effective interest rate) arising from trust and other fiduciary activities that result in the holding or investing of assets on behalf of individuals, trusts, retirement benefit plans and other institutions.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 20
-Subparagraph c
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_20_c_ii&doctype=Standard
-URIDate 2022-03-24

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