Derivatives - Credit Derivative Disclosure By Quality (Detail) - EUR (€) € in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disclosure of internal credit grades [Line Items]
Notional	€ 1,766	€ 3,851	€ 4,043
Fair value	27	68	€ 71
AAA [member]
Disclosure of internal credit grades [Line Items]
Notional	4	4
AA [member]
Disclosure of internal credit grades [Line Items]
Notional	26	111
Fair value	0	1
A [member]
Disclosure of internal credit grades [Line Items]
Notional	699	1,233
Fair value	1	16
BBB [member]
Disclosure of internal credit grades [Line Items]
Notional	934	2,310
Fair value	25	50
BB [member]
Disclosure of internal credit grades [Line Items]
Notional	41	141
Fair value	0	1
B or lower [member]
Disclosure of internal credit grades [Line Items]
Notional	62	€ 51
Fair value	€ 1

The fair value of a credit derivative. [Refer: At fair value [member]; Derivatives [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 24G
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24G_a&doctype=Standard
-URIDate 2025-03-27

+ Details

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

- Definition

The nominal amount of a credit derivative. [Refer: Derivatives [member]]

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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