Note 12 Financial Instruments Designated At Fair Value Through Profit Or Loss (Details) - EUR (€) € in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Financial assets and liabilities designated at fair value through profit or loss [Line Items]
Debt securities at fair value through profit or loss	€ 1,006	€ 836	€ 955
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently	1,006	836	955
Customer deposits designated at fair value through profit or loss, designated upon initial recognition or subsequently	897	934	717
Debt securities at fair value through profit or loss	5,997	4,597	3,977
Other Financial liabilities at fair value through profit or loss, designated upon initial recognition or subsequently	11,524	9,420	8,605
Financial liabilities at fair value through profit or loss, designated upon initial recognition or subsequently	€ 18,417	€ 14,952	€ 13,299

Debt securities at fair value through profit or loss designated upon initial recognition or subsequently

No definition available.

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- Definition

Financial assets and liabilities designated at fair value through profit or loss

+ References

No definition available.

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- Definition

Other Financial liabilities at fair value through profit or loss, designated upon initial recognition or subsequently

+ References

No definition available.

+ Details

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- Definition

The amount of instruments issued by the entity that represent indebtedness at fair value through profit or loss that were designated as such upon initial recognition or subsequently. [Refer: Financial liabilities at fair value through profit or loss, designated upon initial recognition or subsequently]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard
-URIDate 2025-03-27

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- Definition

The amount of deposit liabilities from customers held by the entity at fair value through profit or loss that were designated as such upon initial recognition or subsequently. [Refer: Financial liabilities at fair value through profit or loss, designated upon initial recognition or subsequently]

+ References

+ Details

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- Definition

The amount of financial assets at fair value through profit or loss that were designated as such upon initial recognition or subsequently. [Refer: At fair value [member]; Financial assets at fair value through profit or loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 8
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_8_a&doctype=Standard
-URIDate 2025-03-27

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- Definition

The amount of financial liabilities at fair value through profit or loss that were designated as such upon initial recognition or subsequently. [Refer: At fair value [member]; Financial liabilities at fair value through profit or loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 8
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_8_e&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 44
-Subparagraph b
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_44_b_i&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 44
-Subparagraph b
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_44_b_i&doctype=Standard
-URIDate 2025-03-27

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