Note 9 Financial assets and liabilities held for trading (Details) - EUR (€) € in Millions	Jun. 30, 2026	Dec. 31, 2025
Disclosure of financial assets held for trading [Line Items]
Derivative financial assets held for trading	€ 38,807	€ 32,551
Equity instruments held at fair value through profit or loss, classified as held for trading	12,181	9,901
Debt instruments held for trading	36,343	30,846
Loans and advances at fair value through profit or loss, classified as held for trading	67,363	49,887
Loans and advances to central banks held for trading	1,074	620
Loans and advances to banks held for trading	31,774	17,985
Loans and advances to customers held for trading assets	34,515	31,282
Current financial assets at fair value through profit or loss, classified as held for trading	154,695	123,185
Derivative financial liabilities held for trading	36,160	30,345
Short positions held for trading	13,751	13,100
Deposits at fair value through profit or loss that meet definition of held for trading	69,478	48,472
Deposits from central banks held for trading	5,947	3,653
Deposits from credit institutions held for trading	21,683	18,138
Customer deposits held for trading	41,848	26,681
Current financial liabilities at fair value through profit or loss, classified as held for trading	119,389	91,917
Reverse repurchase agreements [Member]
Disclosure of financial assets held for trading [Line Items]
Loans and advances to central banks held for trading	1,074	620
Loans and advances to banks held for trading	31,633	17,954
Loans and advances to customers held for trading assets	31,307	28,639
Repurchase agreement [Member]
Disclosure of financial assets held for trading [Line Items]
Deposits from central banks held for trading	5,947	3,653
Deposits from credit institutions held for trading	21,093	17,652
Customer deposits held for trading	41,792	26,600
Issued by central banks [Member]
Disclosure of financial assets held for trading [Line Items]
Debt instruments held for trading	593	584
Issued by public administrations [Member]
Disclosure of financial assets held for trading [Line Items]
Debt instruments held for trading	31,789	27,222
Issued by financial institutions [Member]
Disclosure of financial assets held for trading [Line Items]
Debt instruments held for trading	1,940	1,411
Other debt instruments [Member]
Disclosure of financial assets held for trading [Line Items]
Debt instruments held for trading	€ 2,021	€ 1,628

Deposits from central banks held for trading

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Disclosure of financial instruments held for trading

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Loans and advances to central banks held for trading

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No definition available.

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- Definition

Short positions held for trading

+ References

No definition available.

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- Definition

The amount of current financial liabilities at fair value through profit or loss that meet the definition of held for trading. [Refer: Current financial liabilities at fair value through profit or loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2025-01-01
-Paragraph 8
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
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- Definition

The amount of instruments representing indebtedness held by the entity at fair value through profit or loss classified as held for trading. [Refer: Debt instruments held; Financial assets at fair value through profit or loss, classified as held for trading]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
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- Definition

The amount of deposit liabilities held by the entity at fair value through profit or loss that meet the definition of held for trading. [Refer: Financial liabilities at fair value through profit or loss that meet definition of held for trading]

+ References

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- Definition

The amount of deposit liabilities from banks held by the entity at fair value through profit or loss that meet the definition of held for trading. [Refer: Financial liabilities at fair value through profit or loss that meet definition of held for trading]

+ References

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- Definition

The amount of deposit liabilities from customers held by the entity at fair value through profit or loss that meet the definition of held for trading. [Refer: Financial liabilities at fair value through profit or loss that meet definition of held for trading]

+ References

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- Definition

The amount of derivative financial assets held for trading. [Refer: Derivative financial assets; Financial assets at fair value through profit or loss, classified as held for trading]

+ References

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- Definition

The amount of derivative financial liabilities held for trading. [Refer: Derivative financial liabilities; Financial liabilities at fair value through profit or loss that meet definition of held for trading]

+ References

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- Definition

The amount of instruments held by the entity that provide evidence of a residual interest in the assets of another entity after deducting all of its liabilities, classified as held for trading. [Refer: Equity instruments held; Financial assets at fair value through profit or loss, classified as held for trading]

+ References

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- Definition

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, mandatorily measured at fair value]

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- Definition

The amount of loans and advances the entity has made at fair value through profit or loss classified as held for trading. [Refer: Loans and advances; Financial assets at fair value through profit or loss, classified as held for trading]

+ References

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- Definition

The amount of loans and advances the entity has made to banks at fair value through profit or loss classified as held for trading. [Refer: Loans and advances to banks; Financial assets at fair value through profit or loss, classified as held for trading]

+ References

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- Definition

The amount of loans and advances the entity has made to customers at fair value through profit or loss classified as held for trading. [Refer: Loans and advances to customers; Financial assets at fair value through profit or loss, classified as held for trading]

+ References

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