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Fair value of financial instruments - Schedule of fair values of financial assets and liabilities (Details) - EUR (€) € in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Financial assets held for trading | € 252,318 | € 230,253 | € 176,921
Non-trading financial assets mandatorily at fair value through profit or loss | 7,761 | 6,130 | 5,910
Financial assets designated at fair value through profit or loss | 8,046 | 7,915 | 9,773
Financial assets at fair value through other comprehensive income | 74,612 | 89,898 | 83,308
Hedging derivatives (assets) | 3,931 | 5,672 | 5,297
Financial liabilities held for trading | 171,546 | 152,151 | 122,270
Financial liabilities designated at fair value through profit or loss | 42,148 | 36,360 | 40,367
Hedging derivatives (liabilities) | 4,248 | 4,752 | 7,656
Liabilities under insurance contracts | 18,737 | 17,829 | 17,799
Level 1 |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Financial assets held for trading | 106,560 | 88,147 | 67,842
Non-trading financial assets mandatorily at fair value through profit or loss | 2,407 | 2,037 | 1,765
Financial assets designated at fair value through profit or loss | 2,860 | 2,744 | 2,746
Financial assets at fair value through other comprehensive income | 52,589 | 67,680 | 64,631
Financial liabilities held for trading | 37,192 | 29,974 | 20,298
Financial liabilities designated at fair value through profit or loss | 0 | 0 | 25
Internal Models (level 2 and 3) |  |  |
Measurement of financial assets and liabilities and recognition of fair value changes |  |  |
Financial assets held for trading | 145,758 | 142,106 | 109,079
Non-trading financial assets mandatorily at fair value through profit or loss | 5,354 | 4,093 | 4,145
Financial assets designated at fair value through profit or loss | 5,186 | 5,171 | 7,027
Financial assets at fair value through other comprehensive income | 22,023 | 22,218 | 18,677
Hedging derivatives (assets) | 3,931 | 5,672 | 5,297
Financial liabilities held for trading | 134,354 | 122,177 | 101,972
Financial liabilities designated at fair value through profit or loss | 42,148 | 36,360 | 40,342
Hedging derivatives (liabilities) | 4,248 | 4,752 | 7,656
Liabilities under insurance contracts | € 18,737 | € 17,829 | € 17,799

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- Definition The amount of derivative financial assets held for hedging. [Refer: Derivative financial assets] + 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 + Details
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- Definition The amount of derivative financial liabilities held for hedging. [Refer: Derivative financial liabilities] + 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 + Details
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- Definition The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 8 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_8_h&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 e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_44_e&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 e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_44_e&doctype=Standard -URIDate 2025-03-27 + Details
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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] + 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 + 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 + Details
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- Definition The amount of financial liabilities at fair value through profit or loss that meet the definition of held for trading. A financial liability is classified as held for trading if: (a) it is acquired or incurred principally for the purpose of selling or repurchasing 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: 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 ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_44_b_ii&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 ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_44_b_ii&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of insurance contracts issued that are liabilities. [Refer: Liabilities; Insurance contracts issued [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2025-01-01 -Paragraph 78 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_78_b&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 54 -Subparagraph ma -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_ma&doctype=Standard -URIDate 2025-03-27 + Details
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