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Derivatives and hedge accounting - Hedged items included in a fair value hedging relationship (Details) - - fair value hedges - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about hedged items [line items] |  |  |
Change in fair value hedging instruments for the period | € 1,606 | € (5,928) | € (1,317)
Interest rate risk | Derivatives |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Hedged item, assets | 40,394 | 24,794 |
Hedged item, liabilities | 84,967 | 76,199 |
Accumulated fair value hedge adjustment remaining in statement of financial position for hedged item that ceased to be adjusted for hedging gains and losses, assets | 91 | 261 |
Accumulated fair value hedge adjustment remaining in statement of financial position for hedged item that ceased to be adjusted for hedging gains and losses, liabilities | (4) | (2) |
Change in fair value of the hedged item for measuring ineffectiveness for the period | (1,679) | 5,563 |
Change in fair value hedging instruments for the period | 1,606 | (5,928) |
Hedge ineffectiveness recognised in the statement of profit or loss gain (+) / loss (-) | (73) | (365) |
Carrying amount net investment hedge reserve at the end of the reporting period | (113) | (208) |
Accumulated fair value hedge adjustment on hedged item included in carrying amount, liabilities | (4,221) | (7,468) |
Debt securities | Interest rate risk | Derivatives |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Hedged item, liabilities | 70,280 | 61,449 |
Accumulated fair value hedge adjustment remaining in statement of financial position for hedged item that ceased to be adjusted for hedging gains and losses, liabilities | (3,383) | (6,122) |
Change in fair value of the hedged item for measuring ineffectiveness for the period | (2,680) | 7,658 |
Debt securities | Financial assets at FVOCI | Interest rate risk | Derivatives |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Hedged item, assets | 31,224 | 19,816 |
Change in fair value of the hedged item for measuring ineffectiveness for the period | 1,224 | (2,798) |
Debt securities | Financial assets at amortised cost | Interest rate risk | Derivatives |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Hedged item, assets | 8,272 | 4,098 |
Accumulated fair value hedge adjustment remaining in statement of financial position for hedged item that ceased to be adjusted for hedging gains and losses, assets | (205) | (448) |
Change in fair value of the hedged item for measuring ineffectiveness for the period | 234 | (678) |
– Loans and advances to customers | Interest rate risk | Derivatives |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Hedged item, assets | 898 | 879 |
Accumulated fair value hedge adjustment remaining in statement of financial position for hedged item that ceased to be adjusted for hedging gains and losses, assets |  | (20) |
Change in fair value of the hedged item for measuring ineffectiveness for the period | 15 | (90) |
– Subordinated loans | Interest rate risk | Derivatives |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Hedged item, liabilities | 14,643 | 14,750 |
Accumulated fair value hedge adjustment remaining in statement of financial position for hedged item that ceased to be adjusted for hedging gains and losses, liabilities | (834) | (1,344) |
Change in fair value of the hedged item for measuring ineffectiveness for the period | (473) | 1,470 |
– Customer deposits and other funds on deposit | Interest rate risk | Derivatives |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Hedged item, liabilities | 44 |  |
Accumulated fair value hedge adjustment remaining in statement of financial position for hedged item that ceased to be adjusted for hedging gains and losses, liabilities | € (1) |  |
Change in fair value of the hedged item for measuring ineffectiveness for the period |  | € 2 |

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- Definition The accumulated amount of fair value hedge adjustment on a hedged item that is included in the carrying amount of the hedged item, recognised in the statement of financial position as an asset. [Refer: Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24B -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24B_a_ii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The accumulated amount of fair value hedge adjustment on a hedged item that is included in the carrying amount of the hedged item, recognised in the statement of financial position as a liability. [Refer: Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24B -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24B_a_ii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The accumulated amount of fair value hedge adjustment remaining in the statement of financial position for a hedged item that is a financial asset measured at amortised cost and has ceased to be adjusted for hedging gains and losses. [Refer: Financial assets at amortised cost; Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24B -Subparagraph a -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24B_a_v&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The accumulated amount of fair value hedge adjustment remaining in the statement of financial position for a hedged item that is a financial liability measured at amortised cost and has ceased to be adjusted for hedging gains and losses. [Refer: Financial liabilities at amortised cost; Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24B -Subparagraph a -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24B_a_v&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24C_b_ii&doctype=Standard -URIDate 2023-03-23 + Details
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