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Basis of preparation and material accounting policy information - Additional information (Details) € in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 EUR (€) | Dec. 31, 2024 EUR (€) segment | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€)
Disclosure of material accounting policies [line items] |  |  |  |
Reconciliation net result effect of adjustment after tax EU IAS 39 carve-out |  | € (1,058) | € (3,147) | € 8,451
Number of reportable segments | segment |  | 5 |  |
Level of price index |  | 2,684.55 | 1,859.38 | 1,128.45
Price index movements |  | 0.4438 | 0.6477 | 0.6427
TLTRO |  |  |  |
Disclosure of material accounting policies [line items] |  |  |  |
Repayment of deposits from banks | € 6,000 |  |  |
Minimum | Property |  |  |  |
Disclosure of material accounting policies [line items] |  |  |  |
Useful life, property and equipment |  | 20 years |  |
Minimum | - Data processing equipment |  |  |  |
Disclosure of material accounting policies [line items] |  |  |  |
Useful life, property and equipment |  | 2 years |  |
Minimum | Fixtures and fittings |  |  |  |
Disclosure of material accounting policies [line items] |  |  |  |
Useful life, property and equipment |  | 4 years |  |
Maximum | Software and other intangible assets |  |  |  |
Disclosure of material accounting policies [line items] |  |  |  |
Useful life, intangible assets |  | 5 years |  |
Maximum | Property |  |  |  |
Disclosure of material accounting policies [line items] |  |  |  |
Useful life, property and equipment |  | 50 years |  |
Maximum | - Data processing equipment |  |  |  |
Disclosure of material accounting policies [line items] |  |  |  |
Useful life, property and equipment |  | 5 years |  |
Maximum | Fixtures and fittings |  |  |  |
Disclosure of material accounting policies [line items] |  |  |  |
Useful life, property and equipment |  | 10 years |  |

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- Definition The value of the level of the general price index used to restate financial statement information of an entity whose functional currency is the currency of a hyperinflationary economy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 29 -IssueDate 2024-01-01 -Paragraph 39 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=29&code=ifrs-tx-2024-en-r&anchor=para_39_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The movements in the general price index used to restate financial statement information of an entity whose functional currency is the currency of a hyperinflationary economy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 29 -IssueDate 2024-01-01 -Paragraph 39 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=29&code=ifrs-tx-2024-en-r&anchor=para_39_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The useful life, measured as period of time, used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 118 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The useful life, measured as period of time, used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_c&doctype=Standard -URIDate 2024-03-27 + Details
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