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Off balance sheet commitments - Summary of Undrawn Credit Facilities (Details) - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure Of Line of Credit Facility [Line Items] |  |  |
General-purpose credit facilities | € 8,000 | € 8,000 | € 8,000
Less than 1 year |  |  |
Disclosure Of Line of Credit Facility [Line Items] |  |  |
General-purpose credit facilities | 0 |  |
From 1 to 3 years |  |  |
Disclosure Of Line of Credit Facility [Line Items] |  |  |
General-purpose credit facilities | 0 |  |
From 3 to 5 years |  |  |
Disclosure Of Line of Credit Facility [Line Items] |  |  |
General-purpose credit facilities | 4,000 |  |
More than 5 years |  |  |
Disclosure Of Line of Credit Facility [Line Items] |  |  |
General-purpose credit facilities | € 4,000 |  |

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- Definition The amount of undrawn borrowing facilities that may be available for future operating activities and to settle capital commitments. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 50 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_50_a&doctype=Standard -URIDate 2023-03-23 + Details
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