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Debt, cash and cash equivalents and lease liabilities - Summary of Changes in Financial Position (Details) - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Financial Instruments [Abstract] |  |  |  |
Long-term debt | € 14,347 | € 14,857 | € 17,123 |
Short-term debt and current portion of long-term debt | 2,045 | 4,174 | 3,183 |
Interest rate and currency derivatives used to manage debt | 139 | 187 | (56) |
Total debt | 16,531 | 19,218 | 20,250 | € 22,631
Cash and cash equivalents | (8,710) | (12,736) | (10,098) | € (13,915)
Interest rate and currency derivatives used to manage cash and cash equivalents | (28) | (45) | (169) |
Net debt | 7,793 | 6,437 | 9,983 |
Lease liabilities | € 2,030 | € 2,181 | € 2,108 |

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_b&doctype=Standard -URIDate 2023-03-23 + Details
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