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Financial Assets and Other Non-current Assets - Breakdown of Assets (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of financial assets [line items] |  |  |
Non-current financial assets | € 5,339 | € 5,201 |
Other non-current assets | 2,064 | 2,067 |
Contractual assets (Note 23) | 288 | 325 |
Deferred expenses (Note 23) | 1,073 | 1,001 |
Long-term receivables for taxes | 315 | 354 |
Prepayments | 388 | 387 |
Total | 7,403 | 7,268 |
Investments |  |  |
Disclosure of financial assets [line items] |  |  |
Non-current financial assets | 585 | 616 | € 497
Credits and other financial assets |  |  |
Disclosure of financial assets [line items] |  |  |
Non-current financial assets | 602 | 741 | 981
Deposits and guarantees |  |  |
Disclosure of financial assets [line items] |  |  |
Non-current financial assets | 691 | 966 | 1,163
Trade receivables |  |  |
Disclosure of financial assets [line items] |  |  |
Non-current financial assets | 945 | 1,049 | 1,019
Trade receivables | Impairment losses |  |  |
Disclosure of financial assets [line items] |  |  |
Non-current financial assets | (106) | (125) | (128)
Receivables for subleases |  |  |
Disclosure of financial assets [line items] |  |  |
Non-current financial assets | 17 | 14 | € 19
Long-term derivative financial assets (Note 19) |  |  |
Disclosure of financial assets [line items] |  |  |
Non-current financial assets | € 2,605 | € 1,940 |

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