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Intangible Assets - Gross Cost, Accumulated Amortization and Impairment Losses of Intangible Assets (Details) - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | € 9,875 | € 11,370 | € 12,017
Cost |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 38,126 | 40,622 |
Accumulated amortization |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (27,524) | (29,122) |
Impairment losses |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (727) | (130) |
Service concession arrangements and licenses |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 5,667 | 6,886 | 7,550
Service concession arrangements and licenses | Cost |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 15,018 | 16,056 |
Service concession arrangements and licenses | Accumulated amortization |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (8,666) | (9,061) |
Service concession arrangements and licenses | Impairment losses |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (685) | (109) |
Software |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 3,104 | 3,089 | 2,800
Software | Cost |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 18,442 | 17,851 |
Software | Accumulated amortization |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (15,300) | (14,753) |
Software | Impairment losses |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (38) | (9) |
Customer base |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 151 | 386 | 721
Customer base | Cost |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 2,265 | 4,166 |
Customer base | Accumulated amortization |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (2,114) | (3,780) |
Customer base | Impairment losses |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 0 | 0 |
Trademarks |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 187 | 235 | 263
Trademarks | Cost |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 905 | 958 |
Trademarks | Accumulated amortization |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (718) | (723) |
Trademarks | Impairment losses |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 0 | 0 |
Other intangible assets |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 64 | 58 | 39
Other intangible assets | Cost |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 794 | 867 |
Other intangible assets | Accumulated amortization |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (726) | (805) |
Other intangible assets | Impairment losses |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (4) | (4) |
Intangible assets in process |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 702 | 716 | € 644
Intangible assets in process | Cost |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 702 | 724 |
Intangible assets in process | Accumulated amortization |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 0 | 0 |
Intangible assets in process | Impairment losses |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | € 0 | € (8) |

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