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Intangible Assets - Gross Cost, Accumulated Amortization and Impairment Losses of Intangible Assets (Details) - EUR (€) € in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | € 12,017 | € 11,725 | € 11,488
Gross cost |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 40,550 | 37,211 |
Accumulated amortization |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (28,345) | (25,355) |
Impairment losses |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (188) | (131) |
Service concession arrangements and licenses |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 7,550 | 7,328 | 6,573
Service concession arrangements and licenses | Gross cost |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 15,837 | 14,456 |
Service concession arrangements and licenses | Accumulated amortization |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (8,123) | (7,007) |
Service concession arrangements and licenses | Impairment losses |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (164) | (121) |
Software |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 2,800 | 2,494 | 2,380
Software | Gross cost |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 17,158 | 15,442 |
Software | Accumulated amortization |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (14,344) | (12,938) |
Software | Impairment losses |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (14) | (10) |
Customer base |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 721 | 971 | 1,238
Customer base | Gross cost |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 5,089 | 4,888 |
Customer base | Accumulated amortization |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (4,368) | (3,917) |
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 | 263 | 276 | 512
Trademarks | Gross cost |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 944 | 901 |
Trademarks | Accumulated amortization |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (681) | (625) |
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 | 39 | 42 | 51
Other intangible assets | Gross cost |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 870 | 910 |
Other intangible assets | Accumulated amortization |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (829) | (868) |
Other intangible assets | Impairment losses |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | (2) | 0 |
Intangible assets in process |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 644 | 614 | € 734
Intangible assets in process | Gross cost |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |
Intangible assets | 652 | 614 |
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 | € (8) | € 0 |

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