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Basis of Presentation of the Consolidated Financial Statements - Agreement Between Telxius Telecom and American Tower Corporation for the Sale of its Telecommunications Towers Divisions in Europe and Latin America (Details) € in Millions | Aug. 02, 2021 EUR (€) site | Jun. 03, 2021 EUR (€) | Jun. 01, 2021 EUR (€) | Jan. 13, 2021 site transaction | Jun. 08, 2020 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€) | Dec. 31, 2020 EUR (€)
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Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Right-of-use assets |  |  |  |  |  | € 8,279 | € 7,579 | € 4,982
Lease liabilities |  |  |  |  |  | € 8,677 | € 8,070 | € 5,294
Telxius Telecom, S.A. |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Number of telecommunication tower sites sold | site |  |  |  | 30,722 |  |  |  |
Number of separate and independent transactions | transaction |  |  |  | 2 |  |  |  |
Europe towers division | Telxius Telecom, S.A. |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Cash received |  |  | € 6,346 |  |  |  |  |
Latin America towers division | Telxius Telecom, S.A. |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Cash received |  | € 887 |  |  |  |  |  |
Europe Towers Division, Second Phase | Telxius Telecom, S.A. |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Number of telecommunication tower sites sold | site | 4,080 |  |  |  |  |  |  |
Cash received |  |  |  |  | € 632 |  |  |
Europe and Latin America towers division | Telxius Telecom, S.A. |  |  |  |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |  |  |  |
Right-of-use assets | € 2,633 |  |  |  |  |  |  |
Lease liabilities | € 2,775 |  |  |  |  |  |  |

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