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Basis of Presentation of the Consolidated Financial Statements - Public Offer for the Acquisition of Telefonica Shares Telefonica Deutschland (Details) - EUR (€) € / shares in Units, € in Millions |  |  |  |  |  |  | 2 Months Ended | 12 Months Ended
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Apr. 18, 2024 | Jan. 26, 2024 | Dec. 31, 2023 | Nov. 07, 2023 | Mar. 24, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities |  |  |  |  |  |  |  | € 189 | € 252 | € 1,628
Equity attributable to owners of parent |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) through disposal of subsidiary, equity |  |  |  |  | € (46) |  |  |  |  |
Non-controlling interests |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) through disposal of subsidiary, equity |  |  |  |  | € (585) |  |  |  |  |
Telefónica Deutschland Holding A.G. |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest available in offer |  |  |  | 28.19% |  |  |  |  |  |
Telefónica Deutschland Holding A.G. |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest (as a percent) | 96.85% | 94.12% | 82.43% | 71.81% |  | 70.58% |  |  |  |
Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities |  |  |  |  |  |  | € 816 |  |  |
Tender offer of equity instrument (in eur per share) | € 2.35 |  |  |  |  |  |  |  |  |
Telefónica Deutschland Holding A.G. | Equity attributable to owners of parent |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) through disposal of subsidiary, equity |  |  |  |  |  |  |  | 28 | 46 |
Telefónica Deutschland Holding A.G. | Non-controlling interests |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) through disposal of subsidiary, equity |  |  |  |  |  |  |  | € (1,057) | € (866) |

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- Definition The aggregate cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities. [Refer: Total for all subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 39 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_39&doctype=Standard -URIDate 2024-03-27 + Details
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