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Associates and Joint Ventures - Disclosure of Investments Accounted for Using Equity Method (Details) - EUR (€) € in Millions |  |  | 7 Months Ended | 12 Months Ended
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Nov. 08, 2024 | Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Investments accounted for by the equity method |  |  |  | € 8,143 | € 8,265 |
Share of (loss) income of investments accounted for by the equity method |  |  |  | (14) | (2,145) | € 230
Investments accounted for by the equity method |  |  |  | 232 | 325 |
Share of income of investments accounted for by the equity method |  |  |  | (35) | (17) | (13)
Investments accounted for by the equity method |  |  |  | 8,375 | 8,590 |
Share of (loss) income of investments accounted for by the equity method |  |  |  | (49) | (2,162) | 217
Investments accounted for by the equity method |  |  |  |  |  |
Investments accounted for using equity method at beginning of period |  |  |  | 8,590 |  |
Translation differences and other comprehensive income (loss) |  |  |  | (1,465) | 270 | 1,562
Investments accounted for using equity method at ending of period |  |  |  | 8,375 | 8,590 |
Associates and Joint Ventures |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Investments accounted for by the equity method |  |  |  | 8,375 | 8,590 | 11,587
Investments accounted for by the equity method |  |  |  |  |  |
Investments accounted for using equity method at beginning of period |  |  |  | 8,590 | 11,587 |
Additions |  |  |  | 160 | 236 |
Translation differences and other comprehensive income (loss) |  |  |  | 249 | 144 |
(Loss) income |  |  |  | (49) | (2,162) |
Dividends |  |  |  | (520) | (1,218) |
Transfers and others |  |  |  | (55) | 3 |
Investments accounted for using equity method at ending of period |  |  |  | € 8,375 | 8,590 | 11,587
Daytona Midco, S.L. (Nabiax) |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) | 20.00% |  |  | 20.00% |  |
Investments accounted for by the equity method |  |  |  | € 0 | 65 |
Share of income of investments accounted for by the equity method |  |  |  | € (7) | (1) | (1)
Adquira España, S.A. |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) |  |  |  | 44.44% |  |
Investments accounted for by the equity method |  |  |  | € 5 | 4 |
Share of income of investments accounted for by the equity method |  |  |  | € 0 | € 0 | 0
HoldCo Infraco SpA. (Onnet Fibra Chile) |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  | 40.00% | 40.00% |
Proportion of ownership interest in associate (as a percent) |  |  |  | 40.00% |  |
Investments accounted for by the equity method |  |  |  | € 119 | € 150 |
Share of income of investments accounted for by the equity method |  |  |  | € (24) | 7 | 0
Alamo HoldCo S.L. (Onnet Fibra Colombia) |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) |  |  |  | 40.00% |  |
Investments accounted for by the equity method |  |  |  | € 11 | 14 |
Share of income of investments accounted for by the equity method |  |  |  | € (17) | (10) | (15)
Internet para todos S.A.C |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) |  |  |  | 54.67% |  |
Investments accounted for by the equity method |  |  |  | € 57 | 55 |
Share of income of investments accounted for by the equity method |  |  |  | € 0 | 0 | (3)
Telefónica Factoring España, S.A. |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) |  |  |  | 50.00% |  |
Investments accounted for by the equity method |  |  |  | € 8 | 7 |
Share of income of investments accounted for by the equity method |  |  |  | € 4 | 4 | 4
Telefónica Factoring do Brasil, Ltda. |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) |  |  |  | 50.00% |  |
Investments accounted for by the equity method |  |  |  | € 2 | 2 |
Share of income of investments accounted for by the equity method |  |  |  | € 2 | 1 | 3
Telefónica Factoring Peru, S.A.C. |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) |  |  |  | 50.00% |  |
Investments accounted for by the equity method |  |  |  | € 3 | 3 |
Share of income of investments accounted for by the equity method |  |  |  | € 1 | 1 | 1
Telefónica Factoring Colombia, S.A. |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) |  |  |  | 50.00% |  |
Investments accounted for by the equity method |  |  |  | € 1 | 1 |
Share of income of investments accounted for by the equity method |  |  |  | € 1 | 1 | 1
Telefónica Factoring México,S.A. de C.V. |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) |  |  |  | 50.00% |  |
Investments accounted for by the equity method |  |  |  | € 0 | 1 |
Share of income of investments accounted for by the equity method |  |  |  | € 0 | 0 | 0
Telefónica Factoring Chile, SpA. |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) |  |  |  | 50.00% |  |
Investments accounted for by the equity method |  |  |  | € 1 | 1 |
Share of income of investments accounted for by the equity method |  |  |  | € 0 | 0 | 0
Telefónica Factoring Ecuador, S.A. |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) |  |  |  | 50.00% |  |
Investments accounted for by the equity method |  |  |  | € 0 | 0 |
Share of income of investments accounted for by the equity method |  |  |  | € 0 | 0 | 0
Telefónica Consumer Finance, Establecimiento Financiero de Crédito, S.A. |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) |  |  |  | 50.00% |  |
Investments accounted for by the equity method |  |  |  | € 14 | 18 |
Share of income of investments accounted for by the equity method |  |  |  | € 1 | 1 | 2
Telefónica Renting, S.A. |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) |  |  |  | 50.00% |  |
Investments accounted for by the equity method |  |  |  | € 9 | 1 |
Share of income of investments accounted for by the equity method |  |  |  | € 4 | 0 | 0
Movistar Consumer Finance Colombia SAS. |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) |  |  |  | 50.00% |  |
Investments accounted for by the equity method |  |  |  | € 0 | 0 |
Share of income of investments accounted for by the equity method |  |  |  | 0 | (21) | (3)
Others |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Investments accounted for by the equity method |  |  |  | 2 | 3 |
Share of income of investments accounted for by the equity method |  |  |  | € 0 | 0 | (2)
VMO2 |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in joint venture |  | 50.00% | 50.00% | 50.00% |  |
Investments accounted for by the equity method |  |  |  | € 7,641 | 7,774 |
Share of (loss) income of investments accounted for by the equity method |  |  | € 292 | 89 | (2,030) | 292
Share of income of investments accounted for by the equity method |  |  | € 1 | € 4 | € 2 | 1
Movistar Prosegur Alarmas |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  | 50.00% | 50.00% |
Investments accounted for by the equity method |  |  |  | € 213 | € 230 |
Share of (loss) income of investments accounted for by the equity method |  |  |  | (16) | (22) | (12)
Investments accounted for by the equity method |  |  |  | € 213 | 230 |
FiBrasil Infraestructura e Fibra Ótica, S.A. |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  | 50.00% |  |
Investments accounted for by the equity method |  |  |  | € 80 | 100 |
Share of (loss) income of investments accounted for by the equity method |  |  |  | € (1) | € (4) | (8)
Unsere Grüne Glasfaser (UGG) |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  | 50.00% | 50.00% |
Investments accounted for by the equity method |  |  |  | € 104 | € 97 |
Share of (loss) income of investments accounted for by the equity method |  |  |  | (77) | (55) | (64)
Investments accounted for by the equity method |  |  |  | € 104 | € 97 |
Opal Jvco Limited (nexfibre) |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  | 25.00% | 25.00% |
Investments accounted for by the equity method |  |  |  | € 94 | € 55 |
Share of (loss) income of investments accounted for by the equity method |  |  |  | (2) | (32) | 26
Investments accounted for by the equity method |  |  |  | € 94 | 55 |
Utiq, S.A. |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  |  | 25.00% |  |
Investments accounted for by the equity method |  |  |  | € 3 | 5 |
Share of (loss) income of investments accounted for by the equity method |  |  |  | (4) | 0 | 0
Others |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |
Investments accounted for by the equity method |  |  |  | 8 | 4 |
Share of (loss) income of investments accounted for by the equity method |  |  |  | € (3) | € (2) | € (4)

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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 24 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_24_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B16&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of other comprehensive income, net of tax, after reclassification adjustments, related to exchange differences when financial statements of foreign operations are translated. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 91 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_91_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_7&doctype=Standard -URIDate 2024-03-27 + Details
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