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Associates and Joint Ventures - Disclosure of Investments Accounted for Using Equity Method (Details) - EUR (€) € in Millions |  |  | 1 Months Ended | 7 Months Ended | 12 Months Ended
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Jul. 29, 2022 | Dec. 31, 2021 | Jul. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |
Investments in joint ventures accounted for using equity method |  | € 12,522 |  | € 12,522 | € 11,275 | € 12,522 |
Share of income (loss) of investments accounted for by the equity method |  |  |  |  | 230 | (132) | € (3)
Investments accounted for by the equity method |  | 251 |  | 251 | 312 | 251 |
Share of profit (loss) of associates accounted for using equity method |  |  |  |  | (13) | 5 | 5
Investments accounted for by the equity method |  | 12,773 |  | 12,773 | 11,587 | 12,773 |
Share of income (loss) of investments accounted for by the equity method |  |  |  |  | 217 | (127) | 2
Investments accounted for by the equity method |  |  |  |  |  |  |
Investments accounted for using equity method at beginning of period |  |  |  |  | 12,773 |  |
Additions |  |  |  |  |  | 73 |
Translation differences and other comprehensive income (loss) |  |  |  |  | 1,562 | 4,098 | (7,236)
Investments accounted for using equity method at ending of period |  | 12,773 |  | 12,773 | 11,587 | 12,773 |
Associates and Joint Ventures |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |
Investments accounted for by the equity method |  | 12,773 |  | 12,773 | 11,587 | 12,773 | 427
Investments accounted for by the equity method |  |  |  |  |  |  |
Investments accounted for using equity method at beginning of period |  |  |  |  | 12,773 | 427 |
Additions |  |  |  |  | 181 | 12,329 |
Disposals |  |  |  |  | (12) | (5) |
Translation differences and other comprehensive income (loss) |  |  |  |  | (646) | 350 |
(Loss) income |  |  |  |  | 217 | (127) |
Dividends |  |  |  |  | (920) | (198) |
Transfers and others |  |  |  |  | (6) | (3) |
Investments accounted for using equity method at ending of period |  | 12,773 |  | 12,773 | € 11,587 | 12,773 | 427
Daytona Midco SL. |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) |  |  |  |  | 20.00% |  |
Investments accounted for by the equity method |  | 81 |  | 81 | € 120 | 81 |
Share of profit (loss) of associates accounted for using equity method |  |  |  |  | € (1) | 0 | 0
Investments accounted for by the equity method |  |  |  |  |  |  |
Additions |  |  | € 81 |  |  |  |
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 |  | 4 |  | 4 | € 4 | 4 |
Share of profit (loss) of associates accounted for using equity method |  |  |  |  | € 0 | 0 | 0
InfraCo, SpA |  |  |  |  |  |  |
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 |  | 76 |  | 76 | € 79 | 76 |
Share of profit (loss) of associates accounted for using equity method |  |  |  |  | € 0 | (1) | 0
Alamo HoldCo S.L. |  |  |  |  |  |  |
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 |  | 0 |  | 0 | € 12 | 0 |
Share of profit (loss) of associates accounted for using equity method |  |  |  |  | € (15) | 0 | 0
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 |  | 52 |  | 52 | € 55 | 52 |
Share of profit (loss) of associates accounted for using equity method |  |  |  |  | € (3) | (5) | 0
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 |  | 7 |  | 7 | € 7 | 7 |
Share of profit (loss) of associates accounted for using equity method |  |  |  |  | € 4 | 3 | 3
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 |  | 3 |  | 3 | € 3 | 3 |
Share of profit (loss) of associates accounted for using equity method |  |  |  |  | € 3 | 3 | 2
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 | € 2 | 3 |
Share of profit (loss) of associates accounted for using 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 |  | 2 |  | 2 | € 1 | 2 |
Share of profit (loss) of associates accounted for using 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 |  | 1 |  | 1 | € 1 | 1 |
Share of profit (loss) of associates accounted for using 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 | € 1 | 1 |
Share of profit (loss) of associates accounted for using equity method |  |  |  |  | € 0 | 0 | 0
Telefonica 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 | € 0 | 0 |
Share of profit (loss) of associates accounted for using 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 |  | 19 |  | 19 | € 19 | 19 |
Share of profit (loss) of associates accounted for using equity method |  |  |  |  | € 2 | 2 | (1)
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 |  | 1 |  | 1 | € 2 | 1 |
Share of profit (loss) of associates accounted for using equity method |  |  |  |  | (3) | (1) | 0
Others |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |
Investments accounted for by the equity method |  | € 1 |  | € 1 | 6 | 1 |
Share of profit (loss) of associates accounted for using equity method |  |  |  |  | € (2) | € 2 | (1)
VMO2 |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in joint venture (as a percent) |  | 50.00% |  | 50.00% | 50.00% | 50.00% |
Investments in joint ventures accounted for using equity method |  | € 12,129 |  | € 12,129 | € 10,779 | € 12,129 |
Share of income (loss) of investments accounted for by the equity method |  |  |  | (103) | 292 | (103) | 0
Share of profit (loss) of associates accounted for using equity method |  |  |  | 0 | € 1 | 0 |
Investments accounted for by the equity method |  |  |  |  |  |  |
Additions |  |  |  |  |  | 12,012 |
Movistar Prosegur Alarmas |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in joint venture (as a percent) |  |  |  |  | 50.00% |  |
Investments in joint ventures accounted for using equity method |  | 263 |  | 263 | € 252 | 263 |
Share of income (loss) of investments accounted for by the equity method |  |  |  |  | € (12) | € (2) | (4)
FiBrasil Infraestructura e Fibra Ótica, S.A. |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in joint venture (as a percent) |  |  |  |  | 50.00% | 50.00% |
Investments in joint ventures accounted for using equity method |  | 68 |  | 68 | € 79 | € 68 |
Share of income (loss) of investments accounted for by the equity method |  |  |  |  | € (8) | (3) | 0
Unsere Grüne Glasfaser |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in joint venture (as a percent) |  |  |  |  | 50.00% |  |
Investments in joint ventures accounted for using equity method |  | 53 |  | 53 | € 108 | 53 |
Share of income (loss) of investments accounted for by the equity method |  |  |  |  | € (64) | (25) | (1)
Opal Jvco Limited (nexfibre) |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in joint venture (as a percent) | 50.00% |  |  |  | 25.00% |  |
Investments in joint ventures accounted for using equity method |  | 0 |  | 0 | € 55 | 0 |
Share of income (loss) of investments accounted for by the equity method |  |  |  |  | 26 | 0 | 0
Others |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |
Investments in joint ventures accounted for using equity method |  | € 9 |  | € 9 | 2 | 9 |
Share of income (loss) of investments accounted for by the equity method |  |  |  |  | € (4) | € 1 | € 2

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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 2022-03-24 -Paragraph 24 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2022-en-r&anchor=para_24_a&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_e&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2022-03-24 -Paragraph B16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2022-en-r&anchor=para_B16&doctype=Appendix&subtype=B -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 91 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_91_a&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_7&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2022-03-24 -Paragraph 28 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2022-en-r&anchor=para_28_e&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2022-03-24 -Paragraph 23 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2022-en-r&anchor=para_23_g&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective on first application of IFRS 9 -Name IFRS -Number 4 -IssueDate 2022-03-24 -Paragraph 39M -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2022-en-b&anchor=para_39M_b&doctype=Standard -URIDate 2022-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 82 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_82_c&doctype=Standard -URIDate 2022-03-24 + Details
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