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Revenue and Expenses - Other Income Narrative (Details) € in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2024 EUR (€) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€)
Continuing And Discontinued Operations [Line Items] |  |  |  |
Other operating income | € 625 |  | € 428 | € 478
Gain on disposal of businesses | 47 |  | 24 | 205
Capital gains arising from sale and leaseback transactions | 17 |  | 105 | € 381
Colombia Telecomunicaciones S.A. ESP BIC And Colombia Móvil S.A. ESP |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |
Gain on disposal of businesses | 47 |  |  |
Opal Jvco Limited (nexfibre) |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |
Capital gain (loss) |  |  | 20 |
Republic of Colombia |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |
Other operating income | € 358 | $ 380 |  |
Telefonica Colombia | KKR Alameda Aggregator L.P. | Alamo HoldCo S.L. (Onnet Fibra Colombia) |  |  |  |
Continuing And Discontinued Operations [Line Items] |  |  |  |
Gains (losses) on disposals of property, plant and equipment |  |  | € 162 |

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- Definition The gains (losses) arising from sale and leaseback transactions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The gains (losses) on disposals of property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 98 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_98_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The gain on the disposal of investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 98 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_98_d&doctype=Standard -URIDate 2024-03-27 + Details
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