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Associates and Joint Ventures - Narrative (Details) € in Millions, £ in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 08, 2024 | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 GBP (£) | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 GBP (£) | Dec. 31, 2023 CLP ($) | Dec. 31, 2022 EUR (€) | Dec. 31, 2022 GBP (£)
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |  |
Gains (losses) on remeasurements of defined benefit plans |  | € 91 |  | € (31) |  |  | € 70 |
VMO2 |  |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |  |
Dividends received from joint ventures, classified as investing activities |  | 512 | £ 425 | 1,154 | £ 1,000 |  | € 909 | £ 800
Nabiax |  |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |  |
Dividends received from joint ventures, classified as investing activities |  |  |  | € 54 |  |  |  |
Transfers and others |  | € 58 |  |  |  |  |  |
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% | 20.00% |  |  |  |  |
Telefónica Chile, S.A. | HoldCo infraCo SpA |  |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) |  |  |  | 40.00% | 40.00% | 40.00% |  |
Unsere Grüne Glasfaser (UGG) |  |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |  |
Additions |  | € 91 |  | € 73 |  |  |  |
Unsere Grüne Glasfaser (UGG) | Derivative instruments |  |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |  |
Gains (losses) on exchange differences on translation of foreign operations, net of tax |  | 7 |  | (30) |  |  |  |
Nexfibre |  |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |  |
Additions |  | 38 |  | 33 |  |  |  |
HoldCo infraCo SpA | Telefónica Chile, S.A. |  |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |  |
Additions |  |  |  | 73 |  | $ 70,960 |  |
VMO2 |  |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |  |
Gains (losses) on exchange differences on translation of foreign operations, net of tax |  | (380) |  | (219) |  |  |  |
Gains (losses) on remeasurements of defined benefit plans |  | € 101 |  | € 41 |  |  |  |
Nabiax | Asterion Industrial Partners SGEIC | Aermont Group |  |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |  |
Percentage of share capital sold | 80.00% |  |  |  |  |  |  |

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- Definition The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [domain]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in 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 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_135_b&doctype=Standard -URIDate 2024-03-27 + Details
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