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Basis of Presentation of the Consolidated Financial Statements - VMED O2 UK Joint Venture Narrative (Details) € in Millions, £ in Millions |  |  |  | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Jun. 01, 2021 | May 07, 2020 | Dec. 31, 2021 EUR (€) | Dec. 31, 2024 GBP (£) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 GBP (£) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 GBP (£) | Dec. 31, 2022 EUR (€)
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |
Share of (loss) income of investments accounted for by the equity method |  |  |  |  |  | € (14) |  | € (2,145) |  | € 230
Goodwill impairment (Note 7) |  |  |  |  |  | € 866 |  | 58 |  | 0
VMO2 |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture | 50.00% |  |  | 50.00% | 50.00% | 50.00% |  |  |  |
Dividends received from joint ventures, classified as investing activities |  |  |  |  | £ 425 | € 512 | £ 1,000 | 1,154 | £ 800 | 909
Share of (loss) income of investments accounted for by the equity method |  |  |  | € 292 |  | 89 |  | (2,030) |  | 292
Goodwill impairment (Note 7) |  |  |  | € 0 |  | € 0 | £ 3,107 | 3,572 |  | € 0
VMO2 | Telefónica, S.A. |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |
Goodwill impairment (Note 7) |  |  |  |  |  |  |  | € 1,786 |  |
VMO2 | Telefónica O2 Holdings Ltd. Holding company |  |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  | 50.00% | 50.00% |  |  |  |  |  |  |

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- Definition The cash inflow representing dividends received from joint ventures, classified as investing activities. [Refer: Total for all joint ventures [member]; Dividends received] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_16&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2024-01-01 -Paragraph B67 -Subparagraph d -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B67_d_v&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
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- Definition The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Total for all joint ventures [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2024-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2024-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_21_a_iv&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The entity's share of the profit (loss) of joint ventures accounted for using the equity method. [Refer: Investments accounted for using equity method; Total for all joint ventures [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_85&doctype=Standard -URIDate 2024-03-27 + Details
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