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Associates and Joint Ventures - VMED O2 UK Narrative (Details) € in Millions, £ in Millions |  | 7 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2021 EUR (€) | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 GBP (£) | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 GBP (£) | Dec. 31, 2022 EUR (€) | Dec. 31, 2024 GBP (£)
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |  |
Goodwill impairment |  |  | € 866 |  | € 58 |  | € 0 |
Valuation assumption, discount rate (in percentage) |  |  | 7.70% | 7.70% | 7.50% | 7.50% |  |
Valuation assumption, perpetuity growth rate (in percentage) |  |  | 1.00% | 1.00% |  |  |  |
Period covering projected cash flows for calculation of impairment |  |  | 5 years | 5 years |  |  |  |
Valuation assumption, weighted average cost of capital, increase (decrease) |  |  | 0.50% |  |  |  |  | 0.50%
Valuation assumption, weighted average cost of capital, impairment of goodwill |  |  | € 2,050 | £ 1,700 |  |  |  |
Valuation assumption, perpetuity growth rate, increase (decrease) |  |  | 0.25% |  |  |  |  | 0.25%
Valuation assumption, increase (decrease) in EBITDA margin |  |  | 1.00% |  |  |  |  | 1.00%
Valuation assumption, increase (decrease) in long term investment ratio |  |  | 0.50% |  |  |  |  | 0.50%
Investments accounted for by the equity method |  |  | € 8,143 |  | € 8,265 |  |  |
VMO2 |  |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |  |
Goodwill impairment |  | € 0 | € 0 |  | 3,572 | £ 3,107 | € 0 |
Proportion of ownership interest in joint venture | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  |
Period covering projected cash flows for calculation of impairment |  |  | 10 years | 10 years |  |  |  |
Amount by which unit's recoverable amount exceeds its carrying amount |  |  | € 965 |  |  |  |  | £ 800
Investments accounted for by the equity method |  |  | € 7,641 |  | 7,774 |  |  |
VMO2 | Telefónica, S.A. |  |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  | € 1,786 |  |  |
Forecast | Minimum |  |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |  |
Valuation assumption, EBITDA margin (in percentage) |  |  | 32.00% | 32.00% |  |  |  |
Valuation assumption, long-term capital expenditure ratio (in percentage) |  |  | 12.00% | 12.00% |  |  |  |
Forecast | Maximum |  |  |  |  |  |  |  |
Disclosure Of Joint Ventures And Associates [Line Items] |  |  |  |  |  |  |  |
Valuation assumption, EBITDA margin (in percentage) |  |  | 41.00% | 41.00% |  |  |  |
Valuation assumption, long-term capital expenditure ratio (in percentage) |  |  | 15.00% | 15.00% |  |  |  |

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- Definition The amount by which a cash-generating unit's (group of units') recoverable amount exceeds its carrying amount. [Refer: Carrying amount [member]; Total for all cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 134 -Subparagraph f -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_134_f_i&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 135 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_135_e_i&doctype=Standard -URIDate 2024-03-27 + Details
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