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Segment Information - Income, Capital Expenditure and Acquisitions of Rights of Use of VMO2 (Details) € in Millions, £ in Millions |  | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2021 EUR (€) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 GBP (£) | Dec. 31, 2022 EUR (€)
Disclosure of joint ventures [line items] |  |  |  |  |  |
Revenues |  |  | € 41,315 | € 40,652 |  | € 39,993
Other operating income and expenses |  |  | 625 | 428 |  | 478
Impairment losses in goodwill |  |  | (866) | (58) |  | 0
Depreciation and amortization |  |  | (8,799) | (8,797) |  | (8,796)
OPERATING INCOME |  |  | 2,395 | 2,593 |  | 4,056
Share of income of investments accounted for by the equity method |  |  | (35) | (17) |  | (13)
Finance income |  |  | 980 | 1,099 |  | 1,803
Financial expenses |  |  | (2,998) | (3,014) |  | (3,030)
Foreign currency transaction losses, net |  |  | 113 | 124 |  |
Net financial result |  |  | (1,789) | (1,904) |  | (1,313)
PROFIT (LOSS) BEFORE TAX |  |  | 557 | (1,473) |  | 2,960
Corporate income tax |  |  | (348) | 899 |  | (641)
PROFIT (LOSS) FOR THE YEAR |  |  | 209 | (574) |  | 2,319
Attributable to non-controlling interests |  |  | 258 | 318 |  | 308
Attributable to equity holders of the parent |  |  | (49) | (892) |  | 2,011
Share of (loss) income of investments accounted for by the equity method |  |  | (14) | (2,145) |  | 230
Acquisitions of rights of use |  |  | 2,142 | 2,391 |  |
VMO2 |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Revenues |  | € 12,155 | 12,616 | 12,547 |  | 12,155
Other operating income and expenses |  | (7,754) | (8,149) | (8,116) |  |
Impairment losses in goodwill |  | 0 | 0 | (3,572) | £ (3,107) | 0
Operating results before depreciation and amortization |  | 4,401 | 4,467 | 859 |  |
Depreciation and amortization |  | (4,170) | (3,371) | (3,685) |  | (4,170)
OPERATING INCOME |  | 231 | 1,096 | (2,826) |  | 231
Share of income of investments accounted for by the equity method |  | 1 | 4 | 2 |  | 1
Finance income |  | 24 | 51 | 55 |  | 24
Financial expenses |  | (1,020) | (1,578) | (1,436) |  | (1,020)
Realised and unrealised gains on derivative instruments, net |  | 2,567 | 463 | (924) |  | 2,567
Foreign currency transaction losses, net |  | (1,296) | (34) | 677 |  | (1,296)
Net financial result |  | 275 | (1,098) | (1,628) |  | 275
PROFIT (LOSS) BEFORE TAX |  | 507 | 2 | (4,452) |  | 507
Corporate income tax |  | (15) | (22) | 265 |  | (15)
PROFIT (LOSS) FOR THE YEAR |  | 492 | (20) | (4,187) |  | 492
Attributable to non-controlling interests |  | 0 | (19) | 0 |  | 0
Attributable to equity holders of the parent |  | 492 | (39) | (4,187) |  | 492
50% attributable to Telefónica Group |  | 246 | (20) | (2,094) |  | 246
Share-based compensation |  | 14 | 1 | 8 |  | 14
Sale of minority stake in Cornerstone |  | 0 | 112 | 76 |  | 0
Other adjustments |  | 32 | (5) | (20) |  | 32
Share of (loss) income of investments accounted for by the equity method |  | 292 | 89 | (2,030) |  | € 292
CapEx |  | 2,707 | 2,580 | 2,408 |  |
Acquisitions of rights of use |  | € 118 | € 539 | € 135 |  |
Result for the period of joint venture (in percent) |  |  | 100.00% |  |  |
Proportion of ownership interest in joint venture | 50.00% | 50.00% | 50.00% |  |  |

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