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Basis of Presentation of the Consolidated Financial Statements - Valuation of noncurrent assets of Telefonica Argentina Narrative (Details) € in Millions | 12 Months Ended
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Dec. 31, 2024 EUR (€) $ / € | Dec. 31, 2023 EUR (€) $ / € | Dec. 31, 2022 EUR (€) $ / €
Currency [Line Items] |  |  |
Inflation adjustments | € (409) | € (223) |
Inflation adjust-ments | (912) | (693) |
Deferred tax assets | 6,673 | 6,240 | € 4,884
Revenues | 41,315 | € 40,652 | € 39,993
Argentine peso |  |  |
Currency [Line Items] |  |  |
Increase (decrease) in equity due to depreciation of euro to major currencies | € (899) |  |
Variation of closing exchange rate (in percentage) | 16.70% | 78.80% |
Increase intangible and fixed assets | € 1,279 |  |
Brazilian real |  |  |
Currency [Line Items] |  |  |
Increase (decrease) in equity due to depreciation of euro to major currencies | € 2,174 | € (419) |
Variation of closing exchange rate (in percentage) | 16.90% | (4.10%) |
Argentina |  |  |
Currency [Line Items] |  |  |
Annual index rate (as a percent) | 117.80% | 211.40% | 95.00%
Exchange rate as of closing date of period (per USD) | $ / € | 1,073.18 | 893.45 | 189.08
Appreciation due to inflation (in percentage) | 0.80 |  |
Valuation assumption, revenue growth rate (in percentage) | 8.80% |  |
EBITDA margin (as a percent) | 20.40% |  |
Long-term capital expenditure (CapEx) ratio (as a percent) | 10.90% |  |
After-tax discount rates applied to cash flow projections (as a percent) | 17.00% |  |
Before-tax discount rates applied to cash flow projections (as a percent) | 25.00% |  |
Growth rate used to extrapolate cash flow projections (as a percent) | 3.00% |  |
Inflation adjustments | € 436 |  |
Inflation adjust-ments | 838 |  |
Deferred tax assets | 446 |  |
Net assets | 1,175 | € 1,149 |
Revenues | 2,226 | 1,237 |
Operating income (loss) | € 84 | € 199 |

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