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Goodwill - Narrative (Details) € in Millions | 12 Months Ended | 36 Months Ended
--- | --- | ---
Dec. 31, 2024 EUR (€) cGU | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 EUR (€) | Dec. 31, 2025
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Goodwill impairment (Note 7) | € 866 | € 58 | € 0 |
Impairment loss recognised in profit or loss, intangible assets other than goodwill | € 506 | € 2 |  |
Business plan, term | 3 years |  |  |
Business plan, cash flow, term | 5 years |  |  |
Number of cash generating units | cGU | 3 |  |  |
Fiber optic assets in Peru |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Goodwill impairment (Note 7) | € 34 |  |  |
Telefonica Tech UK & Ireland, Limited |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Goodwill impairment (Note 7) | € 192 |  |  |
Growth rate used to extrapolate cash flow projections (as a percent) | 3.00% |  |  |
Telefonica Tech UK & Ireland, Limited | Weighted Average Cost of Capital (WACC) |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate | (0.50%) |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill | € 28 |  |  |
Telefonica Tech UK & Ireland, Limited | Perpetuity growth rates |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate | 0.25% |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill | € 12 |  |  |
Telefonica Tech UK & Ireland, Limited | Long-term margin of operating results before depreciation and amortization |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate | 0.50% |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill | € 19 |  |  |
Telefonica Tech UK & Ireland, Limited | Investment/Sales Ratio |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate | (0.25%) |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill | € 9 |  |  |
BE-terna |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Goodwill impairment (Note 7) | € 51 |  |  |
Telefónica Germany |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
After-tax discount rates applied to cash flow projections (as a percent) | 5.50% | 5.80% |  |
Before-tax discount rates applied to cash flow projections (as a percent) | 8.00% | 8.40% |  |
Growth rate used to extrapolate cash flow projections (as a percent) | 1.00% | 1.00% |  |
EBITDA margin estimate, term | 2 years |  |  |
Telefónica Germany | Minimum |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Long-term capital expenditure (CapEx) ratio (as a percent) | 11.00% |  |  |
Telefónica Germany | Minimum | Perpetuity growth rates |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate |  | 0.25% |  |
Telefónica Germany | Minimum | Long-term margin of operating results before depreciation and amortization |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate |  | 1.50% |  |
Telefónica Germany | Maximum |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Long-term capital expenditure (CapEx) ratio (as a percent) | 17.00% |  |  |
Telefónica Germany | Maximum | Perpetuity growth rates |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate |  | (0.25%) |  |
Telefónica Germany | Maximum | Long-term margin of operating results before depreciation and amortization |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate |  | (1.50%) |  |
Telefónica Germany | Forecast | Minimum |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
EBITDA margin (as a percent) |  |  |  | 27.00%
Telefónica Germany | Forecast | Maximum |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
EBITDA margin (as a percent) |  |  |  | 31.00%
Telefónica Spain |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
After-tax discount rates applied to cash flow projections (as a percent) | 6.60% | 7.00% |  |
Before-tax discount rates applied to cash flow projections (as a percent) | 8.60% | 9.10% |  |
Growth rate used to extrapolate cash flow projections (as a percent) | 0.80% | 0.80% |  |
EBITDA margin estimate, term | 2 years |  |  |
Telefónica Spain | Minimum |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Long-term capital expenditure (CapEx) ratio (as a percent) | 10.00% |  |  |
Telefónica Spain | Minimum | Perpetuity growth rates |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate |  | 0.25% |  |
Telefónica Spain | Minimum | Long-term margin of operating results before depreciation and amortization |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate |  | 1.75% |  |
Telefónica Spain | Maximum |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Long-term capital expenditure (CapEx) ratio (as a percent) | 12.00% |  |  |
Telefónica Spain | Maximum | Perpetuity growth rates |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate |  | (0.25%) |  |
Telefónica Spain | Maximum | Long-term margin of operating results before depreciation and amortization |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate |  | (1.75%) |  |
Telefónica Spain | Forecast | Minimum |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
EBITDA margin (as a percent) |  |  |  | 35.00%
Telefónica Spain | Forecast | Maximum |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
EBITDA margin (as a percent) |  |  |  | 38.00%
Telefónica Brazil |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
After-tax discount rates applied to cash flow projections (as a percent) | 11.50% | 12.00% |  |
Before-tax discount rates applied to cash flow projections (as a percent) | 13.90% | 14.80% |  |
Growth rate used to extrapolate cash flow projections (as a percent) | 4.00% | 4.00% |  |
EBITDA margin estimate, term | 2 years |  |  |
Telefónica Brazil | Minimum | Perpetuity growth rates |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate |  | 0.50% |  |
Telefónica Brazil | Minimum | Long-term margin of operating results before depreciation and amortization |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate |  | 2.00% |  |
Telefónica Brazil | Maximum | Perpetuity growth rates |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate |  | (0.50%) |  |
Telefónica Brazil | Maximum | Long-term margin of operating results before depreciation and amortization |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate |  | (2.00%) |  |
Telefónica Brazil | Forecast | Minimum |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
EBITDA margin (as a percent) |  |  |  | 41.00%
Long-term capital expenditure (CapEx) ratio (as a percent) | 10.00% |  |  |
Telefónica Brazil | Forecast | Maximum |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
EBITDA margin (as a percent) |  |  |  | 44.00%
Long-term capital expenditure (CapEx) ratio (as a percent) | 16.00% |  |  |
Peru |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Goodwill impairment (Note 7) | € 226 |  |  |
Peru | Fiber optic assets in Peru |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Goodwill impairment (Note 7) | 34 |  |  |
Impairment loss recognised in profit or loss, intangible assets other than goodwill | 54 |  |  |
Peru | Telefónica Hispam |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Goodwill impairment (Note 7) | € 226 |  |  |
After-tax discount rates applied to cash flow projections (as a percent) | 9.50% |  |  |
Before-tax discount rates applied to cash flow projections (as a percent) | 11.60% |  |  |
Growth rate used to extrapolate cash flow projections (as a percent) | 2.40% |  |  |
Chile |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Growth rate used to extrapolate cash flow projections (as a percent) | 2.80% |  |  |
Chile | Weighted Average Cost of Capital (WACC) |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate | (0.50%) |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill | € 107 |  |  |
Chile | Perpetuity growth rates |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate | 0.25% |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill | € 48 |  |  |
Chile | Long-term margin of operating results before depreciation and amortization |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate | 1.25% |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill | € 198 |  |  |
Chile | Investment/Sales Ratio |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Sensitivity analysis, basis spread on variable rate | (0.60%) |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill | € 136 |  |  |
Chile | Telefónica Hispam |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Goodwill impairment (Note 7) | € 397 |  |  |
After-tax discount rates applied to cash flow projections (as a percent) | 8.50% |  |  |
Before-tax discount rates applied to cash flow projections (as a percent) | 10.40% |  |  |
Growth rate used to extrapolate cash flow projections (as a percent) | 2.80% |  |  |
United Kingdom | Telefonica Tech UK & Ireland, Limited |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Goodwill impairment (Note 7) | € 192 |  |  |
After-tax discount rates applied to cash flow projections (as a percent) | 9.40% |  |  |
Before-tax discount rates applied to cash flow projections (as a percent) | 11.40% |  |  |
United Kingdom | BE-terna |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Goodwill impairment (Note 7) | € 51 |  |  |
Ecuador | Telefónica Hispam |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Goodwill impairment (Note 7) |  | € 58 |  |

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