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Goodwill - Narrative (Details) - EUR (€) € in Millions |  |  | 12 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 09, 2022 | Mar. 21, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2023 | Jul. 31, 2021 | Jul. 01, 2021
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Business plan, term |  |  | 3 years |  |  |  |
Business plan, cash flow, term |  |  | 5 years |  |  |  |
Telefónica Spain |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
OIBDA margin estimate, term |  |  | 2 years |  |  |  |
Long-term capital expenditure (CapEx) ratio (as a percent) |  |  | 12.00% |  |  |  |
Growth rate used to extrapolate cash flow projections (as a percent) |  |  | 0.80% | 0.80% |  |  |
After-tax discount rates applied to cash flow projections (as a percent) |  |  | 6.90% | 6.50% |  |  |
Telefónica Spain | Minimum | Perpetuity growth rates |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  |  | (0.25%) |  |  |
Telefónica Spain | Minimum | OIBDA Margin |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  |  | (1.50%) |  |  |
Telefónica Spain | Maximum | Perpetuity growth rates |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  |  | 0.25% |  |  |
Telefónica Spain | Maximum | OIBDA Margin |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  |  | 1.50% |  |  |
Telefónica Spain | Forecast | Minimum |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
OIBDA margin (as a percent) |  |  |  |  | 34.00% |  |
Telefónica Spain | Forecast | Maximum |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
OIBDA margin (as a percent) |  |  |  |  | 39.00% |  |
Telefónica Germany |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
OIBDA margin estimate, term |  |  | 2 years |  |  |  |
Growth rate used to extrapolate cash flow projections (as a percent) |  |  | 1.00% | 1.10% |  |  |
After-tax discount rates applied to cash flow projections (as a percent) |  |  | 5.70% | 5.20% |  |  |
Telefónica Germany | Minimum | Perpetuity growth rates |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  |  | (0.25%) |  |  |
Telefónica Germany | Minimum | OIBDA Margin |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  |  | (1.50%) |  |  |
Telefónica Germany | Maximum | Perpetuity growth rates |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  |  | 0.25% |  |  |
Telefónica Germany | Maximum | OIBDA Margin |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  |  | 1.50% |  |  |
Telefónica Germany | Forecast | Minimum |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
OIBDA margin (as a percent) |  |  |  |  | 30.00% |  |
Telefónica Germany | Forecast | Maximum |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
OIBDA margin (as a percent) |  |  |  |  | 33.00% |  |
Telefónica Germany and Telefónica United Kingdom |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Long-term capital expenditure (CapEx) ratio (as a percent) |  |  | 14.00% |  |  |  |
Telefónica Brazil |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
OIBDA margin estimate, term |  |  | 2 years |  |  |  |
Growth rate used to extrapolate cash flow projections (as a percent) |  |  | 4.50% | 4.50% |  |  |
After-tax discount rates applied to cash flow projections (as a percent) |  |  | 12.60% | 12.00% |  |  |
Telefónica Brazil | GDP Growth Rate |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Growth rate used to extrapolate cash flow projections (as a percent) |  |  | 5.50% |  |  |  |
Telefónica Brazil | Minimum |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Growth rate used to extrapolate cash flow projections (as a percent) |  |  | 1.50% |  |  |  |
Telefónica Brazil | Minimum | Perpetuity growth rates |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  |  | (0.50%) |  |  |
Telefónica Brazil | Minimum | OIBDA Margin |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  |  | (2.00%) |  |  |
Telefónica Brazil | Maximum |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Growth rate used to extrapolate cash flow projections (as a percent) |  |  | 4.50% |  |  |  |
Telefónica Brazil | Maximum | Perpetuity growth rates |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  |  | 0.50% |  |  |
Telefónica Brazil | Maximum | OIBDA Margin |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  |  | 2.00% |  |  |
Telefónica Brazil | Forecast | Minimum |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
OIBDA margin (as a percent) |  |  |  |  | 41.00% |  |
Long-term capital expenditure (CapEx) ratio (as a percent) |  |  | 16.00% |  |  |  |
Telefónica Brazil | Forecast | Maximum |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
OIBDA margin (as a percent) |  |  |  |  | 46.00% |  |
Telefónica Peru |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Weighted average cost of capital (as a percent) |  |  | 10.40% |  |  |  |
Growth rate used to extrapolate cash flow projections (as a percent) |  |  | 2.40% |  |  |  |
Telefónica Peru | Weighted Average Cost of Capital (WACC) |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  | 1.00% |  |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill |  |  | € 160 |  |  |  |
Telefónica Peru | Terminal Growth Rate |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill |  |  | € 11 |  |  |  |
Telefónica Peru | Perpetuity growth rates |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  | (0.25%) |  |  |  |
Telefónica Peru | OIBDA Margin |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  | (1.00%) |  |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill |  |  | € 95 |  |  |  |
Telefónica Peru | Investment/Sales Ratio |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  | 0.50% |  |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill |  |  | € 60 |  |  |  |
InfraCo, SpA |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Proportion of voting equity transferred (as a percent) |  |  |  |  |  | 60.00% |
InfraCo, SpA | Telefónica Chile, S.A. | KKR Alameda Aggregator L.P. |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Proportion of voting equity transferred (as a percent) |  |  |  | 60.00% |  |  | 60.00%
Telefonica Chile |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Growth rate used to extrapolate cash flow projections (as a percent) |  |  | 2.80% |  |  |  |
After-tax discount rates applied to cash flow projections (as a percent) |  |  | 9.40% |  |  |  |
Telefonica Chile | Weighted Average Cost of Capital (WACC) |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  | 0.50% |  |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill |  |  | € 60 |  |  |  |
Telefonica Chile | Perpetuity growth rates |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  | (0.25%) |  |  |  |
Telefonica Chile | OIBDA Margin |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  | (1.25%) |  |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill |  |  | € 116 |  |  |  |
Telefonica Chile | Investment/Sales Ratio |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  | 0.63% |  |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill |  |  | € 60 |  |  |  |
Telefonica Chile | Minimum |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Inflation rate (as a percent) |  |  | 10.00% |  |  |  |
Telefónica Ecuador |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Weighted average cost of capital (as a percent) |  |  | 16.00% |  |  |  |
Growth rate used to extrapolate cash flow projections (as a percent) |  |  | 2.00% |  |  |  |
Telefónica Ecuador | Weighted Average Cost of Capital (WACC) |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  | 15000.00% |  |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill |  |  | € 30 |  |  |  |
Telefónica Ecuador | Perpetuity growth rates |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  | (0.25%) |  |  |  |
Telefónica Ecuador | OIBDA Margin |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  | (1.75%) |  |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill |  |  | € 12 |  |  |  |
Telefónica Ecuador | Investment/Sales Ratio |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Change in key assumption rate (as a percent) |  |  | 0.90% |  |  |  |
Changes in key assumption rate, estimated additional impairment of goodwill |  |  | € 3 |  |  |  |
Goodwill |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Additions |  |  | 1,152 | € 297 |  |  |
Write-offs |  |  | 0 | (416) |  |  |
Disposals |  |  | 0 | 353 |  |  |
Goodwill | Operating segments | Telefónica Hispam |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Additions |  |  | 0 | 0 |  |  |
Write-offs |  |  | 0 | (393) |  |  |
Disposals |  |  | 0 | 137 |  |  |
Goodwill | Operating segments | Telefónica Spain |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Additions |  |  | 0 | 0 |  |  |
Write-offs |  |  | 0 | 0 |  |  |
Disposals |  |  | 0 | 8 |  |  |
Goodwill | Operating segments | Telefónica Germany |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Additions |  |  | 0 | 0 |  |  |
Write-offs |  |  | 0 | 0 |  |  |
Disposals |  |  | 0 | 172 |  |  |
Goodwill | Operating segments | Telefónica Brazil |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Additions |  |  | 695 | 0 |  |  |
Write-offs |  |  | 0 | 0 |  |  |
Disposals |  |  | € 0 | 36 |  |  |
Goodwill | Telefónica Peru |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Write-offs |  |  |  | (393) |  |  |
Goodwill | Telefónica Germany |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Disposals |  |  |  | 172 |  |  |
Goodwill | InfraCo, SpA | Telefónica Chile, S.A. | KKR Alameda Aggregator L.P. | Operating segments | Telefónica Hispam |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Write-offs |  |  |  | 137 |  |  |
Incremental | Goodwill |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Additions |  | € 170 |  |  |  |  |
BE-terna | Goodwill |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Additions | € 279 |  |  |  |  |  |
Cancom Ltd. | Goodwill |  |  |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |  |  |
Additions |  |  |  | € 284 |  |  |

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