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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