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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