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Tax Matters - Main Changes Narrative (Details)
€ in Millions
 12 Months Ended
Dec. 27, 2023
EUR (€)
Sep. 27, 2023
EUR (€)
Dec. 31, 2024
EUR (€)
company
Dec. 31, 2023
EUR (€)
company
Dec. 31, 2022
EUR (€)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Number of consolidated tax group companies | company     47 45  
Increase/(decrease) in tax expense arising from temporary differences     € 599 € 11 € 43
Deferred tax assets     6,673 6,240 4,884
Deferred tax liabilities     2,905 2,702 3,067
Corporate income tax     (348) 899 € (641)
Peru          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Reversal of deferred tax assets     91    
Telefónica Argentina          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Disposal of tax liability     332    
Addition deferred tax asset     141    
Telefónica Germany          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Tax credits recognized     127    
Applied tax loss carryforwards     60 41  
Tax liabilities additions     40    
Disposal of tax liability       18  
Adjustments for current tax of prior periods     127 115  
Group 3G UMTS Holding GmbH Holding Company          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Tax credits recognized     106 73  
Applied tax loss carryforwards     83 79  
Telefónica Brazil          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Disposal of deferred tax assets     4 61  
Applied tax loss carryforwards     65 60  
Deferred tax assets     3 23  
Deferred tax liabilities     178 119  
Disposal of tax liability     140 266  
Telefonica Chile          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Disposal of deferred tax assets     38 18  
Deferred tax assets     70 94  
Deferred tax liabilities     8 48  
Disposal of tax liability     24 28  
Telefonica Colombia          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Disposal of deferred tax assets     11 66  
Deferred tax assets     45 9  
Disposal of tax liability       13  
Subsidiaries          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred tax liabilities     156 258  
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised     330 233  
Deferred tax liabilities          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Increase/(decrease) in tax expense arising from temporary differences     535    
Deferred tax relating to items credited (charged) directly to equity     (29) (2)  
Deferred tax assets          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Increase/(decrease) in tax expense arising from temporary differences     410    
Deferred tax relating to items credited (charged) directly to equity     115 194  
Telefónica Spain          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Increase (decrease) through restructuring, deferred tax liability (asset)     78 412  
Disposal of deferred tax assets     255 208  
Deferred tax assets, temporary difference € 306   218    
Tax credits recognized   € 334 € 334    
Increase (decrease) in deferred tax liability (asset)       541  
Corporate income tax       € 541